Encoding

[shing]

a='$'
b='i'
c='q'
d='s'
e='w'
f='~'
g='d'
h='2'
i='5'
j='6'
k='a'
l='g'
m='-'
n='j'
o='z'
p='%'
q='h'
r='9'
s='f'
t='7'
u='+'
v='c'
w='0'
x='8'
y='7'
z='x'

while True:
    guess = raw_input("Word or Exit?")
    if guess.lower() == 'exit':
              break
    elif guess.lower() == 'Word':

	print code

I'm not so sure as how to finish my program. I want the python script to show something like: q$7 after I type in "cat". All help appreciated if anybody can help me on this,

[Elias Alhanatis]

Hello there!!!

I am a newbee also , but as far as i can tell , you should put all your 'encoding'
( 'a'=....., 'b'=... etc ) in a list or even better in a dictionary , and then have the program to look up to that list or dict , and compose a string from the values that correspond to the letters you've entered.
It is supposed to be a simple task in Python..... ( if you work your way through the basics , of course....)

Happy coding ,

Elias

[Elias Alhanatis]

Here is the code. Just adopt it to your needs....

### This is a dictionary...
MyDict={'a':'$','b':'i','c':'q','d':'s','e':'w','f':'~','g':'d','h':'2',
        'i':'5','j':'6','k':'a','l':'g','m':'-','n':'j','o':'z','p':'%',
        'q':'h','r':'9','s':'f','t':'7','u':'+','v':'c','w':'0','x':'8',
        'y':'7','z':'x'}

## This is just to show the mapping of the 'encoding'
for k,v in MyDict.iteritems():
    print k,' will be encoded to.. ',v
    
## Here we ask for the word to be encoded
## Notice that i use the '.lower' method in case
##    the user inserts any uppercase letters
    
Word=raw_input("What is the word you want to encode?").lower()

## This is an empty string to begin with
Encoded_Word=''

## Now we iterate over the inserted word to check each letter
for letter in Word:
    if MyDict.has_key(letter):
        ## Insert to the string the coresponding character..
        Encoded_Word=Encoded_Word+MyDict.get(letter)

## Print the encoded word
print Encoded_Word

## Or , if you want even more details...
print 'The word',Word,' was encoded to..',Encoded_Word

Hope i helped!!!!

Elias

[elcron]

I recommend using the string module. Here's an example for caesar shift 2:
[code=python]
import string
def shift(text):
"""
caesar shift 2
"""
# the 0 index of inputt will be mapped to the 0 index of output ...
inputt = 'abcdefghijklmn opqrstuvwxyz'
output = 'cdefghijklmnop qrstuvwxyzab'

# the actual mapping
table = string.maketran s(inputt, output)

# translating the text
result = string.translat e(text, table)

return result
[/code]

[Motoma]

Fantastic solution elcron. I did not know that the string module had this capability.

[ghostdog74]

you can use other encoding as well, some examples

>>> "string".encode("rot13")
'fgevat'
>>> "string".encode("zip")
'x\x9c+.)\xca\xccK\x07\x00\tB\x02\x98'
>>> "string".encode("uu")
'begin 666 <data>\n&<W1R:6YG\n \nend\n'
>>> "string".encode("base64")
'c3RyaW5n\n'
>>>

[shing]

That's a great script you've got Elias, do you think you could add in the "Space bar"? Bartonc's seems good too, but I'm afraid he's too complicated for me to understand it :P

[Elias Alhanatis]

Of course you can add a "Space Bar". If you want for example
the spaces to be translated to asteriscs (*), just add to "MyDict"
the following : ' ':'*'
(Notice that betwen the first two ' i have a space.... )

As an advice for the future , i would recomend that you try to
experiment!!! Take small pieces of code , try to modify them
( a bit at a time ) and see how they work. See what results
your changes have brought , and you will be able to fully
understand how everything works.

Happy Coding!!!

Elias

[shing]

Hey elias i tried switching around some of your code to make a decoder, but that seems to come up with errors...

