❮ Tham chiếu khung dữ liệu
Ví dụ
Trả về số phần tử trong DataFrame
nhập gấu trúc dưới dạng pd
df = pd. read_csv['dữ liệu. csv']
in [df. kích thước]
Tự mình thử »Định nghĩa và cách sử dụng
Thuộc tính
df.info[]
#
# RangeIndex: 891 entries, 0 to 890
# Data columns [total 12 columns]:
# PassengerId 891 non-null int64
# Survived 891 non-null int64
# Pclass 891 non-null int64
# Name 891 non-null object
# Sex 891 non-null object
# Age 714 non-null float64
# SibSp 891 non-null int64
# Parch 891 non-null int64
# Ticket 891 non-null object
# Fare 891 non-null float64
# Cabin 204 non-null object
# Embarked 889 non-null object
# dtypes: float64[2], int64[5], object[5]
# memory usage: 83.6+ KB
2 trả về số phần tử trong DataFrameSố phần tử là số hàng * số cột
Trong ví dụ của chúng tôi, DataFrame có 169 hàng và 4 cột. 169 * 4 = 676
cú pháp
Giá trị trả về
Một Int, đại diện cho số phần tử trong DataFrame
❮ Tham chiếu khung dữ liệu
Bài viết này mô tả cách lấy số hàng, số cột và tổng số phần tử [kích thước] của
df.info[]
#
# RangeIndex: 891 entries, 0 to 890
# Data columns [total 12 columns]:
# PassengerId 891 non-null int64
# Survived 891 non-null int64
# Pclass 891 non-null int64
# Name 891 non-null object
# Sex 891 non-null object
# Age 714 non-null float64
# SibSp 891 non-null int64
# Parch 891 non-null int64
# Ticket 891 non-null object
# Fare 891 non-null float64
# Cabin 204 non-null object
# Embarked 889 non-null object
# dtypes: float64[2], int64[5], object[5]
# memory usage: 83.6+ KB
0 và df.info[]
#
# RangeIndex: 891 entries, 0 to 890
# Data columns [total 12 columns]:
# PassengerId 891 non-null int64
# Survived 891 non-null int64
# Pclass 891 non-null int64
# Name 891 non-null object
# Sex 891 non-null object
# Age 714 non-null float64
# SibSp 891 non-null int64
# Parch 891 non-null int64
# Ticket 891 non-null object
# Fare 891 non-null float64
# Cabin 204 non-null object
# Embarked 889 non-null object
# dtypes: float64[2], int64[5], object[5]
# memory usage: 83.6+ KB
1
0df.info[] # # RangeIndex: 891 entries, 0 to 890 # Data columns [total 12 columns]: # PassengerId 891 non-null int64 # Survived 891 non-null int64 # Pclass 891 non-null int64 # Name 891 non-null object # Sex 891 non-null object # Age 714 non-null float64 # SibSp 891 non-null int64 # Parch 891 non-null int64 # Ticket 891 non-null object # Fare 891 non-null float64 # Cabin 204 non-null object # Embarked 889 non-null object # dtypes: float64[2], int64[5], object[5] # memory usage: 83.6+ KB
- Hiển thị số hàng, cột, v.v.
3df.info[] # # RangeIndex: 891 entries, 0 to 890 # Data columns [total 12 columns]: # PassengerId 891 non-null int64 # Survived 891 non-null int64 # Pclass 891 non-null int64 # Name 891 non-null object # Sex 891 non-null object # Age 714 non-null float64 # SibSp 891 non-null int64 # Parch 891 non-null int64 # Ticket 891 non-null object # Fare 891 non-null float64 # Cabin 204 non-null object # Embarked 889 non-null object # dtypes: float64[2], int64[5], object[5] # memory usage: 83.6+ KB
- Lấy số hàng.
4df.info[] # # RangeIndex: 891 entries, 0 to 890 # Data columns [total 12 columns]: # PassengerId 891 non-null int64 # Survived 891 non-null int64 # Pclass 891 non-null int64 # Name 891 non-null object # Sex 891 non-null object # Age 714 non-null float64 # SibSp 891 non-null int64 # Parch 891 non-null int64 # Ticket 891 non-null object # Fare 891 non-null float64 # Cabin 204 non-null object # Embarked 889 non-null object # dtypes: float64[2], int64[5], object[5] # memory usage: 83.6+ KB
- Lấy số cột.
5df.info[] # # RangeIndex: 891 entries, 0 to 890 # Data columns [total 12 columns]: # PassengerId 891 non-null int64 # Survived 891 non-null int64 # Pclass 891 non-null int64 # Name 891 non-null object # Sex 891 non-null object # Age 714 non-null float64 # SibSp 891 non-null int64 # Parch 891 non-null int64 # Ticket 891 non-null object # Fare 891 non-null float64 # Cabin 204 non-null object # Embarked 889 non-null object # dtypes: float64[2], int64[5], object[5] # memory usage: 83.6+ KB
- Lấy số hàng và số cột.
