python开发之for循环操作实例详解

825次阅读  |  发布于5年以前

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。

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