python - 错误: ValueError: invalid literal for int() with base 10: ''

Question

我在文件 build_ver.txt 中有值 1028，运行以下脚本时出现以下错误，脚本尝试将计数增加 1 并将值写回文件。.请建议如何克服此问题？

with open(r'\\Network\Build_ver\build_ver.txt','w+') as f:
    value = int(f.read())
    f.seek(0)
    f.write(str(value + 1))

错误:-

Traceback (most recent call last):
  File "build_ver.py", line 2, in <module>
    value = int(f.read())
ValueError: invalid literal for int() with base 10: ''

Answer 1

这就是在 w+ 模式下打开文件的作用:

w+
Open for reading and writing. The file is created if it does not exist, otherwise it is truncated. The stream is positioned at the beginning of the file.

强调我的。您的文件是空的，read() 将为您提供一个空字符串。

也许您想以 r+ 模式打开？