Python string argument without an encoding

python python-3.x encoding python-unicode
lonely picture lonely · Jul 1, 2015 · Viewed 88.6k times · Source

Am trying to a run this piece of code, and it keeps giving an error saying "String argument without an encoding"

ota_packet = ota_packet.encode('utf-8') + bytearray(content[current_pos:(final_pos)]) + '\0'.encode('utf-8')

Any help?

Answer

Martijn Pieters picture Martijn Pieters · Jul 1, 2015

You are passing in a string object to a bytearray():

bytearray(content[current_pos:(final_pos)])

You'll need to supply an encoding argument (second argument) so that it can be encoded to bytes.

For example, you could encode it to UTF-8:

bytearray(content[current_pos:(final_pos)], 'utf8')

From the bytearray() documentation:

The optional source parameter can be used to initialize the array in a few different ways:

  • If it is a string, you must also give the encoding (and optionally, errors) parameters; bytearray() then converts the string to bytes using str.encode().

Related questions

What's "ANSI_X3.4-1968" encoding?

See following output on my system: [STEP 101] # python3 -c 'import sys; print(sys.stdout.encoding)' ANSI_X3.4-1968 [STEP 102] # [STEP 103] # locale LANG=C LANGUAGE=en_US:en LC_CTYPE="C" LC_NUMERIC="C" LC_TIME="C" LC_COLLATE="C" …

Read More
Let JSON object accept bytes or let urlopen output strings

With Python 3 I am requesting a json document from a URL. response = urllib.request.urlopen(request) The response object is a file-like object with read and readline methods. Normally a JSON object can be created with a file opened in …

Read More
Should I use encoding declaration in Python 3?

Python 3 uses UTF-8 encoding for source-code files by default. Should I still use the encoding declaration at the beginning of every source file? Like # -*- coding: utf-8 -*-

Read More