Python第二天——循环

Posted 2020-08-30

字典循环
# dic={‘name‘:‘chras_lee‘,‘age‘:18}
# for i in dic.items():
#     print i,i[1]                  #一个变量循环字典

# dic={‘name‘:‘chras_lee‘,‘age‘:18}
# for i in enumerate(dic):
#     print (i,i[1],dic[i[1]])      #使用enumerate循环字典

# dic={‘name‘:‘chras_lee‘,‘age‘:18}
# for k,v in dic.items():
#     print (k,v)                   #两个变量循环字典
#
# dic={‘name‘:‘chras_lee‘,‘age‘:18}
# for k in dic.keys():
#     print (k,dic[k])              #使用dic.keys取value值
#
# dic={‘name‘:‘chras_lee‘,‘age‘:18}
# for v in dic.values():
#     print (v)                     #使用dic.values直接取出value值

# dic={‘name‘:‘chras_lee‘,‘age‘:18}
# for k in dic:
#     print (k,dic[k])                 #常用方法

#直接for循环字典就是遍历字典的key

循环字符串
# mes=‘hello‘
# for i in mes:
#     print (i)                 #for循环字符串

# mes=‘hello‘
# for i in enumerate(mes):
#     print i                    #使用enumerate将字符串以元组的方式遍历

# mes=‘hello‘
# for i in mes[::-1]:
#     print (i)                 #倒着循环

循环列表
# l=[‘a‘,‘b‘,‘c‘]
# for i in l:
#     print (i)                 #循环列表

# l=[‘a‘,‘b‘,‘c‘]
# for i in enumerate(l):
#     print (i)                 #使用enumerate将列表以元组的方式遍历
# 
# l = [‘a‘, ‘b‘, ‘c‘]
# for i in l[::-1]:
#     print (i)                 #倒着循环

循环元组
# t=(‘a‘,‘b‘,‘c‘)
# for i in t:
#     print (i)                 #循环元组
#
# t=(‘a‘,‘b‘,‘c‘)
# for i in enumerate(t:
#     print (i)                 #使用enumerate将元组以元组的方式遍历

# t=(‘a‘,‘b‘,‘c‘)
# for i in t[::-1]:
#     print (i)                 #倒着循环