Python基础(迭代)
# from collections import Iterable#collections模块的Iterable类型判断 # dict1 = {'a':111,'b':222,'c':333} # print(dict1.keys())#dict_keys(['a', 'b', 'c']) # print(dict1.values())#dict_values([111, 222, 333]) # print(dict1.items())#dict_items([('a', 111), ('b', 222), ('c', 333)]) # for key,value in dict1.items(): # print(key,'---',value) # #a --- 111 # #b --- 222 # #c --- 333 # print(isinstance('abc',Iterable))#True str是否可迭代 # print(isinstance([1,2,3],Iterable))#True list是否可迭代 # print(isinstance(123,Iterable))#False 整数是否可迭代 # for i,item in enumerate(['a','b','c']):#list下标循环,内置的enumerate函数可以把一个list变成索引-元素对 # print(i,'---',item) # #0 --- a # #1 --- b # #2 --- c # for x,y in [(1,11),(2,22),(3,33)]: # print(x,'---',y) # #1 --- 11 # #2 --- 22 # #3 --- 33 arr = [1,2,3,4,5,6,1,3,9] def findMaxMin(arr): max = 0 min = 0 if not isinstance(arr,(list)): print('传入的不是list') return else: for i,item in enumerate(arr): if i == 0: min = item elif item < min: min = item elif item > max: max = item return (max,min) print(findMaxMin(arr))
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