### This is a dictionary...
MyDict={'a':'$','b':'i','c':'q','d':'s','e':'w','f':'~','g':'d','h':'2',
        'i':'5','j':'6','k':'a','l':'g','m':'-','n':'j','o':'z','p':'%',
        'q':'h','r':'9','s':'f','t':'7','u':'+','v':'c','w':'0','x':'8',
        'y':'7','z':'x'}

## This is just to show the mapping of the 'encoding'
for k,v in MyDict.iteritems():
    print v,' will be decoded to.. ',k
    
## Here we ask for the word to be decoded
## Notice that i use the '.lower' method in case
##    the user inserts any uppercase letters
    
Word=raw_input("What is the word you want to decode?").lower()

## This is an empty string to begin with
Decoded_Word=''

## Now we iterate over the inserted word to check each letter
for letter in Word:
    if MyDict.has_key(letter):
        ## Insert to the string the coresponding character..
        Decoded_Word+MyDict=Decoded_Word.get(letter)

## Print the encoded word
print Decoded_Word

Any ideas?

[Stubert]

Hey I know nothing of Python but maybe one of your errors is coming from the declaration of the letter 'f' in your dictionary, you've only used one ' and not closed it.

[Elias Alhanatis]

And also check again line 24 of your code , i think you have mixed up things
a liitle bit there...

Be very carefull and double-check everything in your code. Also read carefully from the error report in which line was the error. If no error comes from the program , and you just get strange results , check again your code. Computers are never wrong ,
people are!!!

Elias

[bvdet]

Hey elias i tried switching around some of your code to make a decoder, but that seems to come up with errors...

### This is a dictionary...
MyDict={'a':'$','b':'i','c':'q','d':'s','e':'w','f':'~','g':'d','h':'2',
        'i':'5','j':'6','k':'a','l':'g','m':'-','n':'j','o':'z','p':'%',
        'q':'h','r':'9','s':'f','t':'7','u':'+','v':'c','w':'0','x':'8',
        'y':'7','z':'x'}

## This is just to show the mapping of the 'encoding'
for k,v in MyDict.iteritems():
    print v,' will be decoded to.. ',k
    
## Here we ask for the word to be decoded
## Notice that i use the '.lower' method in case
##    the user inserts any uppercase letters
    
Word=raw_input("What is the word you want to decode?").lower()

## This is an empty string to begin with
Decoded_Word=''

## Now we iterate over the inserted word to check each letter
for letter in Word:
    if MyDict.has_key(letter):
        ## Insert to the string the coresponding character..
        Decoded_Word+MyDict=Decoded_Word.get(letter)

## Print the encoded word
print Decoded_Word

Any ideas?

This reverses the dictionary:[code=Python]
revDict = dict(zip(MyDict .values(), MyDict.keys()))
Decoded_Word = ''.join([revDict.get(let ter, letter) for letter in Encoded_Word])
print Decoded_Word[/code]This works well and is good exercise, but I prefer the string.maketran s() - string.translat e() solution.

[shing]

says that the encoded word is not defined.

### This is a dictionary...
MyDict={'a':'$','b':'i','c':'q','d':'s','e':'w','f':'~','g':'d','h':'2',
        'i':'5','j':'6','k':'a','l':'g','m':'-','n':'j','o':'z','p':'%',
        'q':'h','r':'9','s':'f','t':'7','u':'+','v':'c','w':'0','x':'8',
        'y':'7','z':'x'}

## This is just to show the mapping of the 'encoding'
for k,v in MyDict.iteritems():
    print v,' will be decoded to.. ',k
    
## Here we ask for the word to be decoded
## Notice that i use the '.lower' method in case
##    the user inserts any uppercase letters
    
Word=raw_input("What is the word you want to decode?").lower()

## This is an empty string to begin with
Decoded_Word=''

revDict = dict(zip(MyDict.values(), MyDict.keys()))
Decoded_Word = ''.join([revDict.get(letter, letter) for letter in Encoded_Word])
print Decoded_Word

[Elias Alhanatis]

Change line 15 to:

Encoded_Word=ra w_input("What is the word you want to decode?").lower ()