Hướng dẫn how to find a specific word in a text file in python - cách tìm một từ cụ thể trong tệp văn bản bằng python

Xem thảo luận

Cải thiện bài viết

Lưu bài viết

Xem thảo luận

Cải thiện bài viết

Lưu bài viết

Đọc

Example:

string = "GEEK FOR GEEKS"

Input: "FOR" 
Output: Yes, FOR is present in the given string.

Bàn luận

myfile.txt

Trong bài viết này, chúng ta sẽ xem cách tìm kiếm một chuỗi trong các tệp văn bản bằng Python

Tệp văn bản để trình diễn:

Python3

with open

-1
-1
0
string exists in file
line Number: 4
-1
-1

-1
-1
0
string exists in file
line Number: 4
-1
-1

-1
-1
0
string exists in file
line Number: 4
-1
-1

-1
-1
0
string exists in file
line Number: 4
-1
-1

-1
-1
0
string exists in file
line Number: 4
-1
-1

Phương pháp 1: & nbsp; Tìm chỉ mục của chuỗi trong tệp văn bản bằng readline []

Trong phương thức này, chúng tôi đang sử dụng hàm readline [] và kiểm tra hàm find [], phương thức này trả về -1 nếu không tìm thấy giá trị và nếu thấy nó trả về 0.

-1
-1
0
string exists in file
line Number: 4
-1
-1

-1
-1
0
string exists in file
line Number: 4
-1
-1

-1
-1
0
string exists in file
line Number: 4
-1
-1

-1
-1
0
string exists in file
line Number: 4
-1
-1

-1
-1
0
string exists in file
line Number: 4
-1
-1

string does not exist

string does not exist

string does not exist

string does not exist

string does not exist in a file

string does not exist in a file

string does not exist in a file

string does not exist in a file

string does not exist in a file

MemTotal,5,2016-07-30 12:02:33,781
model name,3,2016-07-30 13:37:59,074
model,3,2016-07-30 15:39:59,075

string does not exist in a file

string does not exist in a file

MemTotal,5,2016-07-30 12:02:33,781
model name,3,2016-07-30 13:37:59,074
model,3,2016-07-30 15:39:59,075

MemTotal,5,2016-07-30 12:02:33,781
model name,3,2016-07-30 13:37:59,074
model,3,2016-07-30 15:39:59,075

Output:

-1
-1
0
string exists in file
line Number: 4
-1
-1

string does not exist

4

string does not exist

5

-1
-1
0
string exists in file
line Number: 4
-1
-1

7

string does not exist

7

string does not exist

string does not exist

string does not exist in a file

-1
-1
0
string exists in file
line Number: 4
-1
-1

-1
-1
0
string exists in file
line Number: 4
-1
-1

string does not exist in a file

string does not exist in a file

Python3

with open

-1
-1
0
string exists in file
line Number: 4
-1
-1

-1
-1
0
string exists in file
line Number: 4
-1
-1

-1
-1
0
string exists in file
line Number: 4
-1
-1

-1
-1
0
string exists in file
line Number: 4
-1
-1

term = "model"
file = open['file.txt']
for line in file:
    line.strip[].split['/n']
    if term in line:
        print line
file.close[]

term = "model"
file = open['file.txt']
for line in file:
    line.strip[].split['/n']
    if term in line:
        print line
file.close[]

string does not exist in a file

Phương pháp 2: Tìm chuỗi trong tệp văn bản bằng Read []

Chúng tôi sẽ tìm kiếm chuỗi từng dòng nếu chuỗi được tìm thấy thì chúng tôi sẽ in số chuỗi và số đó bằng hàm read [].

string does not exist in a file

string does not exist in a file

string does not exist in a file

model name,3,2016-07-30 13:37:59,074
model,3,2016-07-30 15:39:59,075

string does not exist in a file

string does not exist

 model,3,2016-07-30 15:39:59,075

string does not exist in a file

string does not exist in a file

string does not exist in a file

string does not exist in a file

 model,3,2016-07-30 15:39:59,075

string does not exist in a file

Output:

string does not exist

string does not exist

4

term = "model"
file = open['file.txt']
for line in file:
    line.strip[].split['/n']
    if term in line:
        print line
file.close[]

55

-1
-1
0
string exists in file
line Number: 4
-1
-1

7

term = "model"
file = open['file.txt']
for line in file:
    line.strip[].split['/n']
    if term in line:
        print line
file.close[]

2

term = "model"
file = open['file.txt']
for line in file:
    line.strip[].split['/n']
    if term in line:
        print line
file.close[]

8Search for a String in Text Files using enumerate[]

string does not exist

string does not exist

model name,3,2016-07-30 13:37:59,074
model,3,2016-07-30 15:39:59,075

string does not exist

model name,3,2016-07-30 13:37:59,074
model,3,2016-07-30 15:39:59,075

Python3

with open

-1
-1
0
string exists in file
line Number: 4
-1
-1

-1
-1
0
string exists in file
line Number: 4
-1
-1

-1
-1
0
string exists in file
line Number: 4
-1
-1

Phương pháp 3: Tìm kiếm một chuỗi trong các tệp văn bản bằng cách sử dụng Enumerate []

Chúng tôi chỉ tìm thấy chuỗi có mặt trong tệp hoặc không sử dụng Enumerate [] trong Python.

-1
-1
0
string exists in file
line Number: 4
-1
-1

string does not exist

string does not exist

string does not exist in a file

-1
-1
0
string exists in file
line Number: 4
-1
-1

-1
-1
0
string exists in file
line Number: 4
-1
-1

string does not exist in a file

string does not exist in a file

-1
-1
0
string exists in file
line Number: 4
-1
-1

string does not exist in a file

Output:

string does not exist in a file