6df.info[] # # RangeIndex: 891 entries, 0 to 890 # Data columns [total 12 columns]: # PassengerId 891 non-null int64 # Survived 891 non-null int64 # Pclass 891 non-null int64 # Name 891 non-null object # Sex 891 non-null object # Age 714 non-null float64 # SibSp 891 non-null int64 # Parch 891 non-null int64 # Ticket 891 non-null object # Fare 891 non-null float64 # Cabin 204 non-null object # Embarked 889 non-null object # dtypes: float64[2], int64[5], object[5] # memory usage: 83.6+ KB
- Lấy số phần tử.
7df.info[] # # RangeIndex: 891 entries, 0 to 890 # Data columns [total 12 columns]: # PassengerId 891 non-null int64 # Survived 891 non-null int64 # Pclass 891 non-null int64 # Name 891 non-null object # Sex 891 non-null object # Age 714 non-null float64 # SibSp 891 non-null int64 # Parch 891 non-null int64 # Ticket 891 non-null object # Fare 891 non-null float64 # Cabin 204 non-null object # Embarked 889 non-null object # dtypes: float64[2], int64[5], object[5] # memory usage: 83.6+ KB
- Lưu ý khi chỉ định chỉ số
- Hiển thị số hàng, cột, v.v.
1df.info[] # # RangeIndex: 891 entries, 0 to 890 # Data columns [total 12 columns]: # PassengerId 891 non-null int64 # Survived 891 non-null int64 # Pclass 891 non-null int64 # Name 891 non-null object # Sex 891 non-null object # Age 714 non-null float64 # SibSp 891 non-null int64 # Parch 891 non-null int64 # Ticket 891 non-null object # Fare 891 non-null float64 # Cabin 204 non-null object # Embarked 889 non-null object # dtypes: float64[2], int64[5], object[5] # memory usage: 83.6+ KB
- Lấy số phần tử.
9,df.info[] # # RangeIndex: 891 entries, 0 to 890 # Data columns [total 12 columns]: # PassengerId 891 non-null int64 # Survived 891 non-null int64 # Pclass 891 non-null int64 # Name 891 non-null object # Sex 891 non-null object # Age 714 non-null float64 # SibSp 891 non-null int64 # Parch 891 non-null int64 # Ticket 891 non-null object # Fare 891 non-null float64 # Cabin 204 non-null object # Embarked 889 non-null object # dtypes: float64[2], int64[5], object[5] # memory usage: 83.6+ KB
00df.info[] # # RangeIndex: 891 entries, 0 to 890 # Data columns [total 12 columns]: # PassengerId 891 non-null int64 # Survived 891 non-null int64 # Pclass 891 non-null int64 # Name 891 non-null object # Sex 891 non-null object # Age 714 non-null float64 # SibSp 891 non-null int64 # Parch 891 non-null int64 # Ticket 891 non-null object # Fare 891 non-null float64 # Cabin 204 non-null object # Embarked 889 non-null object # dtypes: float64[2], int64[5], object[5] # memory usage: 83.6+ KB
- Lấy số phần tử.
Ví dụ, sử dụng dữ liệu người sống sót Titanic. Nó có thể được tải xuống từ Kaggle
df.info[]
#
# RangeIndex: 891 entries, 0 to 890
# Data columns [total 12 columns]:
# PassengerId 891 non-null int64
# Survived 891 non-null int64
# Pclass 891 non-null int64
# Name 891 non-null object
# Sex 891 non-null object
# Age 714 non-null float64
# SibSp 891 non-null int64
# Parch 891 non-null int64
# Ticket 891 non-null object
# Fare 891 non-null float64
# Cabin 204 non-null object
# Embarked 889 non-null object
# dtypes: float64[2], int64[5], object[5]
# memory usage: 83.6+ KB
1nguồn.
