i=0
n=0
def dummy():
i=0
print(i)
i+=1
def dummy2():
global n
print(n)
n+=1
print('函数内部的同名变量')
for j in range(20):
print(i)
dummy()
i+=1
print('global声明同名变量')
for k in range(20):
print(n)
dummy2()
n+=10
