"""

作用域问题

Version: 0.1
Author: 骆昊
Date: 2018-03-05

"""


# 局部作用域
def foo1():
	a = 5


foo1()
# print(a)	# NameError

# 全局作用域
b = 10


def foo2():
	print(b)


foo2()


def foo3():
	b = 100		# 局部变量
	print(b)


foo3()
print(b)


def foo4():
	global b
	b = 200		# 全局变量
	print(b)


foo4()
print(b)
