Python in Basic 6 (spoiler)

[droogans]

I hate posting answers but honestly if you can use this you can look up the damn ascii chart.

Here's my question:

How can I dynamically append elements from a "for each in range(x)" sort of loop onto a string that has not yet been defined?

Example:

Code: Select all

encrypt = '5e9i=57m'

for each in range(len(encrypt)):
    pw += chr(ord(encrypt[each]) - each)

Traceback (most recent call last):
  File "<pyshell#154>", line 2, in <module>
    pw += chr(ord(encrypt[each]) - each)
NameError: name 'pw' is not defined

It worked once I went back and deliberately introduced pw

Code: Select all

pw = ''
for each in range(len(encrypt)):
    pw += chr(ord(encrypt[each]) - each)

Anyway, how can I avoid the pw = '' declaration? Is it possible?

Andrew

[mojo1948]

It's possible but defining pw is easier.

Code: Select all

encrypt = '5e9i=57m'
print ''.join([chr(x-y) for x,y in zip(map(ord,encrypt), range(0,len(encrypt)))])

[droogans]

Mojo -

You read my mind. My first stab at this was to map the list before the chr(ord()) call, but I used .join(' ') at the end.

You print the call to join, then do your work... I used the for loop to bring in my use of join, which I see here as unneeded.

Thanks for showing me this. I will probably never use your exact approach, as it is highly unreadable, but masking string manipulation within a list was my goal...and will help me in the future. I'll probably come up with a technique that's a little more intuitive than what I see here.

+1 to you,

Andrew

[mojo1948]

It's referred to as "list comprehension", it's part of Pythons implementation of functional style programming.
http://docs.python.org/howto/functional.html