[Tutor] python: how do I create a list of definitions?
brunson at brunson.com
Fri Jul 20 04:14:11 CEST 2007
Luke Paireepinart wrote:
> elis aeris wrote:
>> like, I am doing string substitution:
>> if x = 2243:
> this will always evaluate to true.
Good eye, I missed that completely...
However, that will actually throw an exception.
>>> if x = 1:
File "<stdin>", line 1
if x = 1:
SyntaxError: invalid syntax
Guido did it that way just to avoid programming errors like that.
Python ain't C (thankfully).
> x is being assigned the value of 2243. 2243 is being returned by the
> You can observe this in the following situation:
> >>> y = x = 2243
> >>> y
> As you can see, (x = 2243) assigns the variable name to the integer
> 2243, then assigns y to this integer object as well.
> so in essence you're saying
> if 2243:
> which is the same as saying 'if ' and anything nonzero, which is True.
> so basically the following line
>> string = string + "e"
> is always being executed.
>> if x = 2234:
>> string = string + "p"
> same with this one.
>> how do I create this:
>> list = [
>> and so forth,
>> so I can use it like this:
>> for a in range(10):
>> If x = list[a]:
> If is invalid. Python is case sensitive. 'if' and 'If' are not the same.
> Also, you're using an assignment instead of a comparison again.
>> string = string + list[a]
> You could probably solve this easily with a dictionary.
> Tutor maillist - Tutor at python.org
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