srch

17.03.2022 · In Python, the special name __main__ is used for two important constructs:. the name of the top-level environment of the program, which can be checked using the __name__ == '__main__' expression; and. the __main__.py file in Python packages.. Both of these mechanisms are related to Python modules; how users interact with them and how they interact with each …

sys.stdlib_module_names¶ A frozenset of strings containing the names of standard library modules. It is the same on all platforms. Modules which are not available on some platforms and modules disabled at Python build are also listed. All module kinds are listed: pure Python, built-in, frozen and extension modules. Test modules are excluded.

Input and Output Using Sys

sys.dont_write_bytecode¶ If this is true, Python won’t try to write .pyc files on the import of source modules. This value is initially set to True or False depending on the -B command line option and the PYTHONDONTWRITEBYTECODE environment variable, but you can set it yourself to control bytecode file generation.. sys.pycache_prefix¶ If this is set (not None), Python will write …

19.09.2020 · sys.modules是一个全局字典，该字典是python启动后就加载在内存中。每当程序员导入新的模块，sys.modules都将记录这些模块。字典sys.modules对于加载模块起到了缓冲的作用。当某个模块第一次导入，字典sys.modules将自动记录该模块。

A tuple of strings containing the names of all modules that are compiled into this Python interpreter. (This information is not available in any other way — ...

07.08.2015 · When a module is invoked via Python’s -m option the module is bound to sys.modules['__main__'] and its .__name__ attribute is set to '__main__'. This enables the standard “main program” boilerplate code at the bottom of many modules, such as:

sys.modules is a dictionary containing all the modules that have ever been imported since Python was started; the key is the module name, the value is ...

Nov 22, 2020 · __name__ is a built-in variable which evaluates to the name of the current module. Thus it can be used to check whether the current script is being run on its own or being imported somewhere else by combining it with if statement, as shown below. Consider two separate files File1 and File2. print ("File1 __name__ = %s" %__name__)

1 >>> import os 1 Import os >>> dir ( os.path ) [ ' __all__ ' , ' -_builtins - _ ' , ' -__ doc__ ' , __doc__ ' . ' _file__ ' . -- name-' --package__ ' ...

tags: my-python sys modules. A way to get a handle to the current running module in Python: import sys. module = sys.modules [__name__] it really only works if you are doing the whole sys.modules litany in the very module you want to get a handle to. Therefore, the meaning of getattr (sys.modules [__ name_____], func_name) is to find an object ...

__name__ is a string containing the module name. Recall from the modules episode that modules are just Python files. Every module in Python has the special ...

Module's name is available as value to __name__ global variable. A module is a file containing Python definitions and statements. The file name ...

Mar 17, 2022 · When a Python module or package is imported, __name__ is set to the module’s name. Usually, this is the name of the Python file itself without the .py extension: >>> import configparser >>> configparser . __name__ 'configparser'

A module can define functions, classes, and variables. So when the interpreter runs a module, the __name__ variable will be set as __main__ if ...

Aug 07, 2015 · When a module is invoked via Python’s -m option the module is bound to sys.modules ['__main__'] and its .__name__ attribute is set to '__main__' . This enables the standard “main program” boilerplate code at the bottom of many modules, such as: if __name__ == '__main__': sys.exit(main(sys.argv)) However, when the above command line invocation is used it is a natural inference to presume that the module is actually imported under its official name module.name , and therefore that if the ...

This name is used to uniquely identify the module in the import system. https://docs.python.org/3/library/__main__.html#module-__main__ '__main__' is the ...

Jul 24, 2019 · I understand that sys.modules[__name__] tells you what module you are currently at, but this line of code at the end of his constant.py really confuses me. What is the meaning and the point of having such a statement that declares the current module by the end of the file?

22.11.2020 · Since there is no main () function in Python, when the command to run a python program is given to the interpreter, the code that is at level 0 indentation is to be executed. However, before doing that, it will define a few special variables. __name__ is one such special variable. If the source file is executed as the main program, the ...

23.07.2019 · Since in Python you don't have to put class definitions in separate files, I argue that I don't really need two modules unless I want to reuse the class "const." Then in this case sys.moldules[__name__]=_const() is not necessary either...

In the python REPL sys.modules['__main__'] refer to the built-in module ( <module '__main__' (built-in)> ) ...