What's the proper way to instantiate a new variable? x = ""?
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Re: New variable?
On Jun 3, 8:40 pm, tmallen <thomasmal...@g mail.comwrote:You don't need to pre-declare your variables. Just assign them as youWhat's the proper way to instantiate a new variable? x = ""?
need them and they will take the correct type.
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Re: New variable?
On Jun 3, 3:03 pm, Chris <cwi...@gmail.c omwrote:unless I'm using the += or a similar operator, right? That doesn'tOn Jun 3, 8:40 pm, tmallen <thomasmal...@g mail.comwrote:
>>What's the proper way to instantiate a new variable? x = ""?
You don't need to pre-declare your variables. Just assign them as you
need them and they will take the correct type.
seem to instantiate a variable.
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Re: New variable?
On Tue, Jun 3, 2008 at 3:16 PM, tmallen <thomasmallen@g mail.comwrote:Right... because you don't have anything to increment or append to. IOn Jun 3, 3:03 pm, Chris <cwi...@gmail.c omwrote:>>On Jun 3, 8:40 pm, tmallen <thomasmal...@g mail.comwrote:
>>>>What's the proper way to instantiate a new variable? x = ""?
>You don't need to pre-declare your variables. Just assign them as you
>need them and they will take the correct type.
unless I'm using the += or a similar operator, right? That doesn't
seem to instantiate a variable.
guess this also comes up in the case of something like lists or
dictionaries you want to uniformly create in a loop. I guess you
could call it instantiating, but really it's more like going ahead and
assigning to them as Chris mentioned and you're just starting them
with a default value. Assuming you're working with strings, x=""
should work just fine in that case. Lists, x=[], dictionaries, x={},
integers, probably x=1 or x=0...
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RE: New variable?
-----Original Message-----I've always usedFrom: python-list-bounces+jr9445= att.com@python. org [mailto:python-
list-bounces+jr9445= att.com@python. org] On Behalf Of tmallen
Sent: Tuesday, June 03, 2008 2:41 PM
To: python-list@python.org
Subject: New variable?
What's the proper way to instantiate a new variable? x = ""?
X = None
in those cases where I need to pre-declare a variable to set scope.
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Re: New variable?
On Jun 3, 9:34 pm, "Dan Upton" <up...@virginia .eduwrote:You can always use the conversion functions if you want to be explicitOn Tue, Jun 3, 2008 at 3:16 PM, tmallen <thomasmal...@g mail.comwrote:>On Jun 3, 3:03 pm, Chris <cwi...@gmail.c omwrote:On Jun 3, 8:40 pm, tmallen <thomasmal...@g mail.comwrote:>What's the proper way to instantiate a new variable? x = ""?>You don't need to pre-declare your variables. Just assign them as you
need them and they will take the correct type.>unless I'm using the += or a similar operator, right? That doesn't
seem to instantiate a variable.
Right... because you don't have anything to increment or append to. I
guess this also comes up in the case of something like lists or
dictionaries you want to uniformly create in a loop. I guess you
could call it instantiating, but really it's more like going ahead and
assigning to them as Chris mentioned and you're just starting them
with a default value. Assuming you're working with strings, x=""
should work just fine in that case. Lists, x=[], dictionaries, x={},
integers, probably x=1 or x=0...
str(), int(), list(), dict(), set() etc
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Re: New variable?
On Jun 4, 1:40 am, tmallen <thomasmal...@g mail.comwrote:You don't need to. The reason why you need to "declare" variable whenWhat's the proper way to instantiate a new variable? x = ""?
doing something like a += 1 is because this is actually a shorthand
for a = a + 1 (unless you override __radd__), the a on the right-hand
side is not yet assigned to any objects (remember that python use the
"name tag" model instead of "variable" model).
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