Why Python -m

The difference between python -m and python

The meaning of m means that the library is executed as a script.

python file.py

Normal execution of Python scripts seems to be like this, even some friends don't even know what -m is.

The explanation of -m in help is: Treat the file as a script to execute.

What does it mean to execute it as a script? Let's take a look

Write a simple test script bar.py

import sys
 
print('sys.path len is %s.'% sys.path.__len__())for path in sys.path:print(path)

Then execute separately to see the results

python -m bar # bar! ! ! Not a bar.py pit! ! !

Therefore, the first line and the last added environment variable is empty, and the meaning of empty is the current folder. Which is the directory where your command is executed

python bar.py

The first line is the absolute path, the directory where the file is located. Not the directory where the script is executed.

note

1 - The m parameter cannot be followed by .py, which is equivalent to import bar

2 - m supports . syntax python -m http.server to start a web server

PS: Let's take a look at the meaning of python -m

Simply put: Execute files under a certain module
The form of the parameter after python -m is the module name. File name

The module can be run as a script. Look at the difference between the running mode and python file.py.

Using this command will search and execute py files in the library path, not only in the current library.

The explanation in the python parameter description is:

run library module as a script.

to sum up

So far, this article about why Python -m is introduced. For more related content about the difference between python -m and python, please search for ZaLou.Cn's previous articles or continue to browse the related articles below. Hope you will support ZaLou more in the future. .Cn!