Python list string to csv

I'm trying to create a csv file that contains the contents of a list of strings in Python, using the script below. However when I check my output file, it turns out that every character is delimited by a comma. How can I instruct csv.writer to delimit every individual string within the list rather than every character?

import csv

RESULTS = ['apple','cherry','orange','pineapple','strawberry']

result_file = open["output.csv",'wb']
wr = csv.writer[result_file, dialect='excel']
for item in RESULTS:
    wr.writerow[item]

I checked PEP 305 and couldn't find anything specific.

asked Aug 2, 2011 at 18:08

2

The csv.writer writerow method takes an iterable as an argument. Your result set has to be a list [rows] of lists [columns].

csvwriter.writerow[row]

Write the row parameter to the writer’s file object, formatted according to the current dialect.

Do either:

import csv
RESULTS = [
    ['apple','cherry','orange','pineapple','strawberry']
]
with open['output.csv','w'] as result_file:
    wr = csv.writer[result_file, dialect='excel']
    wr.writerows[RESULTS]

or:

import csv
RESULT = ['apple','cherry','orange','pineapple','strawberry']
with open['output.csv','w'] as result_file:
    wr = csv.writer[result_file, dialect='excel']
    wr.writerow[RESULT]

answered Aug 2, 2011 at 18:11

5

Very simple to fix, you just need to turn the parameter to writerow into a list.

for item in RESULTS:
    wr.writerow[[item]]

answered Aug 2, 2011 at 18:15

Mark RansomMark Ransom

290k40 gold badges384 silver badges607 bronze badges

I know I'm a little late, but something I found that works [and doesn't require using csv] is to write a for loop that writes to your file for every element in your list.

# Define Data
RESULTS = ['apple','cherry','orange','pineapple','strawberry']

# Open File
resultFyle = open["output.csv",'w']

# Write data to file
for r in RESULTS:
    resultFyle.write[r + "\n"]
resultFyle.close[]

I don't know if this solution is any better than the ones already offered, but it more closely reflects your original logic so I thought I'd share.

answered Sep 30, 2016 at 17:38

casscass

8181 gold badge10 silver badges16 bronze badges

1

A sample - write multiple rows with boolean column [using example above by GaretJax and Eran?].

import csv
RESULT = [['IsBerry','FruitName'],
          [False,'apple'],
          [True, 'cherry'],
          [False,'orange'],
          [False,'pineapple'],
          [True, 'strawberry']]
with open["../datasets/dashdb.csv", 'wb'] as resultFile:
    wr = csv.writer[resultFile, dialect='excel']
    wr.writerows[RESULT]

Result:

df_data_4 = pd.read_csv['../datasets/dashdb.csv']
df_data_4.head[]

Output:

   IsBerry  FruitName
   0    False   apple
   1    True    cherry
   2    False   orange
   3    False   pineapple
   4    True    strawberry

answered Feb 14, 2018 at 17:01

RaguRagu

313 bronze badges

How do I convert a string to a CSV file in Python?

How do I convert a list to a CSV file in Python?

How do I make a list into a csv file?

How do I write to column wise in a csv file in Python?