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_os.py	2.24 KB	-rw-r--r--
archive.py	7.88 KB	-rw-r--r--
asyncio.py	1.29 KB	-rw-r--r--
autoreload.py	23.67 KB	-rw-r--r--
baseconv.py	2.92 KB	-rw-r--r--
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numberformat.py	3.53 KB	-rw-r--r--
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topological_sort.py	1.18 KB	-rw-r--r--
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version.py	3.34 KB	-rw-r--r--
xmlutils.py	1.12 KB	-rw-r--r--

Code Editor : baseconv.py

# Copyright (c) 2010 Guilherme Gondim. All rights reserved.
# Copyright (c) 2009 Simon Willison. All rights reserved.
# Copyright (c) 2002 Drew Perttula. All rights reserved.
#
# License:
#   Python Software Foundation License version 2
#
# See the file "LICENSE" for terms & conditions for usage, and a DISCLAIMER OF
# ALL WARRANTIES.
#
# This Baseconv distribution contains no GNU General Public Licensed (GPLed)
# code so it may be used in proprietary projects just like prior ``baseconv``
# distributions.
#
# All trademarks referenced herein are property of their respective holders.
#

"""
Convert numbers from base 10 integers to base X strings and back again.

Sample usage::

>>> base20 = BaseConverter('0123456789abcdefghij')
  >>> base20.encode(1234)
  '31e'
  >>> base20.decode('31e')
  1234
  >>> base20.encode(-1234)
  '-31e'
  >>> base20.decode('-31e')
  -1234
  >>> base11 = BaseConverter('0123456789-', sign='$')
  >>> base11.encode('$1234')
  '$-22'
  >>> base11.decode('$-22')
  '$1234'

"""

BASE2_ALPHABET = '01'
BASE16_ALPHABET = '0123456789ABCDEF'
BASE56_ALPHABET = '23456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnpqrstuvwxyz'
BASE36_ALPHABET = '0123456789abcdefghijklmnopqrstuvwxyz'
BASE62_ALPHABET = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz'
BASE64_ALPHABET = BASE62_ALPHABET + '-_'

class BaseConverter:
    decimal_digits = '0123456789'

def __init__(self, digits, sign='-'):
        self.sign = sign
        self.digits = digits
        if sign in self.digits:
            raise ValueError('Sign character found in converter base digits.')

def __repr__(self):
        return "<%s: base%s (%s)>" % (self.__class__.__name__, len(self.digits), self.digits)

def encode(self, i):
        neg, value = self.convert(i, self.decimal_digits, self.digits, '-')
        if neg:
            return self.sign + value
        return value

def decode(self, s):
        neg, value = self.convert(s, self.digits, self.decimal_digits, self.sign)
        if neg:
            value = '-' + value
        return int(value)

def convert(self, number, from_digits, to_digits, sign):
        if str(number)[0] == sign:
            number = str(number)[1:]
            neg = 1
        else:
            neg = 0

# make an integer out of the number
        x = 0
        for digit in str(number):
            x = x * len(from_digits) + from_digits.index(digit)

# create the result in base 'len(to_digits)'
        if x == 0:
            res = to_digits[0]
        else:
            res = ''
            while x > 0:
                digit = x % len(to_digits)
                res = to_digits[digit] + res
                x = int(x // len(to_digits))
        return neg, res

base2 = BaseConverter(BASE2_ALPHABET)
base16 = BaseConverter(BASE16_ALPHABET)
base36 = BaseConverter(BASE36_ALPHABET)
base56 = BaseConverter(BASE56_ALPHABET)
base62 = BaseConverter(BASE62_ALPHABET)
base64 = BaseConverter(BASE64_ALPHABET, sign='$')

${this.title}

Code Editor : baseconv.py