[portland] Using Dictionary to Call Functions

kirby urner kirby.urner at gmail.com
Tue Jan 15 02:32:45 CET 2008

>    I want to get the dictionary keys in sequential order (there may be 1 to
> 7), and call the appropriate function for each one. The functions use
> mathplotlib to draw the curves on a common set of axes.

Hi Rich --

As the gurus here will tell you, dictionaries are by design ignorant of
sequence, though using keys 1-7 makes it easy for a key press to
access a function or whatever.

A typical idiom in a 1970s style menu-driven program would be:

myfuncs = [exit, foo, bar]

while True:

    print """
Main Menu

1  do foo
2  do bar
0  exit

    somenum = int( raw_input("Wanna do? ") )

    # whatever error trapping

    if somenum == 0:  break

    myfuncs[somenum]()  # take action!  (and loop to menu)

That's very simplified and doesn't address your
wanting to pass arguments etc.

myfuncs = {0:exit, 1:foo, 2:bar}  # dictionary instead of list

would pretty much serve the same purpose.



>    Suggestions and thoughts welcomed.
> Rich
> --
> Richard B. Shepard, Ph.D.               |  Integrity            Credibility
> Applied Ecosystem Services, Inc.        |            Innovation
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