Unlike list extend(), there is no extend function in the Python set. However, you can use Union, Intersection, Difference, or Symmetric difference method to extend the set in Python.
Read:
- Python set union method
- Python intersection of two sets
- Python set difference method
- Python Set symmetric difference Method
Python set extend the example
Simple example code using an operator to extend set.
A = {0, 2, 4, 6}
B = {1, 2, 3, 4}
print("Union :", A | B)
print("Intersection :", A & B)
print("Difference :", A - B)
# elements not present both sets
print("Symmetric difference :", A ^ B)
Output:
How can I extend a set with a tuple?
Answer: Use the union method to extend the set with tuple values.
t1 = (1, 2, 3)
t2 = (3, 4, 5)
t3 = (5, 6, 7)
s = set()
s = s.union(t1)
s = s.union(t2)
s = s.union(t3)
print(s)Or cleaner method
s = set().union(t1, t2, t3)Output:
{1, 2, 3, 4, 5, 6, 7}
Source: stackoverflow.com
A quick way to extend a set if we know elements are unique
Answer: Use set update to save allocating a new set all the time so it should be a little faster than set union in Python.
set1 = {1, 2, 3, 4}
set2 = {0, 10}
set1.update(set2)
print(set1)
Output:
{0, 1, 2, 3, 4, 10}
Do comment if you have any doubts or suggestions on this Python set tutorial.
Note: IDE: PyCharm 2021.3.3 (Community Edition)
Windows 10
Python 3.10.1
All Python Examples are in Python 3, so Maybe its different from python 2 or upgraded versions.