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January 24, 2012 01:07
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using command line arguments in python
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| # example of how to use command-line arguments | |
| import sys | |
| #=================================================== | |
| # COMMAND LINE HANDLING | |
| # this is the message the user will get if they don't supply the right number | |
| # of args at the command line | |
| help = """ | |
| usage: hailstone.py num | |
| where "num" is an integer and is used as the starting number | |
| """ | |
| # get command line args. | |
| # we have to remove the first element of this list, | |
| # which is the path of the program itself | |
| args = sys.argv[1:] | |
| # print the help and quit in certain situations: | |
| # * wrong number of args | |
| # * user asked for help | |
| if len(args) != 1 or '-h' in args or '--help' in args: | |
| print help | |
| sys.exit(0) | |
| # assign args to variables so we can use them later in the program | |
| n = args[0] | |
| # ... | |
| # (the rest of your program goes here) | |
| # ... | |
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