Why Am I Getting 'TypeError: List Indices Must Be Integers or Slices, Not Str' When Merging Lists into a CSV?

TypeError: List Indices Must Be Integers or Slices, Not Str

In this error, you encounter an issue with your code that merges two lists into an array and writes it to a CSV file. The error message indicates that you are trying to index a list using a string, which is not allowed.

To fix this, follow the steps outlined in the provided solution:

1. Convert array_length to an integer. Instead of array_length = str(len(array_dates)), use array_length = len(array_dates).
2. Use a range function in your for loop. Instead of for i in array_length, use for i in range(array_length).
3. Remove the increment line i = 1 since it will automatically increment.

Alternative Approach Using Zip:

Instead of the method you used, you can take advantage of Python's zip function to combine the elements of the two lists into pairs, which can then be written directly to the CSV file.

import csv

dates = ['2020-01-01', '2020-01-02', '2020-01-03']
urls = ['www.abc.com', 'www.cnn.com', 'www.nbc.com']

csv_file_patch = '/path/to/filename.csv'

with open(csv_file_patch, 'w') as fout:
    csv_file = csv.writer(fout, delimiter=';', lineterminator='\n')
    result_array = zip(dates, urls)
    csv_file.writerows(result_array)

By implementing these changes, you can merge your lists and write the resulting array to the CSV file without encountering the TypeError.

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