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for i in range(5):
print(i)
输出:0,1,2,3,4
默认从0开始
for i in range(1,5):
print(i)
输出:1,2,3,4
指定从1开始
for i in range(1,7,2):
print(i)
输出:1,3,5
第三个参数是步长