Python中是否存在文件？

Question

Possible Duplicate:
Pythonic way to check if a file exists?

如何使用Python2.6检查文件是否存在？

如果文件存在，请运行exec redo.py。 如果文件不存在exec file start.py

文件为0kb，但名称为Xxx100926.csv

似乎是

 from os path import exists
 from __future__ import with_statement

    if exists('Xxx100926.csv'):
      from redo import main
      #execfile(u'C:\redo.py')
    else:
      from start import main
      #execfile(u'C:\start.py') 
      with open(Xxx100926.csv, 'a'): pass

 #and run main function
 main()

Answer 1

您可以将main函数放在redo.py和start.py中，然后

from os path import exists

if exists('Xxx100926.csv'):
  from redo import main
else:
  from start import main

#and run main function
main()