python-day8-循环补充

# msg='hello'
# msg=[1,2,3,4,5,6]
# msg=(1,2,3,4,5,6) # index=0
# while index < len(msg):
# print(msg[index])
# index+=1 # msg_dic={
# 'apple':10,
# 'tesla':1000000,
# 'mac':3000,
# 'lenovo':30000,
# 'chicken':10,
# } #无序,用索引就不适用了 # msg='hello'
# # msg=['a','b','c','d','e']
# msg=('a','b','c','d','e')
#
# for i in range(len(msg)):
# print(i,msg[i]) #不依赖索引的取值
# for item in msg_dic:
# print(item,msg_dic[item]) # msg='hello'
# msg=[1,2,3,4,5,6]
# msg=(1,2,3,4,5,6)
# for item in msg:
# print(item) #补充
#range:顾头不顾尾,默认从0开始
# print(type(range(1,2)))
# for i in range(10):
# print(i,type(i)) # for i in range(1,10,2):
# print(i,type(i)) # for i in range(10,1,-2):
# print(i) # for i in range(1,10,1):
# print(i) # for i in range(9,0,-1):
# print(i) #break
#continue # for i in range(10):
# if i == 4:
# # break
# continue
# print(i) #for+else
# for i in range(10):
# print(i)
# break
# else: # 最后执行,并且在没有被break打断的情况下才执行
# print('===>') # 作业:99乘法表
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