Writing List of Strings to Excel CSV File in Python

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.

Answers:

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Method 1

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)

Method 2

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

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

Method 3

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.

Method 4

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

All methods was sourced from stackoverflow.com or stackexchange.com, is licensed under cc by-sa 2.5, cc by-sa 3.0 and cc by-sa 4.0