John O'Hagan a écrit :
Hi Pythonistas,
I'm looking for the best way to pass an arbitrary number and type of variables
created by one function to another.
>
They can't be global because they may
have different values each time they are used in the second function.
So far I'm trying to do something like this:
def process_args( [list, of, command-line, arguments] ):
do stuff
return {dictionary : of, local : variables }
def main_function( **kwargs ):
do stuff
return result
kw1 = process_args( [some, list] )
kw2 = process_args( [a, different, list] )
for i in main_function( **kw1 ):
kw2[ var1 ] = i
kw2[ var2 ] = len( i )
for j in main_function(**kw2):
print j
This only seems to work if I specify a default value for every possible
parameter of main_function and also for any others which may be passed to it,
which is a bit tedious because there are very many of them but only a few are
used in any given execution of the program.
If this is about commmand line arguments parsing and defaults, you may
want to have a look at the optparse package in the stdlib.
Also, kwargs work fine with default arguments too, ie:
def func(arg1=1, arg2='yadda', arg3=None):
print arg1, arg2, arg3
for kw in ({}, {'arg1':42}, {'arg2':'yop', 'arg3' : range(5)}):
func(**kw)
HTH
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