Liên kết được tài trợ
Lấy số hàng, số cột, số phần tử của df.info[]
#
# RangeIndex: 891 entries, 0 to 890
# Data columns [total 12 columns]:
# PassengerId 891 non-null int64
# Survived 891 non-null int64
# Pclass 891 non-null int64
# Name 891 non-null object
# Sex 891 non-null object
# Age 714 non-null float64
# SibSp 891 non-null int64
# Parch 891 non-null int64
# Ticket 891 non-null object
# Fare 891 non-null float64
# Cabin 204 non-null object
# Embarked 889 non-null object
# dtypes: float64[2], int64[5], object[5]
# memory usage: 83.6+ KB
0
df.info[]
#
# RangeIndex: 891 entries, 0 to 890
# Data columns [total 12 columns]:
# PassengerId 891 non-null int64
# Survived 891 non-null int64
# Pclass 891 non-null int64
# Name 891 non-null object
# Sex 891 non-null object
# Age 714 non-null float64
# SibSp 891 non-null int64
# Parch 891 non-null int64
# Ticket 891 non-null object
# Fare 891 non-null float64
# Cabin 204 non-null object
# Embarked 889 non-null object
# dtypes: float64[2], int64[5], object[5]
# memory usage: 83.6+ KB
Hiển thị số hàng, cột, v.v. df.info[]
#
# RangeIndex: 891 entries, 0 to 890
# Data columns [total 12 columns]:
# PassengerId 891 non-null int64
# Survived 891 non-null int64
# Pclass 891 non-null int64
# Name 891 non-null object
# Sex 891 non-null object
# Age 714 non-null float64
# SibSp 891 non-null int64
# Parch 891 non-null int64
# Ticket 891 non-null object
# Fare 891 non-null float64
# Cabin 204 non-null object
# Embarked 889 non-null object
# dtypes: float64[2], int64[5], object[5]
# memory usage: 83.6+ KB
3
df.info[]
#
# RangeIndex: 891 entries, 0 to 890
# Data columns [total 12 columns]:
# PassengerId 891 non-null int64
# Survived 891 non-null int64
# Pclass 891 non-null int64
# Name 891 non-null object
# Sex 891 non-null object
# Age 714 non-null float64
# SibSp 891 non-null int64
# Parch 891 non-null int64
# Ticket 891 non-null object
# Fare 891 non-null float64
# Cabin 204 non-null object
# Embarked 889 non-null object
# dtypes: float64[2], int64[5], object[5]
# memory usage: 83.6+ KB
Phương thức
df.info[]
#
# RangeIndex: 891 entries, 0 to 890
# Data columns [total 12 columns]:
# PassengerId 891 non-null int64
# Survived 891 non-null int64
# Pclass 891 non-null int64
# Name 891 non-null object
# Sex 891 non-null object
# Age 714 non-null float64
# SibSp 891 non-null int64
# Parch 891 non-null int64
# Ticket 891 non-null object
# Fare 891 non-null float64
# Cabin 204 non-null object
# Embarked 889 non-null object
# dtypes: float64[2], int64[5], object[5]
# memory usage: 83.6+ KB
03 của df.info[]
#
# RangeIndex: 891 entries, 0 to 890
# Data columns [total 12 columns]:
# PassengerId 891 non-null int64
# Survived 891 non-null int64
# Pclass 891 non-null int64
# Name 891 non-null object
# Sex 891 non-null object
# Age 714 non-null float64
# SibSp 891 non-null int64
# Parch 891 non-null int64
# Ticket 891 non-null object
# Fare 891 non-null float64
# Cabin 204 non-null object
# Embarked 889 non-null object
# dtypes: float64[2], int64[5], object[5]
# memory usage: 83.6+ KB
0 có thể hiển thị thông tin như số lượng hàng và cột, tổng mức sử dụng bộ nhớ, loại dữ liệu của từng cột và số lượng phần tử không phải NaNdf.info[]
#
# RangeIndex: 891 entries, 0 to 890
# Data columns [total 12 columns]:
# PassengerId 891 non-null int64
# Survived 891 non-null int64
# Pclass 891 non-null int64
# Name 891 non-null object
# Sex 891 non-null object
# Age 714 non-null float64
# SibSp 891 non-null int64
# Parch 891 non-null int64
# Ticket 891 non-null object
# Fare 891 non-null float64
# Cabin 204 non-null object
# Embarked 889 non-null object
# dtypes: float64[2], int64[5], object[5]
# memory usage: 83.6+ KB
nguồn.
