Export Multiple Python Lists to a Text File with Simple Code

Introduction

Hello, I am a Python enthusiast. Recently a fan asked how to save several Python lists with mixed data types into a text file.

Problem Statement

The original lists are:

lst_1=['a1',2300,1300]
lst_2=['a2',24588,588,368]
lst_3=['a4',35000,387]
lst_4=['a5',35000]
lst_5=['a6',39000,157,'a8',3000,127]

Solution 1 (by 月神)

A simple approach writes a hard‑coded line to a file:

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

The result is close but not fully automated.

Solution 2 (by PI)

Another contribution attempted a direct copy‑paste method, but the execution produced errors and required further tweaking.

Solution 3 (by 瑜亮老师)

Two more robust methods are provided.

Method A – Iterate over global variables :

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

This writes each list’s content to the file, but also includes extra information that may need filtering.

Method B – Simple eval loop :

# method two: easy‑to‑understand version
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 version uses only the eval function and a straightforward loop, making it easier to understand but suitable only when list names follow a strict pattern.

Conclusion

The article demonstrates several ways to export multiple Python lists to a text file, highlighting the trade‑offs between flexibility and simplicity, and provides ready‑to‑run code snippets for readers to adapt to their own data‑export needs.