Lambda in python

[Xx r3negade]

Hi, I am trying to convert the following procedural function into a lambda function:

def inc_e(e):
    if e < 10:
        e = e + 1
        return inc_e(e)
    else:
        return e
 
f = inc_e(0)
print f
 

This is what I have as my functional equivalent:

inc_e = lambda e:e < 10 and (e + 1, inc_e(e)) or e
print inc_e
 

The output of inc_e is:

<function <lambda> at 0x83ca28>
 

So what exactly is my lambda function returning? If it is returning inc_e(e), then why isn't the program just looping over and over?

[jlm699]

You need to call inc_e now with something like inc_e(5)

[Xx r3negade]

Okay, but now I get a "maximum recursion depth exceeded" error. Why is it not returning e when e is greater than 10?

[DarkStar]

Your problem is with the "e + 1" part.

>>> e = 1
>>> e + 1
2
>>> e
1
>>>

A working version of your lambda is here:

inc_e = lambda e:e < 10 and (inc_e(e+1)) or e