How to Export Multiple Python Lists to a Text File with Simple Code

Introduction

In a Python community a user asked how to save several lists with mixed numeric and string values into a txt file. The article shares multiple solutions.

Problem

Given lists such as lst_1 = ['a1', 2300, 1300] ... lst_5 = ['a6', 39000, 157, 'a8', 3000, 127], the goal is to write each list to a file, preferably only the list values without extra variable names.

Solution 1 – Direct write

with open('txtxtx.txt', 'a+', encoding='utf-8') as f:
    f.write(f"{['a1',2300,1300]}
")

This writes a single list; a loop can be added to handle all lists.

Solution 2 – Using globals() and eval

with open('test-18.txt', 'w+') as f:
    for key in list(globals()):
        if key.startswith("lst_"):
            f.write(f'{eval(key)}
')

This iterates over global variables whose names start with lst_ and writes their evaluated values.

Solution 3 – Simple loop with eval

data = ''
count = 6  # number of lists + 1
for i in range(1, count):
    s = eval(f'lst_{i}')
    data += f'{s}
'
with open('test-19.txt', 'w+', encoding='utf-8') as f:
    f.write(data)

This method builds a string of all list contents and writes it at once; it works when list names follow a regular pattern.

Conclusion

The article demonstrates three ways to export multiple Python lists to a text file, comparing their flexibility and suitability for different naming conventions.