Python tutorial reading using the Python interpreter

2. After you configure environment variables, you can typically call Python directly from Python or by specifying a python version number.

   The Python interpreter operates like a Unix shell: it interactively interprets and executes commands when using a terminal device (TTY) as a standard input call, reads the file and executes the file as a script when using the file name parameter or as a file as a standard input.

   PYTHON-M module name [arg] ... #可以直接执行模块, similar to reading files directly and executing as scripts

   1 #  2"print (' Hello World ')"3 $ Hello World

3. Parameter passing

   When the interpreter is invoked, the script name and additional parameters are passed into asys.argvList of strings. You can get this list by executingimport sys, the length of the list is greater than or equal to 1, and there is at least one element when no script or parameter is given:sys.argv[0]This is an empty string. The script name is specified as‘-‘(indicates standard input),sys.argv[0]is set to‘-‘, using the-CinstructionWhensys.argv[0]is set to‘-c‘。 Using-MModuleparameter,sys.argv[0]is set to the full name of the specified module. -CinstructionOr-MModuleThe following parameters are not intercepted by the Python interpreter's option handling mechanism, but are left insys.argvFor the script command operation.

5. Specify encoding

#-*-Coding:utf-8-*-

Special encoding annotations must be defined in the first or second row of the file.

Python tutorial reading using the Python interpreter