This works perfectly in python2.x but not on python3.x

Question

import sys
print (sys.version) 

def add_pair((a,b),(c,d)):
    return a+c, b+d

print (add_pair((10,20),(30,40)))

Tuple parameter unpacking [is not supported](https://www.python.org/dev/peps/pep-3113/) in python 3. — Lafexlos, Sep 24 '18 at 05:47
Similarly what will be the equivalent conversion for this lambda (x, (y, z)): x, y + z — Syed Ikram, Sep 24 '18 at 08:05

score 2 · Answer 1 · answered Sep 24 '18 at 05:47

import sys
print(sys.version)

def add_pair(x,y):  
    ''' Unpack the tuples here e.g  a, b = x, c, d = y or as below (as per the req)''' 
    return(x[0]+y[0], x[1]+y[1])

print(add_pair((10,20),(30,40)))

Tuple parameters are no longer support in Python3: http://www.python.org/dev/peps/pep-3113/

You have to unpack the tuples before doing any operation in the function.

score 0 · Accepted Answer · answered Sep 24 '18 at 05:49

I'm surprised it supposedly works in 2.x, but apparently explicit tuples were ok in function arguments. But this was never great style. Function arguments should just be separated by commas. This works in both:

def add_pair(pair1, pair2): 
    a, b = pair1
    c, d = pair2
    return a+c, b+d

print(add_pair((10, 20), (30, 40)))

Vikas Periyadath · Answer 3 · 2018-09-24T06:11:56.373

0

They removed the unpacking of tuple parameter in python3. So alternative way of doing it is like this or mentioned in above answers :

def add_pair(*kwargs):
    return tuple(sum(i) for i in zip(*kwargs))

print(add_pair((10,20),(30,40)))
# (40, 60)

edited Sep 24 '18 at 06:11

answered Sep 24 '18 at 05:59

Vikas Periyadath

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This works perfectly in python2.x but not on python3.x

3 Answers3