Why Am I Getting a 'TypeError: list indices must be integers or slices, not str' Error When Merging Lists?

TypeError: List Indices Must Be Integers or Slices

When attempting to merge two lists into a single array, an "TypeError: list indices must be integers or slices, not str" error can occur. This error indicates that an attempt was made to access a list item using a non-integer value (i.e., a string).

In the code sample provided, the following adjustments are necessary to resolve this error:

• Convert array_length to an integer:

array_length = len(array_dates)

This line ensures that array_length contains an integer value representing the length of the array_dates list.

• Use range in the for loop:

for i in range(array_length):

The for loop should use the range function to iterate through array_dates. This will automatically increment i during each iteration.

• Remove the i = 1 line:

# Remove this line
# i += 1

Since i is automatically increased by range, the i = 1 line is unnecessary and should be removed.

Alternative Approach: Using zip Function

Alternatively, you can use the zip function to combine the two lists given that they have the same length:

import csv

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

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

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

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