a = 199
b = 299
def foo():
global a
a = 1
b = 0
foo()
print(str(a)+","+str(b))
输出:
1,299
a = 199
b = 299
def foo():
global a
a = 1
b = 0
foo()
print(str(a)+","+str(b))
输出:
1,299
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