convert a long string in binary

[bussiere maillist]

i've got a very long string
and i wanted to convert it in binary
like

string = """Monty Python, or The Pythons, is the collective name of
the creators of Monty Python's Flying Circus, a British television
comedy sketch show that first aired on the BBC on October 5, 1969. A
total of 45 episodes were made over four series. However, the Python
phenomenon was much greater, spawning stage tours, a musical, four
films, numerous albums, and several books, as well as launching the
members to individual stardom.

The television series, broadcast by the BBC from 1969 to 1974, was
conceived, written and performed by Graham Chapman, John Cleese
(1969-1973), Terry Gilliam, Eric Idle, Terry Jones and Michael Palin.
Loosely structured as a sketch show, but with a highly innovative
stream-of-consciousness approach (aided by Terry Gilliam's
animations), it pushed the boundaries of what was then considered
acceptable, both in terms of style and content.
"""

string = binary(string)
print string
// 01010101010101


i 'am searching for something like the binary function (taht doesn't
exist) to convert my string directly in binary.

Regards
Bussiere

 

[bearophileHUGS]

bussiere maillist:

i've got a very long string
and i wanted to convert it in binary

Not much tested:

_nibbles = {"0":"0000", "1":"0001", "2":"0010", "3":"0011",
"4":"0100", "5":"0101", "6":"0110", "7":"0111",
"8":"1000", "9":"1001", "A":"1010", "B":"1011",
"C":"1100", "D":"1101", "E":"1110", "F":"1111"}

def toBase2(number):
if number < 16:
return "0000" + _nibbles["%X" % number]
else:
d1, d2 = "%X" % number
return _nibbles[d1] + _nibbles[d2]

convbin = dict((chr(i), toBase2(i)) for i in xrange(256))

def binary(s):
return "".join(convbin[c] for c in s)

print binary("testing string")

Surely there are ways to make it shorter (But it's fast enough).

Bye,
bearophile

 

[mensanator]

i've got a very long string
and i wanted to convert it in binary
like

string = """Monty Python, or The Pythons, is the collective name of
the creators of Monty Python's Flying Circus, a British television
comedy sketch show that first aired on the BBC on October 5, 1969. A
total of 45 episodes were made over four series. However, the Python
phenomenon was much greater, spawning stage tours, a musical, four
films, numerous albums, and several books, as well as launching the
members to individual stardom.

The television series, broadcast by the BBC from 1969 to 1974, was
conceived, written and performed by Graham Chapman, John Cleese
(1969-1973), Terry Gilliam, Eric Idle, Terry Jones and Michael Palin.
Loosely structured as a sketch show, but with a highly innovative
stream-of-consciousness approach (aided by Terry Gilliam's
animations), it pushed the boundaries of what was then considered
acceptable, both in terms of style and content.
"""

string = binary(string)
print string
// 01010101010101


i 'am searching for something like the binary function (taht doesn't
exist) to convert my string directly in binary.

The gmpy module can convert numbers to binary strings:

import gmpy

s = """
Yes, well, of course that's just the sort of
blinkered philistine pig ignorance I've come
to expect from you non-creative garbage.
"""

ss = ''
for c in s:
sb = gmpy.digits(ord(c),2) #convert to binary string
sb = '0'*(8-len(sb)) + sb #add leading 0's
ss += sb

print ss



000010100101100101100101011100110010110000100000011101110110010101101100011011000010110000100000011011110110011000100000011000110110111101110101011100100111001101100101001000000111010001101000011000010111010000100111011100110010000001101010011101010111001101110100001000000111010001101000011001010010000001110011011011110111001001110100001000000110111101100110000010100110001001101100011010010110111001101011011001010111001001100101011001000010000001110000011010000110100101101100011010010111001101110100011010010110111001100101001000000111000001101001011001110010000001101001011001110110111001101111011100100110000101101110011000110110010100100000010010010010011101110110011001010010000001100011011011110110110101100101000010100111010001101111001000000110010101111000011100000110010101100011011101000010000001100110011100100110111101101101001000000111100101101111011101010010000001101110011011110110111000101101011000110111001001100101011000010111010001101001011101100110010100100000011001110110000101110010011000100110000101100111011001010010111000001010

 

[Maric Michaud]

Le dimanche 20 août 2006 13:55, (e-mail address removed) a écrit :

bussiere maillist:

i've got a very long string
and i wanted to convert it in binary

Not much tested:

_nibbles = {"0":"0000", "1":"0001", "2":"0010", "3":"0011",
"4":"0100", "5":"0101", "6":"0110", "7":"0111",
"8":"1000", "9":"1001", "A":"1010", "B":"1011",
"C":"1100", "D":"1101", "E":"1110", "F":"1111"}

def toBase2(number):
if number < 16:
return "0000" + _nibbles["%X" % number]
else:
d1, d2 = "%X" % number
return _nibbles[d1] + _nibbles[d2]

convbin = dict((chr(i), toBase2(i)) for i in xrange(256))

def binary(s):
return "".join(convbin[c] for c in s)

print binary("testing string")

Surely there are ways to make it shorter (But it's fast enough).

Maybe this one is more elegant :

In [305]: trans = {}

In [306]: for i in range(256) :
.....: trans[chr(i)] = ''.join(i & 2**j and '1' or '0'
.....: for j in reversed(range(8)))
.....:

In [307]: trans['a']
Out[307]: '01100001'

In [308]: trans['\xee']
Out[308]: '11101110'

In [309]: print ''.join(trans[e] for e in 'test string')
0111010001100101011100110111010000100000011100110111010001110010011010010110111001100111

Bye,
bearophile

--
_____________

Maric Michaud
_____________

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