Kết quả là đầu ra tiêu chuẩn và không thể lấy giá trị
Lấy số hàng. df.info[]
#
# RangeIndex: 891 entries, 0 to 890
# Data columns [total 12 columns]:
# PassengerId 891 non-null int64
# Survived 891 non-null int64
# Pclass 891 non-null int64
# Name 891 non-null object
# Sex 891 non-null object
# Age 714 non-null float64
# SibSp 891 non-null int64
# Parch 891 non-null int64
# Ticket 891 non-null object
# Fare 891 non-null float64
# Cabin 204 non-null object
# Embarked 889 non-null object
# dtypes: float64[2], int64[5], object[5]
# memory usage: 83.6+ KB
4
df.info[]
#
# RangeIndex: 891 entries, 0 to 890
# Data columns [total 12 columns]:
# PassengerId 891 non-null int64
# Survived 891 non-null int64
# Pclass 891 non-null int64
# Name 891 non-null object
# Sex 891 non-null object
# Age 714 non-null float64
# SibSp 891 non-null int64
# Parch 891 non-null int64
# Ticket 891 non-null object
# Fare 891 non-null float64
# Cabin 204 non-null object
# Embarked 889 non-null object
# dtypes: float64[2], int64[5], object[5]
# memory usage: 83.6+ KB
Số lượng hàng của
df.info[]
#
# RangeIndex: 891 entries, 0 to 890
# Data columns [total 12 columns]:
# PassengerId 891 non-null int64
# Survived 891 non-null int64
# Pclass 891 non-null int64
# Name 891 non-null object
# Sex 891 non-null object
# Age 714 non-null float64
# SibSp 891 non-null int64
# Parch 891 non-null int64
# Ticket 891 non-null object
# Fare 891 non-null float64
# Cabin 204 non-null object
# Embarked 889 non-null object
# dtypes: float64[2], int64[5], object[5]
# memory usage: 83.6+ KB
0 có thể thu được bằng hàm tích hợp Python df.info[]
#
# RangeIndex: 891 entries, 0 to 890
# Data columns [total 12 columns]:
# PassengerId 891 non-null int64
# Survived 891 non-null int64
# Pclass 891 non-null int64
# Name 891 non-null object
# Sex 891 non-null object
# Age 714 non-null float64
# SibSp 891 non-null int64
# Parch 891 non-null int64
# Ticket 891 non-null object
# Fare 891 non-null float64
# Cabin 204 non-null object
# Embarked 889 non-null object
# dtypes: float64[2], int64[5], object[5]
# memory usage: 83.6+ KB
07Trong ví dụ, nó được hiển thị bằng cách sử dụng
df.info[]
#
# RangeIndex: 891 entries, 0 to 890
# Data columns [total 12 columns]:
# PassengerId 891 non-null int64
# Survived 891 non-null int64
# Pclass 891 non-null int64
# Name 891 non-null object
# Sex 891 non-null object
# Age 714 non-null float64
# SibSp 891 non-null int64
# Parch 891 non-null int64
# Ticket 891 non-null object
# Fare 891 non-null float64
# Cabin 204 non-null object
# Embarked 889 non-null object
# dtypes: float64[2], int64[5], object[5]
# memory usage: 83.6+ KB
08, nhưng df.info[]
#
# RangeIndex: 891 entries, 0 to 890
# Data columns [total 12 columns]:
# PassengerId 891 non-null int64
# Survived 891 non-null int64
# Pclass 891 non-null int64
# Name 891 non-null object
# Sex 891 non-null object
# Age 714 non-null float64
# SibSp 891 non-null int64
# Parch 891 non-null int64
# Ticket 891 non-null object
# Fare 891 non-null float64
# Cabin 204 non-null object
# Embarked 889 non-null object
# dtypes: float64[2], int64[5], object[5]
# memory usage: 83.6+ KB
07 trả về một giá trị số nguyên, vì vậy nó có thể được gán cho một biến khác hoặc được sử dụng để tính toándf.info[]
#
# RangeIndex: 891 entries, 0 to 890
# Data columns [total 12 columns]:
# PassengerId 891 non-null int64
# Survived 891 non-null int64
# Pclass 891 non-null int64
# Name 891 non-null object
# Sex 891 non-null object
# Age 714 non-null float64
# SibSp 891 non-null int64
# Parch 891 non-null int64
# Ticket 891 non-null object
# Fare 891 non-null float64
# Cabin 204 non-null object
# Embarked 889 non-null object
# dtypes: float64[2], int64[5], object[5]
# memory usage: 83.6+ KB
0nguồn.
Lấy số cột. df.info[]
#
# RangeIndex: 891 entries, 0 to 890
# Data columns [total 12 columns]:
# PassengerId 891 non-null int64
# Survived 891 non-null int64
# Pclass 891 non-null int64
# Name 891 non-null object
# Sex 891 non-null object
# Age 714 non-null float64
# SibSp 891 non-null int64
# Parch 891 non-null int64
# Ticket 891 non-null object
# Fare 891 non-null float64
# Cabin 204 non-null object
# Embarked 889 non-null object
# dtypes: float64[2], int64[5], object[5]
# memory usage: 83.6+ KB
5
df.info[]
#
# RangeIndex: 891 entries, 0 to 890
# Data columns [total 12 columns]:
# PassengerId 891 non-null int64
# Survived 891 non-null int64
# Pclass 891 non-null int64
# Name 891 non-null object
# Sex 891 non-null object
# Age 714 non-null float64
# SibSp 891 non-null int64
# Parch 891 non-null int64
# Ticket 891 non-null object
# Fare 891 non-null float64
# Cabin 204 non-null object
# Embarked 889 non-null object
# dtypes: float64[2], int64[5], object[5]
# memory usage: 83.6+ KB
Số lượng cột của
df.info[]
