tuple内部方法

代码：

#tuple内部方法
ac=('a','r','6','d','a','b','b','e')
print(dir(ac))
print(ac.count('a'))
print(ac.index('b'))
print(ac.index('t'))

结果：

['__add__', '__class__', '__contains__', '__delattr__', '__dir__', '__doc__', '__eq__', '__format__', '__ge__', '__getattribute__', '__getitem__', '__getnewargs__', '__gt__', '__hash__', '__init__', '__iter__', '__le__', '__len__', '__lt__', '__mul__', '__ne__', '__new__', '__reduce__', '__reduce_ex__', '__repr__', '__rmul__', '__setattr__', '__sizeof__', '__str__', '__subclasshook__', 'count', 'index']
2
5
Traceback (most recent call last):
  File "Untitled 2.py", line 6, in <module>
    print(ac.index('t'))
ValueError: tuple.index(x): x not in tuple