How to extract substring from a 'binary string' in python3

Question

I have a string b'helloworld\n'. I want to extract helloworld from it. For this, I am doing

print(string[1:-2])

But on output I am getting b'elloworl'.

How can I extraxt helloworld.

Thanks

b in front of string is a string literal which means string would of bytes type instead of str type and don't impact literal meaning of the string. See docs.python.org/3.3/reference/… for more info. — apsdehal
– apsdehal, Commented Nov 9, 2017 at 6:42
@apsdehal Thanks. I solved it using string.decode("utf-8") — S Andrew
– S Andrew, Commented Nov 9, 2017 at 6:46

Antithesis · Accepted Answer · 2017-11-09 06:44:33Z

5

print(s[0:-1])

Indexes are zero based so the h is at index zero. The ending index is non-inclusive, so go one extra.

If you want to get rid of the b you have to decode the bytes object.

print(s.decode('utf-8')[0:-1])

answered Nov 9, 2017 at 6:38

Antithesis

1818 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Alperen · Accepted Answer · 2017-11-09 06:56:47Z

0

From this link, to change binary string to normal string use this:

>>> b'helloworld\n'.decode('ascii') # you can use utf8 or something else, it is up to you
'helloworld\n'

To delete whitespaces use strip():

>>> b'helloworld\n'.decode('ascii').strip()
'helloworld'

answered Nov 9, 2017 at 6:56

Alperen

4,8525 gold badges32 silver badges54 bronze badges