what does **kw mean?

[zslevi]

I've been reading the following example, and couldn't figure out, what
**kw mean. (It's an empty dictionary, but what's the semantics):
def wrap(method):
def wrapped(self, *args, **kw):
print "begin"
method(self, *args, **kw)
print "end"
return wrapped
class Test(object):
def method(self, name):
print "method(%r)" % name

t = Test()
t.method("pure")
Test.method = wrap(Test.method)
t.method("wrapped")

[Shane Geiger]

Does this help?

def foobar(first_name,last_name, *args, **kwargs):
print first_name
print last_name
print "Tuple:",args
print "Dict:",kwargs

x = "has"
y = "demonstrated"
foobar('Shane','Geiger', x, y, adjective='useful', thing='PYTHON trick
known as extended call syntax', adverb='wonderfully')


zs****@gmail.com wrote:

I've been reading the following example, and couldn't figure out, what
**kw mean. (It's an empty dictionary, but what's the semantics):
def wrap(method):
def wrapped(self, *args, **kw):
print "begin"
method(self, *args, **kw)
print "end"
return wrapped
class Test(object):
def method(self, name):
print "method(%r)" % name

t = Test()
t.method("pure")
Test.method = wrap(Test.method)
t.method("wrapped")

--
Shane Geiger
IT Director
National Council on Economic Education
sg*****@ncee.net | 402-438-8958 | http://www.ncee.net

Leading the Campaign for Economic and Financial Literacy

[Bruno Desthuilliers]

zs****@gmail.com a écrit :

I've been reading the following example, and couldn't figure out, what
**kw mean. (It's an empty dictionary, but what's the semantics):

Keyword varargs. And FWIW, *args is for positional varargs.

[Lie]

On Jan 11, 4:38*pm, "[e-mail]" <[e-mail]:

I've been reading the following example, and couldn't figure out, what
**kw mean. (It's an empty dictionary, but what's the semantics):

It's a keyword argument. It's some kind of repository for arguments
that aren't recognized.

If you have function like this:
def func(a, *args, *kw):
print a
print args
print kw

and you call the functin like this:
func('value A', 'value B', 'value C', argumentA = 'value D', argumentB
= 'value D')
the extra arguments would normally raise an error, but with the * and
**, Python would:
- assign 'value B' and 'value C' to args
- assign 'argumentA':'value D' and 'argumentB':'value E' to kw

so if you run the function, it will output:
####
value A
('value B', 'value C')
{'argumentB': 'value E', 'argumentA': 'value D'}
####

this args and kw can be accessed like a tuple and dictionary
respectively

See '4.7.2 Keyword Arguments' and '4.7.3 Arbitrary Argument Lists' on
Python Help File

[zslevi]

On Jan 11, 12:24 pm, Lie <[e-mail]:

On Jan 11, 4:38 pm, "[e-mail]" <[e-mail]:

I've been reading the following example, and couldn't figure out, what
**kw mean. (It's an empty dictionary, but what's the semantics):

It's a keyword argument. It's some kind of repository for arguments
that aren't recognized.

If you have function like this:
def func(a, *args, *kw):
print a
print args
print kw

and you call the functin like this:
func('value A', 'value B', 'value C', argumentA = 'value D', argumentB
= 'value D')
the extra arguments would normally raise an error, but with the * and
**, Python would:
- assign 'value B' and 'value C' to args
- assign 'argumentA':'value D' and 'argumentB':'value E' to kw

so if you run the function, it will output:
####
value A
('value B', 'value C')
{'argumentB': 'value E', 'argumentA': 'value D'}
####

this args and kw can be accessed like a tuple and dictionary
respectively

See '4.7.2 Keyword Arguments' and '4.7.3 Arbitrary Argument Lists' on
Python Help File

Thanks!