I have long string and I want to present it as a long num. I tried:
l=[ord (i)for i in str1]
but this is not what I need.
I need to make it long number and not numbers as items in the list.
this line gives me [23,21,45,34,242,32]
and I want to make it one long Number that I can change it again to the same string.
any idea?
Here is a translation of Paulo Bu's answer (with base64 encoding) into Python 3:
>>> import base64
>>> s = 'abcde'
>>> e = base64.b64encode(s.encode('utf-8'))
>>> print(e)
b'YWJjZGU='
>>> base64.b64decode(e).decode('utf-8')
'abcde'
Basically the difference is that your workflow has gone from:
string -> base64
base64 -> string
To:
string -> bytes
bytes -> base64
base64 -> bytes
bytes -> string
Is this what you are looking for :
>>> str = 'abcdef'
>>> ''.join([chr(y) for y in [ ord(x) for x in str ]])
'abcdef'
>>>
#! /usr/bin/python2
# coding: utf-8
def encode(s):
result = 0
for ch in s.encode('utf-8'):
result *= 256
result += ord(ch)
return result
def decode(i):
result = []
while i:
result.append(chr(i%256))
i /= 256
result = reversed(result)
result = ''.join(result)
result = result.decode('utf-8')
return result
orig = u'Once in Persia reigned a king …'
cipher = encode(orig)
clear = decode(cipher)
print '%s -> %s -> %s'%(orig, cipher, clear)
This is code that I found that works.
str='sdfsdfsdfdsfsdfcxvvdfvxcvsdcsdcs sdcsdcasd'
I=int.from_bytes(bytes([ord (i)for i in str]),byteorder='big')
print(I)
print(I.to_bytes(len(str),byteorder='big'))
What about using base 64 encoding? Are you fine with it? Here's an example:
>>>import base64
>>>s = 'abcde'
>>>e = base64.b64encode(s)
>>>print e
YWJjZGU=
>>>base64.b64decode(e)
'abcde'
The encoding is not pure numbers but you can go back and forth from string without much trouble.
You can also try encoding the string to hexadecimal. This will yield numbers although I'm not sure you can always come back from the encode string to the original string:
>>>s='abc'
>>>n=s.encode('hex')
>>>print n
'616263'
>>>n.decode('hex')
'abc'
If you need it to be actual integers then you can extend the trick:
>>>s='abc'
>>>n=int(s.encode('hex'), 16) #convert it to integer
>>>print n
6382179
hex(n)[2:].decode('hex') # return from integer to string
>>>abc
Note: I'm not sure this work out of the box in Python 3
UPDATE: To make it work with Python 3 I suggest using binascii module this way:
>>>import binascii
>>>s = 'abcd'
>>>n = int(binascii.hexlify(s.encode()), 16) # encode is needed to convert unicode to bytes
>>>print(n)
1633837924 #integer
>>>binascii.unhexlify(hex(n)[2:].encode()).decode()
'abcd'
encode and decode methods are needed to convert from bytes to string and the opposite. If you plan to include especial (non-ascii) characters then probably you'll need to specify encodings.
Hope this helps!
hexadecimals