why this split() doesn't work?

Question

str2="F_i_s_h"
str2.split(sep='_')
print(str2)

Output: F_i_s_h

Answer 1

https://code.sololearn.com/c2hZUPkRa8yY/?ref=app

See here, it will help you

Answer 2

str1 = "F_i_s_h"

str2 = str1.split('_')

print(str2)

It works like this.
When you split any string, you need to store that value into another string.