#
# RangeIndex: 891 entries, 0 to 890
# Data columns [total 12 columns]:
# PassengerId 891 non-null int64
# Survived 891 non-null int64
# Pclass 891 non-null int64
# Name 891 non-null object
# Sex 891 non-null object
# Age 714 non-null float64
# SibSp 891 non-null int64
# Parch 891 non-null int64
# Ticket 891 non-null object
# Fare 891 non-null float64
# Cabin 204 non-null object
# Embarked 889 non-null object
# dtypes: float64[2], int64[5], object[5]
# memory usage: 83.6+ KB
0 có thể thu được bằng cách áp dụng df.info[]
#
# RangeIndex: 891 entries, 0 to 890
# Data columns [total 12 columns]:
# PassengerId 891 non-null int64
# Survived 891 non-null int64
# Pclass 891 non-null int64
# Name 891 non-null object
# Sex 891 non-null object
# Age 714 non-null float64
# SibSp 891 non-null int64
# Parch 891 non-null int64
# Ticket 891 non-null object
# Fare 891 non-null float64
# Cabin 204 non-null object
# Embarked 889 non-null object
# dtypes: float64[2], int64[5], object[5]
# memory usage: 83.6+ KB
07 cho thuộc tính df.info[]
#
# RangeIndex: 891 entries, 0 to 890
# Data columns [total 12 columns]:
# PassengerId 891 non-null int64
# Survived 891 non-null int64
# Pclass 891 non-null int64
# Name 891 non-null object
# Sex 891 non-null object
# Age 714 non-null float64
# SibSp 891 non-null int64
# Parch 891 non-null int64
# Ticket 891 non-null object
# Fare 891 non-null float64
# Cabin 204 non-null object
# Embarked 889 non-null object
# dtypes: float64[2], int64[5], object[5]
# memory usage: 83.6+ KB
63df.info[]
#
# RangeIndex: 891 entries, 0 to 890
# Data columns [total 12 columns]:
# PassengerId 891 non-null int64
# Survived 891 non-null int64
# Pclass 891 non-null int64
# Name 891 non-null object
# Sex 891 non-null object
# Age 714 non-null float64
# SibSp 891 non-null int64
# Parch 891 non-null int64
# Ticket 891 non-null object
# Fare 891 non-null float64
# Cabin 204 non-null object
# Embarked 889 non-null object
# dtypes: float64[2], int64[5], object[5]
# memory usage: 83.6+ KB
6nguồn.
Lấy số hàng và số cột. df.info[]
#
# RangeIndex: 891 entries, 0 to 890
# Data columns [total 12 columns]:
# PassengerId 891 non-null int64
# Survived 891 non-null int64
# Pclass 891 non-null int64
# Name 891 non-null object
# Sex 891 non-null object
# Age 714 non-null float64
# SibSp 891 non-null int64
# Parch 891 non-null int64
# Ticket 891 non-null object
# Fare 891 non-null float64
# Cabin 204 non-null object
# Embarked 889 non-null object
# dtypes: float64[2], int64[5], object[5]
# memory usage: 83.6+ KB
6
df.info[]
#
# RangeIndex: 891 entries, 0 to 890
# Data columns [total 12 columns]:
# PassengerId 891 non-null int64
# Survived 891 non-null int64
# Pclass 891 non-null int64
# Name 891 non-null object
# Sex 891 non-null object
# Age 714 non-null float64
# SibSp 891 non-null int64
# Parch 891 non-null int64
# Ticket 891 non-null object
# Fare 891 non-null float64
# Cabin 204 non-null object
# Embarked 889 non-null object
# dtypes: float64[2], int64[5], object[5]
# memory usage: 83.6+ KB
Thuộc tính
df.info[]
#
# RangeIndex: 891 entries, 0 to 890
# Data columns [total 12 columns]:
# PassengerId 891 non-null int64
# Survived 891 non-null int64
# Pclass 891 non-null int64
# Name 891 non-null object
# Sex 891 non-null object
# Age 714 non-null float64
# SibSp 891 non-null int64
# Parch 891 non-null int64
# Ticket 891 non-null object
# Fare 891 non-null float64
# Cabin 204 non-null object
# Embarked 889 non-null object
# dtypes: float64[2], int64[5], object[5]
# memory usage: 83.6+ KB
65 của df.info[]
#
# RangeIndex: 891 entries, 0 to 890
# Data columns [total 12 columns]:
# PassengerId 891 non-null int64
# Survived 891 non-null int64
# Pclass 891 non-null int64
# Name 891 non-null object
# Sex 891 non-null object
# Age 714 non-null float64
# SibSp 891 non-null int64
# Parch 891 non-null int64
# Ticket 891 non-null object
# Fare 891 non-null float64
# Cabin 204 non-null object
# Embarked 889 non-null object
# dtypes: float64[2], int64[5], object[5]
# memory usage: 83.6+ KB
0 lưu trữ số hàng và cột dưới dạng bộ dữ liệu df.info[]
#
# RangeIndex: 891 entries, 0 to 890
# Data columns [total 12 columns]:
# PassengerId 891 non-null int64
# Survived 891 non-null int64
# Pclass 891 non-null int64
# Name 891 non-null object
# Sex 891 non-null object
# Age 714 non-null float64
# SibSp 891 non-null int64
# Parch 891 non-null int64
# Ticket 891 non-null object
# Fare 891 non-null float64
# Cabin 204 non-null object
# Embarked 889 non-null object
# dtypes: float64[2], int64[5], object[5]
# memory usage: 83.6+ KB
67df.info[]
#
# RangeIndex: 891 entries, 0 to 890
# Data columns [total 12 columns]:
# PassengerId 891 non-null int64
# Survived 891 non-null int64
# Pclass 891 non-null int64
# Name 891 non-null object
# Sex 891 non-null object
# Age 714 non-null float64
# SibSp 891 non-null int64
# Parch 891 non-null int64
# Ticket 891 non-null object
# Fare 891 non-null float64
# Cabin 204 non-null object
# Embarked 889 non-null object
# dtypes: float64[2], int64[5], object[5]
# memory usage: 83.6+ KB
2nguồn.
