rfind(sub [,start [,end]]) -> int Return the highest index in S where substring sub is found, such that sub is contained within S[start:end]. Optional arguments start and end are interpreted as in slice notation
the return value is the same object. | | Method resolution order: | str | basestring | object | | Methods defined here: | | __add__(...) | x.__add__(y) <==> x+y | | __contains__(...) | x.__contains__(y) <==> y in x | | __eq__(...) | x.__eq__(y)...
Example of Out-of-Range Access: my_list = [10, 20, 30]print(my_list[3])# Attempt to access the fourth element In this example,my_listcontains three elements, so the highest valid positive index is 2 (my_list[2]). Attempting to accessmy_list[3]results in anIndexErrorbecause there ...
def rfind(self, sub, start=None, end=None): # real signature unknown; restored from __doc__ (返回字符串最后一次出现的位置(从右向左查询),如果没有匹配项则返回-1) """ S.rfind(sub[, start[, end]]) -> int Return the highest index in S where substring sub is found, such that sub...
索引值,可以指定索引范围来查找,查找不到会报错 def index(self, value start=None, stop=None): # real signature unknown; restored from __doc__ """ L.index(value, [start, [stop]]) -> integer -- return first index of value. Raises ValueError if the value is not present. """ return...
| L.index(value, [start, [stop]]) -> integer -- return first index of value. | Raises ValueError if the value is not present. | | insert(...) -- More -- 这里我们看到了关于 list 这个类,Python 提供的所有方法,可以直接调用,例如统计列表中单词 hello 的个数: >>>a="hello,world,...
value in cfg.IMAGE_PATHS.items(): if isinstance(value, list): images = [] for...
When using a generator, all of the values are generated on the fly. Functions become generators by using the yield keyword to return a value. The value that each yield returns is analogous to an element in a list or a set. In many situations, yield is used within a loop, automatically...
protocal:如果该项省略,则默认为0。如果为负值或HIGHEST_PROTOCOL,则使用最高的协议版本。 pickle.loads(string) 函数的功能:从string中读出序列化前的obj对象。 string:文件名称。 参数讲解 【注】 dump() 与 load() 相比 dumps() 和 loads() 还有另一种能力:dump()函数能一个接着一个地将几个对象序列化...
所以你可以写作Tuple[str, str],所以函数create_deck()返回值的类型就是 List[Tuple[str, str]].def create_deck(shuffle: bool = False) -> List[Tuple[str, str]]: """Create a new deck of 52 cards""" deck = [(s, r) for r in RANKS for s in SUITS] if shuffle: random.shuffle(deck...