Question

我有一个名为myGlobal.py的python文件，在这个文件中我将count声明为全局变量。

import datetime
import time
import os

count = 0
failCount = 0

def counterstart:
    global count
    count +=1

我在另一个文件中调用此计数器。因此，每次调用函数时，我都希望计数器增加1.该文件为scripts.py

import os
from selenium import webdriver
import datetime
import time
from myGlobal import *

def main():
   fnfirst()
   fnsecond()
   fnthird()

def fnfirst(): 
    global count
    print count

def fnsecond(): 
    global count
    print count

def fnthird(): 
    global count
    print count

main()

但每当我运行script.py时，计数仅显示为0。

为什么会这样？

Answer 1

import myGlobal

print myGlobal.count # 0
myGlobal.count += 1

def foo():
    myGlobal.count += 1

foo()
print myGlobal.count # 2

所以这是一个基于Python的装饰器的解决方案。它将计算特定函数的调用次数：

# File script.py

import myGlobal

def count_call(func):
    def _wrapper(*args, **kwargs):
        myGlobal.count += 1
        func(*args, **kwargs)
    return _wrapper

@count_call
def fnfirst():
    pass # do something

@count_call
def fnsecond():
    pass # do something

def main():
    print myGlobal.count # 0
    fnfirst()
    print myGlobal.count # 1
    fnsecond()
    print myGlobal.count # 2
    fnfirst()
    print myGlobal.count # 3

if __name__ == "__main__":
    main()

计数值不增加

1 个答案: