Truncate a string to a specific number of bytes in Python

Question

How can I truncate a string to be no longer than 50 bytes?

a = 'asdfzx안녕하세요awelkjawletjawetr방갑습니다.dlgawklejtwgasdgsdfgd
sdfasdfsdafa궁금해요rewgargasregawergedrhsedhesrdhrthdrfjydjdrktydjdyj'
max = 50byte
a = max(a)

Asked By: Potem Potem

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Source

Answer 1

You can use getsizeof() to get the size and then put it in a if statement to check.getsizeof() returns the size of an object in bytes.Hope my example gives you an idea :

from sys import getsizeof
a = '4200547985984359347509gbrtbhrtbrtbargrefefwefwef'
b =  'hello'
if getsizeof(a.encode('ascii')) > 50 :
    print("Error:a")
if getsizeof(b.encode('ascii')) > 50 :
    print("Error:b")

Answered By: Taufiq Rahman

Answer 2

You could just use slicing if you are using a one character per byte encoding:

a = 'aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa'

a[:50]
'aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa'

Note that would only makes sense if you are writing this somewhere. If the size of the python object representation makes more sense in your use-case, the answer of @Achilles should works.

Answered By: Pierre Barre

Answer 3

Try this (to truncate to 10 bytes):

s = "asdfzx안녕하세요awelkjawletjawetr방갑습니"
s.encode('utf-8')[:10].decode('utf-8', 'ignore')

Answered By: Marek Příhoda

Truncate a string to a specific number of bytes in Python

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