Is it allowed to use function results as default arguments ?

[Stef Mientki]

hello,

I've a perfect working procedure,
at least as far I've tested it it works perfect.

But I was just experimenting with inspect,
and saw that the default argument was not parsed correctly.

So I wonder if this is allowed:

def Get_Relative_Path ( target, base=os.curdir ) :
...

As inspect returns the following:

(['target', 'base'], None, None, ('.',))

thanks,
Stef Mientki

 

[Simon Forman]

hello,

I've a perfect working procedure,
at least as far I've tested it it works perfect.

But I was just experimenting with inspect,
and saw that the default argument was not parsed correctly.

So I wonder if this is allowed:

def Get_Relative_Path ( target, base=os.curdir ) :
  ...

As inspect returns the following:

(['target', 'base'], None, None, ('.',))

thanks,
Stef Mientki

os.curdir is '.' on many platforms. What did you expect inspect to
show?

|>>> import os
|>>> os.curdir
'.'

 

[Benjamin]

hello,

I've a perfect working procedure,
at least as far I've tested it it works perfect.

But I was just experimenting with inspect,
and saw that the default argument was not parsed correctly.

So I wonder if this is allowed:

def Get_Relative_Path ( target, base=os.curdir ) :

Did you perhaps mean to say def Get_Relative_Path(target,
base=os.getcwd()):

  ...

As inspect returns the following:

(['target', 'base'], None, None, ('.',))

thanks,
Stef Mientki

 

[fred.haab]

Well, others have answered the question, but I thought I'd throw in
that it would be more pythonic to do something like:

def Get_Relative_Path(target, base = None):
if base is None:
base = os.curdir
...

 

[Terry Reedy]

Well, others have answered the question, but I thought I'd throw in
that it would be more pythonic to do something like:

def Get_Relative_Path(target, base = None):
if base is None:
base = os.curdir
...

Since os.curdir is a constant, this is nonesensical. One only needs the
dummy default when one wants an expression re-evaluated with each call.