Python元组部分源码分析，元组和列表是可以相互转换的

1 def count(self, value): # real signature unknown; restored from __doc__
2         """ T.count(value) -> integer -- return number of occurrences of value """
3         return 0

1 练习1、统计元组中元素出现次数
2 aa = ("rhel",34,"fdsf","rhel","dsss",456,"rhel")
3 k = aa.count("rhel")      #计算元组中指定元素出现的个数
4 print(k)
5 #执行结果：
6 3

1 def index(self, value, start=None, stop=None): # real signature unknown; restored from __doc__
2         """
3         T.index(value, [start, [stop]]) -> integer -- return first index of value.
4         Raises ValueError if the value is not present.
5         """
6         return 0

1 #练习2、找出指定元素的索引位置
2 aa = ("rhel",34,"fdsf","rhel","dsss",456,"rhel")
3 k = aa.index("rhel")      #寻找指定元组元素的索引位置，有重复则输出最前面的索引位置
4 print(k)
5 #执行结果：
6 0

 1 #练习3、元组与列表的转换
 2 li = [11,22,33,"wer","are",]
 3 aa = ("rhel",34,"fdsf","rhel","dsss",456,"rhel")
 4 print(type(li))      #列表的类是list，列表的所有功能都在类里面
 5 print(type(aa))      #元组的类是tuple
 6 print(tuple(li))     #元组和列表是可以相互转换的
 7 print(list(aa))
 8 #执行结果：
 9 <class 'list'>
10 <class 'tuple'>
11 (11, 22, 33, 'wer', 'are')
12 ['rhel', 34, 'fdsf', 'rhel', 'dsss', 456, 'rhel']