conditionals in lambdas?

[Donald O'Donnell]

Sure you can:

>>> L = lambda string: string[:3] == 'yes'
>>> L('yesterday')
1
>>> L('tomorrow')
0

In fact you can do some pretty powerful stuff without using any 
statements at all, only logical expressions.  

For example:
>>> lambda sep: sep=='/' and 2 or sep==',' and 3 or sep=='-' and 4 or 5

this will return 2, 3, 4 for arguments '/', ',', '-' and 5 for anything
else.

To quote from the Python Reference Manual (Section 5.10 Boolean
operations):

"Note that neither `and` nor `or` restrict the value and type they
return 
to 0 or 1, but rather return the last evaluated argument. ..."

There's more in the manual.  Check it out, and have fun.

There's-more-to-logical-expressions-than-true-and-false-ly yours,

Don O'Donnell


"Michael P. Soulier" wrote:
> 
>     Hey people. If I want to put conditions in a lambda function, how would I
> go about that?
> 
> def test(string):
>     if string[:3] == 'yes:
>         return 1
>     else:
>         return 0
> 
>     I'd like to make something like this a lambda function. Is that possible?
> 
>     Mike
> 
> --