CODEWITHSUNDEEP
pythonunicode
Richard
Richard

Reputation: 753

Convert unicode codepoint to UTF8 hex in python

I want to convert a number of unicode codepoints read from a file to their UTF8 encoding.

e.g I want to convert the string 'FD9B' to the string 'EFB69B'.

I can do this manually using string literals like this:

u'\uFD9B'.encode('utf-8')

but I cannot work out how to do it programatically.

Upvotes: 16

Views: 38028

Answers (6)

unwind
unwind

Reputation: 399813

Use the built-in function chr() to convert the number to character, then encode that:

>>> chr(int('fd9b', 16)).encode('utf-8')
'\xef\xb6\x9b'

This is the string itself. If you want the string as ASCII hex, you'd need to walk through and convert each character c to hex, using hex(ord(c)) or similar.

Note: If you are still stuck with Python 2, you can use unichr() instead.

Upvotes: 24

Jaymon
Jaymon

Reputation: 5728

Because you might encounter an error while using unichr with wide unicode characters:

>>> n = int('0001f600', 16)
>>> unichr(n)
ValueError: unichr() arg not in range(0x10000) (narrow Python build)

Here is another approach for wide unicode on narrow python builds:

>>> n = int('0001f600', 16)
>>> s = '\\U{:0>8X}'.format(n)
>>> s = s.decode('unicode-escape')
>>> s.encode("utf-8")
'\xf0\x9f\x98\x80'

And using the original question's value:

>>> n = int('FD9B', 16)
>>> s = '\\u{:0>4X}'.format(n)
>>> s = s.decode('unicode-escape')
>>> s.encode("utf-8")
'\xef\xb6\x9b'

Upvotes: 0

simon
simon

Reputation: 16300

here's a complete solution:

>>> ''.join(['{0:x}'.format(ord(x)) for x in unichr(int('FD9B', 16)).encode('utf-8')]).upper()
'EFB69B'

Upvotes: 4

tzot
tzot

Reputation: 95921

If the input string length is a multiple of 4 (i.e. your unicode code points are UCS-2 encoded), then try this:

import struct

def unihex2utf8hex(arg):
    count= len(arg)//4
    uniarr= struct.unpack('!%dH' % count, arg.decode('hex'))
    return u''.join(map(unichr, uniarr)).encode('utf-8').encode('hex')

>>> unihex2utf8hex('fd9b')
'efb69b'

Upvotes: 1

pixelbeat
pixelbeat

Reputation: 31718

data_from_file='\uFD9B'
unicode(data_from_file,"unicode_escape").encode("utf8")

Upvotes: 3

Virgil Dupras
Virgil Dupras

Reputation: 2654

Python 2.6.2 (r262:71600, Apr 16 2009, 09:17:39) 
[GCC 4.0.1 (Apple Computer, Inc. build 5250)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> u'\uFD9B'.encode('utf-8')
'\xef\xb6\x9b'
>>> s = 'FD9B'
>>> i = int(s, 16)
>>> i
64923
>>> unichr(i)
u'\ufd9b'
>>> _.encode('utf-8')
'\xef\xb6\x9b'

Upvotes: 2

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