Cũng có thể giải nén và lưu trữ chúng trong các biến riêng biệt
- Giải nén một bộ và liệt kê trong Python
df.info[]
#
# RangeIndex: 891 entries, 0 to 890
# Data columns [total 12 columns]:
# PassengerId 891 non-null int64
# Survived 891 non-null int64
# Pclass 891 non-null int64
# Name 891 non-null object
# Sex 891 non-null object
# Age 714 non-null float64
# SibSp 891 non-null int64
# Parch 891 non-null int64
# Ticket 891 non-null object
# Fare 891 non-null float64
# Cabin 204 non-null object
# Embarked 889 non-null object
# dtypes: float64[2], int64[5], object[5]
# memory usage: 83.6+ KB
3nguồn.
Lấy số phần tử. df.info[]
#
# RangeIndex: 891 entries, 0 to 890
# Data columns [total 12 columns]:
# PassengerId 891 non-null int64
# Survived 891 non-null int64
# Pclass 891 non-null int64
# Name 891 non-null object
# Sex 891 non-null object
# Age 714 non-null float64
# SibSp 891 non-null int64
# Parch 891 non-null int64
# Ticket 891 non-null object
# Fare 891 non-null float64
# Cabin 204 non-null object
# Embarked 889 non-null object
# dtypes: float64[2], int64[5], object[5]
# memory usage: 83.6+ KB
7
df.info[]
#
# RangeIndex: 891 entries, 0 to 890
# Data columns [total 12 columns]:
# PassengerId 891 non-null int64
# Survived 891 non-null int64
# Pclass 891 non-null int64
# Name 891 non-null object
# Sex 891 non-null object
# Age 714 non-null float64
# SibSp 891 non-null int64
# Parch 891 non-null int64
# Ticket 891 non-null object
# Fare 891 non-null float64
# Cabin 204 non-null object
# Embarked 889 non-null object
# dtypes: float64[2], int64[5], object[5]
# memory usage: 83.6+ KB
Tổng số phần tử của
df.info[]
#
# RangeIndex: 891 entries, 0 to 890
# Data columns [total 12 columns]:
# PassengerId 891 non-null int64
# Survived 891 non-null int64
# Pclass 891 non-null int64
# Name 891 non-null object
# Sex 891 non-null object
# Age 714 non-null float64
# SibSp 891 non-null int64
# Parch 891 non-null int64
# Ticket 891 non-null object
# Fare 891 non-null float64
# Cabin 204 non-null object
# Embarked 889 non-null object
# dtypes: float64[2], int64[5], object[5]
# memory usage: 83.6+ KB
0 được lưu trong thuộc tính df.info[]
#
# RangeIndex: 891 entries, 0 to 890
# Data columns [total 12 columns]:
# PassengerId 891 non-null int64
# Survived 891 non-null int64
# Pclass 891 non-null int64
# Name 891 non-null object
# Sex 891 non-null object
# Age 714 non-null float64
# SibSp 891 non-null int64
# Parch 891 non-null int64
# Ticket 891 non-null object
# Fare 891 non-null float64
# Cabin 204 non-null object
# Embarked 889 non-null object
# dtypes: float64[2], int64[5], object[5]
# memory usage: 83.6+ KB
20. Điều này bằng với df.info[]
#
# RangeIndex: 891 entries, 0 to 890
# Data columns [total 12 columns]:
# PassengerId 891 non-null int64
# Survived 891 non-null int64
# Pclass 891 non-null int64
# Name 891 non-null object
# Sex 891 non-null object
# Age 714 non-null float64
# SibSp 891 non-null int64
# Parch 891 non-null int64
# Ticket 891 non-null object
# Fare 891 non-null float64
# Cabin 204 non-null object
# Embarked 889 non-null object
# dtypes: float64[2], int64[5], object[5]
# memory usage: 83.6+ KB
21df.info[]
#
# RangeIndex: 891 entries, 0 to 890
# Data columns [total 12 columns]:
# PassengerId 891 non-null int64
# Survived 891 non-null int64
# Pclass 891 non-null int64
# Name 891 non-null object
# Sex 891 non-null object
# Age 714 non-null float64
# SibSp 891 non-null int64
# Parch 891 non-null int64
# Ticket 891 non-null object
# Fare 891 non-null float64
# Cabin 204 non-null object
# Embarked 889 non-null object
# dtypes: float64[2], int64[5], object[5]
# memory usage: 83.6+ KB
8nguồn.
