2.3.5. Interaction Between 2 Lists¶
2.3.5.1. set.intersection: Find the Intersection Between 2 Sets¶
If you want to get the common elements between 2 lists, convert lists to sets then use set.intersection to find the intersection between 2 sets.
requirement1 = ['pandas', 'numpy', 'statsmodel']
requirement2 = ['numpy', 'statsmodel', 'sympy', 'matplotlib']
intersection = set.intersection(set(requirement1), set(requirement2))
list(intersection)
['statsmodel', 'numpy']
2.3.5.2. Set Difference: Find the Difference Between 2 Sets¶
If you want to find the difference between 2 lists, turn those lists into sets then apply the difference() method to the sets.
a = [1, 2, 3, 4]
b = [1, 3, 4, 5, 6]
# Find elements in a but not in b
diff = set(a).difference(set(b))
print(list(diff))
[2]
# Find elements in b but not in a
diff = set(b).difference(set(a))
print(list(diff)) # [5, 6]
[5, 6]