- #Python execute file from txt write install
- #Python execute file from txt write code
- #Python execute file from txt write windows
This doesn't seem very useful, but that's what it did back then. In python 2.4, the behavior was: the command line is effectively reinterpreted from python -m The -m flag originally served a simpler purpose- to convert a module name into a script name. This is actually an interesting question, so let's explore pep 338 linked by in the top comment. The source for the if _name_ = "_main_" block for the timeit module can be found here. This returns the error: "python: can't open file '/home//timeit': No such file or directory"Īdding the -m flag tells Python to look in path for timeit.py and execute the if _name_ = "_main_" clause from the file. The example from the Python docs uses timeit ( pip works the same): python3 timeit -s 'print("hello")' # 'python timeit.py.
#Python execute file from txt write code
This is useful because you do not want this code block to run when importing into other files, but you do want it to run when invoked from the command line.įor modules inside your project, this script/module construct should run as is, because Python will find the module from your working directory when running from the terminal: python some_module.pyīut for modules that are part of Python's Standard Library, this will not work. This block gets executed when running python some_module.py on the command line. To execute some_module as a script instead of importing it, you would define an if _name_ = "_main_" block inside the file. This enables the use of functions, classes, and variables defined in some_module inside the importing file. In Python, a module some_module is typically imported into another Python file with an import some_module statement at the top of the importing file. This is stated in the docs, but might be difficult to understand without some baseline knowledge. In a more general sense though, when using python -m some_module, the -m flag makes Python execute some_module as a script. Most people viewing this will likely want the explanation given above with pip.
#Python execute file from txt write windows
On UNIX systems the path environment variable is called $PATH, while on Windows systems it's referred to as %PATH% More general comments about the -m-flag (Dec. If no match occurs, you get a Command not found or a variation thereof. If the filename/command is found, the matched file gets executed without taking into account potential later matches. When you type a command, like python, this list is traversed from the first directory to the last, searching for a filename that matches the command you typed. The so-called path is a list of directories where your system searches for executables. It's good practice to always use -m, even if you have just one global version of Python installed from which you create virtual environments. The -m flag makes sure that you are using the pip that's tied to the active Python executable.
#Python execute file from txt write install
Python 3.8, or the Python version within the virtual environment?Īn easy way to get around that ambiguity is simply to use python -m pip install Then what version of pip is used? Is it the pip for the default version, i.e. Typing python in a shell starts the 3.9 interpreter. We now have the virtual environment activated using Python 3.9. venv/bin/activate # ".venv\Scripts\activate" on Windows Suppose you are then starting a new project where you want to use Python 3.9. Therefore, when you type python3 (Linux or Mac) or python (Windows) in a shell you will start a 3.8 interpreter because that's the first Python executable that is found when traversing your path.
It's the first one appearing in your path. You have three versions of Python installed:
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