在 python 3 中更改硬编码值 [英] Change hardcoded values in python 3

问题描述

我想更改代码中的硬编码值.我希望代码根据运行次数替换和更改硬编码值.开头:

I would like to change hardcoded values in my code. I would like the code to replace and change hardcoded values based on the number of times it runs. Beginning with:

x=1

下一次，在我运行它之后，在代码本身中，我想在代码编辑器中看到:

The next time, after I run it, in the code itself, I would like to see in the code editor:

x=2

它会在没有人工输入的情况下自动改变代码的值，所以第三次运行:

It will automatically change the values of the code without human input, so the third time its run:

x=3

这一切都是通过脚本运行完成的，没有任何人为交互.有没有简单的方法?

And this is all done just by the script running, no human interaction whatsoever. Is there an easy way?

推荐答案

你可以简单地写入一个定义良好的辅助文件:

You can simply write to a well-defined auxiliary file:

# define storage file path based on script path (__file__)
import os
counter_path = os.path.join(os.path.dirname(__file__), 'my_counter')
# start of script - read or initialise counter
try:
    with open(counter_path, 'r') as count_in:
        counter = int(count_in.read())
except FileNotFoundError:
    counter = 0

print('counter =', counter)

# end of script - write new counter
with open(counter_path, 'w') as count_out:
        count_out.write(str(counter + 1))

这将在您的脚本旁边存储一个辅助文件，其中包含逐字逐字的 counter.

This will store an auxiliary file next to your script, which contains the counter verbatim.

 $ python3 test.py
 counter = 0
 $ python3 test.py
 counter = 1
 $ python3 test.py
 counter = 2
 $ cat my_counter
 3

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