In general, a function takes arguments (if any), performs some operations, and returns a value (or object). The value that a function returns to the caller is generally known as the function’s return value. All
As well as using a function to abstract some code and give it a name, programmers typically want functions to return some calculated value, which the code that called the function can then work with. To support returning a value (or values) from a function, Python provides thereturnstatement...
下面的erDiagram展示了has_positive函数与 NumPy 数组之间的关系。 ARRAYintidfloatvalueFUNCTIONstringnamebooleanreturn_typeprocesses 在这个关系图中,我们可以看到FUNCTION(即has_positive函数) 与ARRAY(即 NumPy 数组) 之间的关系。 特殊情况处理 需要注意的是,还有一种情况需要额外处理。当您希望确认数组中的所有元素...
这是官方文档的一个例子,首先,该函数适用于二分类的交叉熵损失函数计算,其次对于predict参数,是需要经过sigmoid之后的,target是onehot编码格式的,因为target和predict的大小是一样的。如果是3D,那么predict和target的shape都应该是[B, Classes, D, H, W],如果是2D,那么它们的大小都应该是[B, Classes, H, W],...
One especially important use case is when you want to return more than one object from your Python function. 在这种情况下,您通常会将所有这些对象包装在一个元组对象中,然后返回该元组。 In that case, you would typically wrap all of those objects within a single tuple object, and then return th...
return result只是临时的;如“临时的丑陋的黑客:消息总线必须返回结果”中所述,这是一个临时的黑客,允许消息总线返回 API 使用的批次引用。我们将在第十二章中修复这个问题。 我们还将单个HANDLERS字典更改为命令和事件的不同字典。根据我们的约定,命令只能有一个处理程序: ...
Return Values To let a function return a value, use thereturnstatement: Example defmy_function(x): return5* x print(my_function(3)) print(my_function(5)) print(my_function(9)) Try it Yourself » The pass Statement functiondefinitions cannot be empty, but if you for some reason have...
from pandas import DataFrame isNa = DataFrame(isNA) """B:获取空值所在的行(对于所有列来说)""" #Return whether any element is True over #requested axis. #说白了,判断所有列,如果某一列存在一个true值,则该行返回true #如果全为false,则返回false df[isNa.any(axis = 1)] --- Out[9]: id ...
你可以通过输入代码并按Return(或Enter),运行任意Python语句。当你只输入一个变量,它会显示代表的对象: In [5]: import numpy as np In [6]: data = {i : np.random.randn() for i in range(7)} In [7]: data Out[7]: {0: -0.20470765948471295, 1: 0.47894333805754824, 2: -0.5194387150567381,...
numpy-使用and/or 还是使用 &/or---ValueError: The truth value of an array with more than one element is... 数组进行操作 and /or时,会报错ValueError:Thetruthvalueofan array with more than one elementisambiguous.Usea.any()ora.all() Python...