Lưu ý khi chỉ định chỉ số
Khi một cột dữ liệu được chỉ định làm chỉ mục theo phương pháp
df.info[]
#
# RangeIndex: 891 entries, 0 to 890
# Data columns [total 12 columns]:
# PassengerId 891 non-null int64
# Survived 891 non-null int64
# Pclass 891 non-null int64
# Name 891 non-null object
# Sex 891 non-null object
# Age 714 non-null float64
# SibSp 891 non-null int64
# Parch 891 non-null int64
# Ticket 891 non-null object
# Fare 891 non-null float64
# Cabin 204 non-null object
# Embarked 889 non-null object
# dtypes: float64[2], int64[5], object[5]
# memory usage: 83.6+ KB
22, các cột này sẽ bị xóa khỏi phần thân dữ liệu [thuộc tính ______323], vì vậy nó không được tính là số lượng cộtdf.info[]
#
# RangeIndex: 891 entries, 0 to 890
# Data columns [total 12 columns]:
# PassengerId 891 non-null int64
# Survived 891 non-null int64
# Pclass 891 non-null int64
# Name 891 non-null object
# Sex 891 non-null object
# Age 714 non-null float64
# SibSp 891 non-null int64
# Parch 891 non-null int64
# Ticket 891 non-null object
# Fare 891 non-null float64
# Cabin 204 non-null object
# Embarked 889 non-null object
# dtypes: float64[2], int64[5], object[5]
# memory usage: 83.6+ KB
1nguồn.
Xem bài viết sau cho
df.info[]
#
# RangeIndex: 891 entries, 0 to 890
# Data columns [total 12 columns]:
# PassengerId 891 non-null int64
# Survived 891 non-null int64
# Pclass 891 non-null int64
# Name 891 non-null object
# Sex 891 non-null object
# Age 714 non-null float64
# SibSp 891 non-null int64
# Parch 891 non-null int64
# Ticket 891 non-null object
# Fare 891 non-null float64
# Cabin 204 non-null object
# Embarked 889 non-null object
# dtypes: float64[2], int64[5], object[5]
# memory usage: 83.6+ KB
22- gấu trúc. Gán cột hiện có cho chỉ mục DataFrame với set_index[]
Lấy số phần tử của df.info[]
#
# RangeIndex: 891 entries, 0 to 890
# Data columns [total 12 columns]:
# PassengerId 891 non-null int64
# Survived 891 non-null int64
# Pclass 891 non-null int64
# Name 891 non-null object
# Sex 891 non-null object
# Age 714 non-null float64
# SibSp 891 non-null int64
# Parch 891 non-null int64
# Ticket 891 non-null object
# Fare 891 non-null float64
# Cabin 204 non-null object
# Embarked 889 non-null object
# dtypes: float64[2], int64[5], object[5]
# memory usage: 83.6+ KB
1
df.info[]
#
# RangeIndex: 891 entries, 0 to 890
# Data columns [total 12 columns]:
# PassengerId 891 non-null int64
# Survived 891 non-null int64
# Pclass 891 non-null int64
# Name 891 non-null object
# Sex 891 non-null object
# Age 714 non-null float64
# SibSp 891 non-null int64
# Parch 891 non-null int64
# Ticket 891 non-null object
# Fare 891 non-null float64
# Cabin 204 non-null object
# Embarked 889 non-null object
# dtypes: float64[2], int64[5], object[5]
# memory usage: 83.6+ KB
Ví dụ về
df.info[]
#
# RangeIndex: 891 entries, 0 to 890
# Data columns [total 12 columns]:
# PassengerId 891 non-null int64
# Survived 891 non-null int64
# Pclass 891 non-null int64
# Name 891 non-null object
# Sex 891 non-null object
# Age 714 non-null float64
# SibSp 891 non-null int64
# Parch 891 non-null int64
# Ticket 891 non-null object
# Fare 891 non-null float64
# Cabin 204 non-null object
# Embarked 889 non-null object
# dtypes: float64[2], int64[5], object[5]
# memory usage: 83.6+ KB
1, chọn một hàng từ df.info[]
#
# RangeIndex: 891 entries, 0 to 890
# Data columns [total 12 columns]:
# PassengerId 891 non-null int64
# Survived 891 non-null int64
# Pclass 891 non-null int64
# Name 891 non-null object
# Sex 891 non-null object
# Age 714 non-null float64
# SibSp 891 non-null int64
# Parch 891 non-null int64
# Ticket 891 non-null object
# Fare 891 non-null float64
# Cabin 204 non-null object
# Embarked 889 non-null object
# dtypes: float64[2], int64[5], object[5]
# memory usage: 83.6+ KB
0df.info[]
#
# RangeIndex: 891 entries, 0 to 890
# Data columns [total 12 columns]:
# PassengerId 891 non-null int64
# Survived 891 non-null int64
# Pclass 891 non-null int64
# Name 891 non-null object
# Sex 891 non-null object
# Age 714 non-null float64
# SibSp 891 non-null int64
# Parch 891 non-null int64
# Ticket 891 non-null object
# Fare 891 non-null float64
# Cabin 204 non-null object
# Embarked 889 non-null object
# dtypes: float64[2], int64[5], object[5]
# memory usage: 83.6+ KB
6nguồn.
