一、元組的創建與轉換：
ages = (11, 22, 33, 44, 55) ages = tuple((11, 22, 33, 44, 55))
ages = tuple([]) # 字符串、列表、字典（默認是key）
- 元組基本上可以看成不可修改的列表
- tuple(iterable)，可以存放所有可迭代的數據類型
二、元組的不可變性
如：t = (17, 'Jesse', ('LinuxKernel', 'Python'), [17, 'Jesse'])
元組t中的元素數字17和字符串‘Jesse’以及元組('LinuxKernel', 'Python')本身屬於不可變元素，故其在元組中不可更新；但是其中包含的列表[17, 'Jesse']本身屬於可變元素，故：
>>> t = (17, 'Jesse', ('LinuxKernel', 'Python'), [17, 'Jesse']) >>> t (17, 'Jesse', ('LinuxKernel', 'Python'), [17, 'Jesse']) >>> t[0] = 18 Traceback (most recent call last): File "<stdin>", line 1, in <module> TypeError: 'tuple' object does not support item assignment >>> t[3] [17, 'Jesse'] >>> t[3][0] = 21 >>> t (17, 'Jesse', ('LinuxKernel', 'Python'), [21, 'Jesse'])
三、元組常用操作
#count(self,value) #功能：統計當前元組中某元素的個數 tup = (55,77,85,55,96,99,22,55,) tup.count(55) #返回結果：3 元素‘55’在元組tup中出現了3次 #index(self, value, start=None, stop=None) 功能：獲取元素在元組中的索引值,對於重復的元素,默認獲取從左起第一個元素的索引值 tup = (55,77,85,55,96,99,22,55,) tup.index(55) 返回結果：0 tup.index(85) 返回結果：2 tup.index(55,2,7) 返回結果：3
lass tuple(object): """ tuple() -> empty tuple tuple(iterable) -> tuple initialized from iterable's items If the argument is a tuple, the return value is the same object. """ def count(self, value): # real signature unknown; restored from __doc__ """ T.count(value) -> integer -- return number of occurrences of value """ return 0 def index(self, value, start=None, stop=None): # real signature unknown; restored from __doc__ """ T.index(value, [start, [stop]]) -> integer -- return first index of value. Raises ValueError if the value is not present. """ return 0 def __add__(self, y): # real signature unknown; restored from __doc__ """ x.__add__(y) <==> x+y """ pass def __contains__(self, y): # real signature unknown; restored from __doc__ """ x.__contains__(y) <==> y in x """ pass def __eq__(self, y): # real signature unknown; restored from __doc__ """ x.__eq__(y) <==> x==y """ pass def __getattribute__(self, name): # real signature unknown; restored from __doc__ """ x.__getattribute__('name') <==> x.name """ pass def __getitem__(self, y): # real signature unknown; restored from __doc__ """ x.__getitem__(y) <==> x[y] """ pass def __getnewargs__(self, *args, **kwargs): # real signature unknown pass def __getslice__(self, i, j): # real signature unknown; restored from __doc__ """ x.__getslice__(i, j) <==> x[i:j] Use of negative indices is not supported. """ pass def __ge__(self, y): # real signature unknown; restored from __doc__ """ x.__ge__(y) <==> x>=y """ pass def __gt__(self, y): # real signature unknown; restored from __doc__ """ x.__gt__(y) <==> x>y """ pass def __hash__(self): # real signature unknown; restored from __doc__ """ x.__hash__() <==> hash(x) """ pass def __init__(self, seq=()): # known special case of tuple.__init__ """ tuple() -> empty tuple tuple(iterable) -> tuple initialized from iterable's items If the argument is a tuple, the return value is the same object. # (copied from class doc) """ pass def __iter__(self): # real signature unknown; restored from __doc__ """ x.__iter__() <==> iter(x) """ pass def __len__(self): # real signature unknown; restored from __doc__ """ x.__len__() <==> len(x) """ pass def __le__(self, y): # real signature unknown; restored from __doc__ """ x.__le__(y) <==> x<=y """ pass def __lt__(self, y): # real signature unknown; restored from __doc__ """ x.__lt__(y) <==> x<y """ pass def __mul__(self, n): # real signature unknown; restored from __doc__ """ x.__mul__(n) <==> x*n """ pass @staticmethod # known case of __new__ def __new__(S, *more): # real signature unknown; restored from __doc__ """ T.__new__(S, ...) -> a new object with type S, a subtype of T """ pass def __ne__(self, y): # real signature unknown; restored from __doc__ """ x.__ne__(y) <==> x!=y """ pass def __repr__(self): # real signature unknown; restored from __doc__ """ x.__repr__() <==> repr(x) """ pass def __rmul__(self, n): # real signature unknown; restored from __doc__ """ x.__rmul__(n) <==> n*x """ pass def __sizeof__(self): # real signature unknown; restored from __doc__ """ T.__sizeof__() -- size of T in memory, in bytes """ pass tuple