Carl Banks wrote:
> On Jul 11, 10:48 am, wheres pythonmonks <wherespythonmo...@gmail.com>
> wrote:
>> I'm an old Perl-hacker, and am trying to Dive in Python.
>
> Welcome to the light.
>
>
>> I have some
>> easy issues (Python 2.6)
>> which probably can be answered in two seconds:
>>
>> 1. Why is it that I cannot use print in booleans?? e.g.:
>>
>>>>> True and print "It is true!"
>> I found a nice work-around using eval(compile(.....,"<string>","exec"))...
>> Seems ugly to this Perl Programmer -- certainly Python has something better?
>
> I'll repeat other people's sentiments: if you drop nothing else from
> your perl habits, drop this one.
>
>
>> 2. How can I write a function, "def swap(x,y):..." so that "x = 3; y
>> = 7; swap(x,y);" given x=7,y=3??
>> (I want to use Perl's Ref "\" operator, or C's &).
>> (And if I cannot do this [other than creating an Int class], is this
>> behavior limited to strings,
>> tuples, and numbers)
>
> Can't do it, but you can get reference-like behavior if you don't mind
> a level of indirection. For example:
>
> def swap(x,y):
> t = y[0]
> y[0] = x[0]
> x[0] = t
>
> a = [1]
> b = [2]
> swap(a,b)
or
def swap[x,y]:
x[0],y[0] = y[0],x[0]
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