1.while循环
- while后面的条件是集合类型(list、tuple、dict、set)时,当集合中的元素个数为零时,判为false。
2.for循环
for item in sequence:
expressions
range函数
- range(start,stop) [start,stop)
- range(stop) [0,stop)
- range(start,stop,step) (start,start+step,start+2*step,...,start+n*step)
for item in sequence:
expressions