set_index/reset_index,互为逆操作,前者是将已有的一列信息设置为标签列,而后者是将原标签列归为数据,并重置为默认数字标签 set_axis,设置标签列,一次只能设置一列信息,与rename功能相近,但接收参数为一个序列更改全部标签列信息(rename中是接收字典,允许只更改部分信息) rename_axis,重命名标签名,rename中也可实...
(3)集合:set 参考dict,故意实现很相似。 As seen in thesource codethe complexities for set difference s-t or s.difference(t) (set_difference()) and in-place set difference s.difference_update(t) (set_difference_update_internal()) are different! The first one is O(len(s)) (for every e...
def namedtuple( typename: str, field_names: Union[str, Iterable[str]], *, # rest of signature omitted 如您所见,field_names被注释为Union[str, Iterable[str]],就目前而言是可以的,但不足以捕捉所有可能的问题。在审查动态协议后,我们转向更明确的运行时类型检查形式:鹅式类型检查。鹅式类型检查抽象类...
参考 pygame.display.gl_set_attribute() 关于合法标志的列表。 pygame.display.gl_set_attribute()设置当前显示模式的 OpenGL 属性值。 gl_set_attribute(flag, value) -> None 当调用设置了 pygame.OPENGL 标志的 pygame.display.set_mode() 函数时,Pygame 会自动设置 OpenGL 的一些属性值,例如颜色和双缓冲区。
|= performs an in-place operation (原地运算符) between pairs of objects. In particular, between: sets: a union operation dicts: an update operation counters: a union (of multisets) operation numbers: a bitwise OR, binary operation In most cases, it is related to the | operator. See examp...
In the face of ambiguity, refuse the temptation to guess. There should be one—and preferably only one—obvious way to do it. Although that way may not be obvious at first unless you're Dutch. Nowisbetter than never. Although neverisoften better than *right* now. ...
Union,Dict,Tupleimportrandomdeffactor_test(factor_name:str):returndefhandle_result(res):dict_factor_res[res[0]]=res[1:]deferror_callback(e):print("Error callback:",e)defmain():random_sample=[]num_cores=os.cpu_count()withPool(processes=num_cores)aspool:# with下面这些任务都会被挂起,...
pygame.Rect.union_ip() — 原地将两个 Rect 对象合并 pygame.Rect.unionall() — 将多个 Rect 对象合并 pygame.Rect.unionall_ip() — 原地将多个 Rect 对象合并 pygame.Rect.fit() — 按照一定的宽高比调整 Rect 对象 pygame.Rect.normalize() — 翻转 Rect 对象(如果尺寸为负数) ...
genres=sorted(set.union(*genres_iter)) #我们从一个全零的dataframe开始构建指标dataframe dummies=pd.DataFrame(np.zeros((3,len(genres))),columns=genres) #迭代每一部电影并将dummies各行的项设置为1 for i,gen in enumerate(a.genres): dummies.loc[i,gen.split('|')]=1 ...
'bool' = True) -> 'FrameOrSeriesUnion'Concatenate pandas objects along a particular axis with optional set logicalong the other axes.Can also add a layer of hierarchical indexing on the concatenation axis,which may be useful if the labels are the same (or overlapping) onthe passed axis numb...