command line parameters

I am a new Python programming user. I am working on user-friendly command-line interfaces, and I want to pass input via the shell args as follows:

./myscript.py filename
./myscript.py in.file output.file
./myscript.py -i in.file -o output.file

How do I pass and parse command-line options and arguments using Python under Unix like operating systems?

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I‘m writing a wrapper bash shell script that will get the last argument (a domain name) from the command line into a shell variable called $_domain. I need to find all other parameters before last parameter in $@ and stored in a shell variable called $allargs. So that I can pass them as follows:

/path/to/real/binary “$allargs” “$_domain”

How do I do this using bash shell under Unix like operating systems?

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