find isset() php function equivalent in python

[Olivier Noblanc ATOUSOFT]

Hello
What is the equivalent function of php isset() in python

Thank you very much.

olivier noblanc
http://www.logiciel-erp.fr

[Ola Natvig]

Olivier Noblanc ATOUSOFT wrote:

Hello
What is the equivalent function of php isset() in python

Thank you very much.

olivier noblanc
http://www.logiciel-erp.fr

try:
if variable:
# isset
pass
except NameError:
# not set
pass

could work...

--
--------------------------------------
Ola Natvig <ol********@infosense.no>
infoSense AS / development

[Max M]

Ola Natvig wrote:

Olivier Noblanc ATOUSOFT wrote:

Hello
What is the equivalent function of php isset() in python

try:
if variable:
# isset
pass
except NameError:
# not set
pass

you could use:

'variable' in vars()
But be aware that it is bad bad practice to do it like that.

If you need variables that you don't know that name of, you should put
them in a dictionary. They are made for that exact purpose.
unkown_vars = {}
unkown_vars['variable'] = 42
'variable' in unkown_vars

True
--

hilsen/regards Max M, Denmark

http://www.mxm.dk/
IT's Mad Science

[Ola Natvig]

Max M wrote:

Ola Natvig wrote:

Olivier Noblanc ATOUSOFT wrote:

Hello
What is the equivalent function of php isset() in python

try:
if variable:
# isset
pass
except NameError:
# not set
pass

you could use:

>>> 'variable' in vars()
But be aware that it is bad bad practice to do it like that.

If you need variables that you don't know that name of, you should put
them in a dictionary. They are made for that exact purpose.
>>> unkown_vars = {}
>>> unkown_vars['variable'] = 42
>>> 'variable' in unkown_vars

True

If it's a greater possibility that the 'variable' are set than it's not
you will get better performance when using:

try:
print unknown_vars['variable']
except KeyError:
print 'variable are not set'

istead of

if 'variable' in unknown_vars:
print unknown_vars['variable']
else:
print 'variable are not set'

You could even use

print unknown_vars.get('variable', 'variable are not set')

dictionary.get(key, default) returns the default if key are not located
in the dictionary, I'm not sure if the function uses the try / except
KeyError aproach or what it uses.

--
--------------------------------------
Ola Natvig <ol********@infosense.no>
infoSense AS / development