In the simplest terms...
I have a function that returns 3 values - >>> def sendnum():
-
... return 1,2,3
and a function that takes 3 arguments. - >>> def receive(a=4,b=5,c=6):
-
... print a,b,c
They of course do their individual jobs - >>> sendnum()
-
(1, 2, 3)
-
>>> receive(11,12,13)
-
11 12 13
Is there any way to code this so that the sending function doesn't send it as a list, or that the receiving function sees it as 3 different values? So instead of - >>> receive(sendnum())
-
(1, 2, 3) 5 6
I would get - >>> receive(sendnum())
-
1 2 3
4 2193 bvdet 2,851
Expert Mod 2GB
In the simplest terms...
I have a function that returns 3 values - >>> def sendnum():
-
... return 1,2,3
and a function that takes 3 arguments. - >>> def receive(a=4,b=5,c=6):
-
... print a,b,c
They of course do their individual jobs - >>> sendnum()
-
(1, 2, 3)
-
>>> receive(11,12,13)
-
11 12 13
Is there any way to code this so that the sending function doesn't send it as a list, or that the receiving function sees it as 3 different values? So instead of - >>> receive(sendnum())
-
(1, 2, 3) 5 6
I would get - >>> receive(sendnum())
-
1 2 3
- >>> receive(*sendnum())
-
1 2 3
-
>>>
Fantastic, what is terminology for this, so I can study up on it? I have tried it in an system which embeds python to access CAD functions, so I have no control over the supplied objects. This works perfect.
Thanks - >>> receive(*sendnum())
-
1 2 3
-
>>>
bvdet 2,851
Expert Mod 2GB
Fantastic, what is terminology for this, so I can study up on it? I have tried it in an system which embeds python to access CAD functions, so I have no control over the supplied objects. This works perfect.
Thanks
A function can accept a variable number of arguments if an asterisk (*) precedes the last argument in an argument list: - >>> def sample(s, *args):
-
... print s
-
... for item in args:
-
... print item
-
...
-
>>> s = 'A string'
-
>>> sample(s, 'This', 'is', 'a', 'test')
-
A string
-
This
-
is
-
a
-
test
-
>>> aList = ('This', 'is', 'a', 'test')
-
>>> sample(s, aList)
-
A string
-
('This', 'is', 'a', 'test')
-
>>> sample(s, *aList)
-
A string
-
This
-
is
-
a
-
test
-
>>>
A function can also accept a variable number of keyword arguments if '**' precedes the last argument in an argument list: - >>> def samplekw(**kargs):
-
... for key in kargs:
-
... print key, kargs[key]
-
...
-
>>> samplekw(**{'key1': 1, 'key2': 100})
-
key2 100
-
key1 1
-
>>> samplekw(key1=1, key2=100)
-
key2 100
-
key1 1
-
>>>
Combined: - >>> def sample(s, *args, **kargs):
-
... print s
-
... for item in args:
-
... print item
-
... for key in kargs:
-
... print key, kargs[key]
-
...
-
>>> sample(s, *aList, **{'key1': 1, 'key2': 100})
-
A string
-
This
-
is
-
a
-
test
-
key2 100
-
key1 1
-
>>>
Fantastic, what is terminology for this, so I can study up on it? I have tried it in an system which embeds python to access CAD functions, so I have no control over the supplied objects. This works perfect.
Thanks
Mark Lutz calls it "varargs" on p 338 of
7. More argument matching examples. Here is the sort of interaction you should get, along with comments that explain the matching that goes on: -
def f1(a, b): print a, b # normal args
-
-
def f2(a, *b): print a, b # positional varargs
-
-
f3(a, **b): print a, b # keyword varargs
-
-
f4(a, *b, **c): print a, b, c # mixed modes
-
-
f5(a, b=2, c=3): print a, b, c # defaults
-
-
f6(a, b=2, *c): print a, b, c # defaults + positional varargs
-
% python
-
>>> f1(1, 2) # matched by position (order matters)
-
1 2
-
>>> f1(b=2, a=1) # matched by name (order doesn't matter)
-
1 2
-
>>> f2(1, 2, 3) # extra positionals collected in a tuple
-
1 (2, 3)
-
>>> f3(1, x=2, y=3) # extra keywords collected in a dictionary
-
1 {'x': 2, 'y': 3}
-
>>> f4(1, 2, 3, x=2, y=3) # extra of both kinds
-
1 (2, 3) {'x': 2, 'y': 3}
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