matchexpression:casevalue1:# 执行某些操作casevalue2:# 执行某些操作casevalue3:# 执行某些操作...cas...
其基本语法如下：match expression: case pattern_1: # do something case pattern_2: ...
为测试修补对象—参见unittest.mock.patch函数。 上下文管理器接口由__enter__和__exit__方法组成。在with的顶部,Python 调用上下文管理器对象的__enter__方法。当with块完成或由于任何原因终止时,Python 调用上下文管理器对象的__exit__方法。 最常见的例子是确保文件对象会关闭。示例 18-1 是使用with关闭文件的...
我还使用pytest为一些较大的示例编写了单元测试——我发现它比标准库中的unittest模块更易于使用且功能更强大。你会发现,通过在操作系统的命令行 shell 中键入python3 -m doctest example_script.py或pytest,可以验证本书中大多数代码的正确性。示例代码仓库根目录下的pytest.ini配置确保 doctests 被pytest命令收集和...
Alternative entry point The entry point is only in the function_app.py file. However, you can reference functions within the project in function_app.py by using blueprints or by importing. Folder structure The recommended folder structure for a Python functions project looks like the following exa...
If even a single character doesn’t match it leads to test failures. When to Choose Doctest is a suitable option if you want to showcase code examples in your documentation to illustrate its usage. It can be chosen to ensure that the documentation stays accurate according to the code. It ...
It is used as an alternative incrementation operator, together with another one >>> a +=+ 1 >>> a >>> 44 💡 Explanation: This prank comes from Raymond Hettinger's tweet. The space invader operator is actually just a malformatted a -= (-1). Which is equivalent to a = a - (...
def process_command(command): match command.split(): case ["go", direction]: return f"Moving {direction}" case ["pick", "up", item]: return f"Picking up {item}" case ["quit"]: return "Quitting" case _: return "Unknown command"...
An alternative to using for is to code the iteration with a while loop. Consider these two snippets of Python code, which perform the same action: These while and for statements do the same thing. There are no Dumb Questions Q: Q: So...when iterating over a list, I should always use...
We then saw how to sort Unicode text correctly by leveraging the standard locale module—with some caveats—and an alternative that does not depend on tricky locale configurations: the external PyUCA package. Finally, we glanced at the Unicode database (a source of metadata about every character...