这篇文章主要介绍了python开发之for循环操作,以实例形式较为详细的分析了Python中for循环的具体使用技巧,具有一定参考借鉴价值,需要的朋友可以参考下
本文实例讲述了python开发之for循环操作。分享给大家供大家参考,具体如下:
下面是我做的一些学习记录供大家参考:
- #基本的for循环语句
- test_list = [2,"Jone",3,6,7,'hongten','hanyuan','good',"Tom"]
- #打印列表的长度
- print(len(test_list))
- #遍历列表
- for i in test_list:
- print(i)
- test_str = "hello,i'm hongten"
- print('打印字符串:' + test_str)
- #遍历一个字符串
- print('遍历一个字符串')
- for i in test_str:
- print(i)
- test_tuple = [("a",1),("b",2),("c",3),("d",4)]
- print(test_tuple)
- #遍历一个元组
- print('遍历一个元组')
- for (i,j) in test_tuple:
- print(i,j)
- test_dict = {'name':'hongten','age':'20','gender':'M','sports':'足球,乒乓球,游泳'}
- #字典迭代器
- for key in test_dict:
- print(key + ':' + test_dict[key])
- L1 = [1,3,5,7]
- L2 = [2,4,6,8]
- #使用zip将两个列表合并
- print(zip(L1,L2))
- for (i,j) in zip(L1,L2):
- print(i,j)
- print('#######################################################')
- L3 = L2[:]
- L3.remove(8)
- print('L1,L3列表为:')
- print(L1)
- print(L3)
- for (i,j) in zip(L1,L3):
- print(i,j)
- #可以看出来当长度不一的时候,多余的被忽略
- test_keys = ['name','age','gender','weight','hight']
- test_values = ['Hongten','20','M','55','170']
- #使用zip来构造一个字典
- print('字典中的keys:')
- print(test_keys)
- print('字典中的key对应的value:')
- print(test_values)
- print('构造字典后')
- test_dic = dict(zip(test_keys,test_values))
- for key in test_dic:
- print( key + ':' + test_dic[key])
运行效果:
- Python 2.7.9 (default, Dec 10 2014, 12:24:55) [MSC v.1500 32 bit (Intel)] on win32
- Type "copyright", "credits" or "license()" for more information.
- >>> ================================ RESTART ================================
- >>>
- 9
- 2
- Jone
- 3
- 6
- 7
- hongten
- hanyuan
- good
- Tom
- 打印字符串:hello,i'm hongten
- 遍历一个字符串
- h
- e
- l
- l
- o
- ,
- i
- '
- m
- h
- o
- n
- g
- t
- e
- n
- [('a', 1), ('b', 2), ('c', 3), ('d', 4)]
- 遍历一个元组
- ('a', 1)
- ('b', 2)
- ('c', 3)
- ('d', 4)
- gender:M
- age:20
- name:hongten
- sports:足球,乒乓球,游泳
- [(1, 2), (3, 4), (5, 6), (7, 8)]
- (1, 2)
- (3, 4)
- (5, 6)
- (7, 8)
- #######################################################
- L1,L3列表为:
- [1, 3, 5, 7]
- [2, 4, 6]
- (1, 2)
- (3, 4)
- (5, 6)
- 字典中的keys:
- ['name', 'age', 'gender', 'weight', 'hight']
- 字典中的key对应的value:
- ['Hongten', '20', 'M', '55', '170']
- 构造字典后
- gender:M
- age:20
- name:Hongten
- weight:55
- hight:170
- >>>
希望本文所述对大家Python程序设计有所帮助。
新闻热点
疑难解答