Lấy số phần tử. df.info[]
#
# RangeIndex: 891 entries, 0 to 890
# Data columns [total 12 columns]:
# PassengerId 891 non-null int64
# Survived 891 non-null int64
# Pclass 891 non-null int64
# Name 891 non-null object
# Sex 891 non-null object
# Age 714 non-null float64
# SibSp 891 non-null int64
# Parch 891 non-null int64
# Ticket 891 non-null object
# Fare 891 non-null float64
# Cabin 204 non-null object
# Embarked 889 non-null object
# dtypes: float64[2], int64[5], object[5]
# memory usage: 83.6+ KB
9, df.info[]
#
# RangeIndex: 891 entries, 0 to 890
# Data columns [total 12 columns]:
# PassengerId 891 non-null int64
# Survived 891 non-null int64
# Pclass 891 non-null int64
# Name 891 non-null object
# Sex 891 non-null object
# Age 714 non-null float64
# SibSp 891 non-null int64
# Parch 891 non-null int64
# Ticket 891 non-null object
# Fare 891 non-null float64
# Cabin 204 non-null object
# Embarked 889 non-null object
# dtypes: float64[2], int64[5], object[5]
# memory usage: 83.6+ KB
00
df.info[]
#
# RangeIndex: 891 entries, 0 to 890
# Data columns [total 12 columns]:
# PassengerId 891 non-null int64
# Survived 891 non-null int64
# Pclass 891 non-null int64
# Name 891 non-null object
# Sex 891 non-null object
# Age 714 non-null float64
# SibSp 891 non-null int64
# Parch 891 non-null int64
# Ticket 891 non-null object
# Fare 891 non-null float64
# Cabin 204 non-null object
# Embarked 889 non-null object
# dtypes: float64[2], int64[5], object[5]
# memory usage: 83.6+ KB
df.info[]
#
# RangeIndex: 891 entries, 0 to 890
# Data columns [total 12 columns]:
# PassengerId 891 non-null int64
# Survived 891 non-null int64
# Pclass 891 non-null int64
# Name 891 non-null object
# Sex 891 non-null object
# Age 714 non-null float64
# SibSp 891 non-null int64
# Parch 891 non-null int64
# Ticket 891 non-null object
# Fare 891 non-null float64
# Cabin 204 non-null object
# Embarked 889 non-null object
# dtypes: float64[2], int64[5], object[5]
# memory usage: 83.6+ KB
Vì
df.info[]
#
# RangeIndex: 891 entries, 0 to 890
# Data columns [total 12 columns]:
# PassengerId 891 non-null int64
# Survived 891 non-null int64
# Pclass 891 non-null int64
# Name 891 non-null object
# Sex 891 non-null object
# Age 714 non-null float64
# SibSp 891 non-null int64
# Parch 891 non-null int64
# Ticket 891 non-null object
# Fare 891 non-null float64
# Cabin 204 non-null object
# Embarked 889 non-null object
# dtypes: float64[2], int64[5], object[5]
# memory usage: 83.6+ KB
1 là một chiều, nên bạn có thể lấy tổng số phần tử [kích thước] bằng thuộc tính df.info[]
#
# RangeIndex: 891 entries, 0 to 890
# Data columns [total 12 columns]:
# PassengerId 891 non-null int64
# Survived 891 non-null int64
# Pclass 891 non-null int64
# Name 891 non-null object
# Sex 891 non-null object
# Age 714 non-null float64
# SibSp 891 non-null int64
# Parch 891 non-null int64
# Ticket 891 non-null object
# Fare 891 non-null float64
# Cabin 204 non-null object
# Embarked 889 non-null object
# dtypes: float64[2], int64[5], object[5]
# memory usage: 83.6+ KB
07 hoặc df.info[]
#
# RangeIndex: 891 entries, 0 to 890
# Data columns [total 12 columns]:
# PassengerId 891 non-null int64
# Survived 891 non-null int64
# Pclass 891 non-null int64
# Name 891 non-null object
# Sex 891 non-null object
# Age 714 non-null float64
# SibSp 891 non-null int64
# Parch 891 non-null int64
# Ticket 891 non-null object
# Fare 891 non-null float64
# Cabin 204 non-null object
# Embarked 889 non-null object
# dtypes: float64[2], int64[5], object[5]
# memory usage: 83.6+ KB
20