python global关键字的用法详解

def a():
  ## 菊部变量 - ，-
  local = 1
  print(local)
## 全局无法使用，只有自己可用
print(lobal)

global_str = '123'
def a():
  ## 全菊变量 - ，-
  print(global_str)
## 全菊变量大家都可以用
print(global_str)

def out():
  ## 函数内变量，但对于下级函数就是全局变量，对于外部来说就是局部变量
  en = 1
  def inside():
    print(en)
    return en
  return inside()
out()

def out():
  ## global关键字作用
  global en
  en = 1
  ## 调用other可以打印en，去掉global会报错。
  other()
  print(out.__globals__)
def other():
  print(en)
out()

from report.a import *
out()
print(out.__globals__['en'])

1
1

from report.a import out
def b():
  print(out.__globals__['en'])
  ## 直接飙红了。 -，-
  print(en)
b()

Traceback (most recent call last):
 File "/Users/dangfuli/Documents/PycharmProjects/asp/report/b.py", line 9, in <module>
  b()
 File "/Users/dangfuli/Documents/PycharmProjects/asp/report/b.py", line 6, in b
  print(out.__globals__['en'])
KeyError: 'en'

def out():
  ## global关键字作用
  global en
  en = 1
  other()
  print(out.__globals__)
  ## 调用other可以打印en

def other():
  print(en)

out()

## 返回结果
{'__name__': '__main__', '__doc__': None, '__package__': None, '__loader__': <_frozen_importlib_external.SourceFileLoader object at 0x10306a7b8>, '__spec__': None, '__annotations__': {}, '__builtins__': <module 'builtins' (built-in)>, '__file__': '/Users/xxx/Documents/PycharmProjects/xxx/report/a.py', '__cached__': None, 'out': <function out at 0x101fcee18>, 'other': <function other at 0x1033f8c80>, 'en': 1}

# a.py
def out():
  ## global关键字作用
  global en
  en = 1
  other()
  print(out.__globals__['en'])
  ## 调用other可以打印en

def other():
  print(en)
#############上面是a文件，下面是b文件#############

# b.py
from report.a import out

def b():
  ## globals里面没有en那个全局变量
  out()
  print(b.__globals__['en'])

b()

1
Traceback (most recent call last):
 File "/Users/xxx/Documents/PycharmProjects/xxx/report/b.py", line 8, in <module>
  b()
 File "/Users/xxx/Documents/PycharmProjects/xxx/report/b.py", line 6, in b
  print(b.__globals__['en'])
KeyError: 'en'