python开发之for循环操作实例详解

 #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]) 

 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 >>>