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# 练习高级特性的迭代

l = list(range(1,21))

# 这个就是迭代

for num in l:

print(num)

# 对元组的迭代

t = (1,3,5,7,9)

for num in t:

print(num)

# 还可以对字符串进行迭代

s = 'jskldf'

for c in s:

print(c)

# 判断一变量是否可迭代，用collections的Iterable

from collections import Iterable

print(isinstance(l,Iterable))

print(isinstance(t,Iterable))

print(isinstance(s,Iterable))

# 可以看出结果都是True，证明可迭代

# 还可以按下表来迭代

for value,num in enumerate(t):

print(value, num)

# 作业：请使用迭代查找一个list中最小和最大值，并返回一个tuple：

def getNum(L):

if isinstance(L,list):

max = min = L[0]

for num in L:

if num > max:

max = num

if num < min:

min = num

return (min, max)

else:

print('请输入一个列表')

l = [9,5,456,8,54,4,45]

print(getNum(l))