Python跨模块中的全局变量

Question

I have two Python modules:

• one.py ; and
• two.py

I want to change X global variable in two.py .Script two.py running. After I run one.py

one.py

#!/usr/bin/env python

import two

def main():
 two.function("20")

if __name__=="__main__":
    main()

two.py

#!/usr/bin/env python

X="10"
def main():
 while True:
  function()
 time.sleep(0.25)

def function(input="00"):
 if(input!="00"):
      global X
      X=input
      print "change"

 print X
if __name__=="__main__":
  main()

console:

sudo python two.py

10
10
10
10

after I run one.py  but no change in two.py

Answer 1

after I run one.py but no change in two.py

What you're doing dynamically changes the variables. It doesn't re-write the files.

Which is in fact, what you might want to do.

myfile.txt

5

reader.py

with open('myfile.txt', 'r') as fp:
    nb = int(fp.read())
    print(nb)

writer.py

with open('myfile.txt', 'w') as fp:
    fp.write('6')

Now, if you run reader.py , it'll output 5 . Then if you run writer.py , it'll output nothing, just replace the entire content of myfile.txt with 6 . And then, rerun reader.py , it'll output 6 , because the content of the file as changed. It works because, unlike your program that you run, the files' content doesn't depend of a process, it's "static".