Sometimes, we want to find and replace elements in a list with Python.

In this article, we’ll look at how to find and replace elements in a list with Python.

How to find and replace elements in a list with Python?

To find and replace elements in a list with Python, we can use list comprehension.

For instance, we write:

a = [1, 2, 3, 1, 3, 2, 1, 1]
b = [100 if x == 1 else x for x in a]
print(b)

We have list a and we want to replace all the 1’s with 100.

To do this, we write [100 if x == 1 else x for x in a].

We check if x is 1 where x is each entry in a.

We put 100 in the returned array if x is 1. Otherwise, we put x in the array.

Then we assign the returned array to b.

Therefore b is [100, 2, 3, 100, 3, 2, 100, 100].

Conclusion

To find and replace elements in a list with Python, we can use list comprehension.