explain lambda x: (len(x), x) code example

Example 1: map function using lambda in python

# Map function 

nums1 = [2,3,5,6,76,4,3,2]
sq = list(map(lambda a : a*a, nums1))
print(sq)

Example 2: python3 lambda

>>> sum = lambda x, y : x + y
>>> sum(3,4)
7