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In my program I have a string like this:
ag ct oso gcota
Using python, my goal is to get rid of the white space and keep only the a,t,c,and g characters. I understand how to get rid of the white space (I'm just using line = line.replace(" ", "")). But how can I get rid of the characters that I don't need when they could be any other letter in the alphabet?
307
Using 'str. replace() , we can replace a specific character. If we want to remove that specific character, replace that character with an empty string. The str. replace() method will replace all occurrences of the specific character mentioned.
Using translate(): translate() is another method that can be used to remove a character from a string in Python. translate() returns a string after removing the values passed in the table. Also, remember that to remove a character from a string using translate() you have to replace it with None and not "" .
Use the . strip() method to remove whitespace and characters from the beginning and the end of a string. Use the . lstrip() method to remove whitespace and characters only from the beginning of a string.
A very elegant and fast way is to use regular expressions:
import re
str = 'ag ct oso gcota'
str = re.sub('[^atcg]', '', str)
"""str is now 'agctgcta"""
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