Copy Each Line of a List into a Separate Text File

Question

I have two lists of equal length. One contains the names of the files I would like to create while the other is a 2-d list that has data I would like to copy into a text file with a name from the list. I want each element from the 2D list to have its own separate text file. The example code is as follows:

Source Code:

 example_data = [[1,2,3],[4,5,6],[7,8,9]]
    example_names = ['name1.txt', 'name2.txt', 'name3.txt']

    for name in example_names:
      for ele in example_data:
        with open(name, 'w') as f:
            f.writelines('0 ' + str(ele).replace('[',replace(']', '').replace(',', ''))

Current Output:

name1.txt,  
data within file: 0 7 8 9

name2.txt,  
data within file: 0 7 8 9

name3.txt,  
data within file: 0 7 8 9

Expected output:

name1.txt,  
data within file: 0 1 2 3

name2.txt,  
data within file: 0 4 5 6

name3.txt,  
data within file: 0 7 8 9

Asked By: user3434774

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Source

Answer 1

The problem is that you’re looping over all data for each file. Instead, you want to get only the data associated with that file. To do this, you can use enumerate() to get a list index. Also, you do not need f.writelines() because you’re only writing one line. Instead, use f.write(). Here’s the code you’re looking for:

data = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
files = ['f1.txt', 'f2.txt', 'f3.txt']

for i, file in enumerate(files):
    with open(file, 'w') as f:
        f.write('0 ' + str(data[i]).replace('[', '').replace(']', '').replace(',', ''))

Answered By: Michael M.

Answer 2

Logic

You can use zip to get both the element side by side and use str.join to convert list to str and as it’s list of int you need to convert every individual element to str type.

Solution

Source Code

example_data = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
example_names = ["name1.txt", "name2.txt", "name3.txt"]

for file_name, data in zip(example_names, example_data):
    with open(file_name, "w") as f:
        f.write(f"0 {' '.join([str(x) for x in data])}")

Output

name1.txt
0 1 2 3

name2.txt
0 4 5 6

name3.txt
0 7 8 9

Answered By: GodWin

Copy Each Line of a List into a Separate Text File

Question:

Answers:

Logic

Solution

Source Code

Output