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Command Line Arguments, Basic Computer Science

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You may have seen, as, that many programs can be run so that they give you with some basic information concerning how they should be run. Python permits you to do this with -h:
$ python .h
Usage: python [option]..... [-c cmd | -m mod | file | -] [arg]..
Options and arguments (and equivalent environment variables):
-c cmd : program passed in as string (terminates option list)
-d : debug output beginning parser (also PYTHONDEBUG=x)
-E : disregard environment variables (for example PYTHONPATH)
-h : print this help message and exit (also --help)

[etc. ]

Variables are nothing but set aside memory locations to store values. It means that when you generate a variable you reserve a few space in memory.
Depending on the data type of a variable, the interpreter assigns memory and chooses what can be stored in the reserved memory. Consequently, by assigning dissimilar data types to variables, you can store decimals, integers or characters in these variables.

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