repr.py

#!/usr/bin/env python

from __future__ import unicode_literals, print_function
import codecs
import operator
import sys

in_data = {'a':1, 'b': u'abc', 'c': 'xyz', 'd': False, 'e': {'a': 1, 'b': u'2', 'c': '3'}, 'f': [1, u'2', '3'],
'some_unicode': u'\U0001f4a9',
'some_bytes': b'a\xffb',
}

utype = type(u'')
str_is_bytes = str is bytes

def simple_repr(o, f, indent=0):
    if isinstance(o, dict):
        f.write('{\n')
        for k, v in sorted(o.items(), key=operator.itemgetter(0)):
            f.write(' ' * (indent + 2))
            simple_repr(k, f, indent + 2)
            f.write(': ')
            simple_repr(v, f, indent + 2)
            f.write(',\n')
        f.write(' ' * indent)
        f.write('}')
    elif isinstance(o, bytes):
        if str_is_bytes:
            f.write('b')
        f.write(repr(o))
    elif isinstance(o, utype):
        f.write("'")
        f.write(o)
        f.write("'")
    elif hasattr(o, '__iter__'):
        f.write('[\n')
        for i in o:
            f.write(' ' * (indent + 2))
            simple_repr(i, f, indent + 2)
            f.write(',\n')
        f.write(' ' * indent)
        f.write(']')
    else:
        f.write(repr(o))

f = codecs.open('/dev/null', 'w', 'utf-8')
if False:
    #XXX: comment out the 'some_bytes' line in in_data or json.dump will choke
    import timeit
    print('json.dump(): %f' % timeit.timeit(stmt='json.dump(in_data, f, sort_keys=True, ensure_ascii=False, indent=2)', number=100000, setup="import json; from __main__ import in_data, f"))
    print('simple_repr(): %f' % timeit.timeit(stmt='simple_repr(in_data, f)', number=100000, setup="from __main__ import simple_repr, in_data, f"))

if True:
    out = codecs.open(sys.argv[1], 'w', 'utf-8') if len(sys.argv) > 1 else sys.stdout
    out.write('''# coding: utf-8
from __future__ import unicode_literals
out_data = ''')
    simple_repr(in_data, out)