python对常见数据类型的遍历解析

>>> a_str = "hello itcast">>> for char in a_str:...   print(char,end=' ')...h e l l o  i t c a s t

>>> a_list = [1, 2, 3, 4, 5]>>> for num in a_list:...   print(num,end=' ')...1 2 3 4 5

>>> a_turple = (1, 2, 3, 4, 5)>>> for num in a_turple:...   print(num,end=" ")1 2 3 4 5

>>> a_dict = {"name":"lxy","sex":"男","age":18}>>> for key in a_dict.keys():  print(key)  namesexage

>>> a_dict = {"name":"lxy","sex":"男","age":18}>>> for value in a_dict.values():  print(value)lxy男18>>> 

>>> a_dict = {"name":"lxy","sex":"男","age":18}>>> for key,value in a_dict.items():  print("key=%s,value=%s"%(key,value))  key=name,value=lxykey=sex,value=男key=age,value=18

>>> chars = ['a', 'b', 'c', 'd']>>> i = 0>>> for chr in chars:...   print("%d %s"%(i, chr))...   i += 1...0 a1 b2 c3 d

>>> chars = ['a', 'b', 'c', 'd']>>> for i, chr in enumerate(chars):  print(i,chr) 0 a1 b2 c3 d>>>