Freedom Peacemaker wrote:
> Hi,
> main idea was to :
> - get random characters word
> - randomly colour letters in my word
> - from this coloured word print all yellow letters
>
> As it is random i need to be sure that at least one letter is yellow so i
> put yellow color into final variable.
Why?
> This code works but randomly
> generates error. And i have no idea how solve this problem. Please help me
>
> Traceback (most recent call last):
> File "proj3", line 23, in <module>
> w = "".join((colorpass[i.end()]) for i in re.finditer(re.escape(Y),
> colorpass))
> File "proj3", line 23, in <genexpr>
> w = "".join((colorpass[i.end()]) for i in re.finditer(re.escape(Y),
> colorpass))
> IndexError: string index out of range
>
> This is my code:
>
> from random import choice
> from string import ascii_letters, digits
> import re
>
> chars = ascii_letters + digits
>
> word = "".join([choice(chars) for i in range(10)])
>
> R = '\033[31m' # red
> G = '\033[32m' # green
> B = '\033[34m' # blue
> P = '\033[35m' # purple
> Y = '\033[93m' # yellow
>
> colors = [R, G, B, P, Y]
>
> colorpass = "\033[93m"
> for char in word:
> colorpass += char + choice(colors)
The character is followed by the color-code sequence. If the last color is
yellow re.end() == len(colorpos) which is not a valid index into the string.
> print(colorpass)
>
> w = "".join((colorpass[i.end()]) for i in re.finditer(re.escape(Y),
> colorpass))
> print(w)
>
> I am using Python 3.5.2 on Ubuntu 16.04
To print a colored character you have to put the color sequence before it,
so I'd do just that. Here's an example without regular expressions:
word = "".join(choice(chars) for i in range(10))
colored_word = "".join(choice(colors) + c for c in word)
yellow_chars = "".join(part[0] for part in colored_word.split(Y)[1:])
print(word)
print(colored_word)
print("\033[0m", end="")
print(yellow_chars)
As we know that at least one character follows the color it is OK to write
part[0] above. If that's not the case it's easy to avoid the exception by
using part[:1] as that works for the empty string, too:
>>> "foo"[:1]
'f'
>>> ""[:1]
''
_______________________________________________
Tutor maillist - Tutor@python.org
To unsubscribe or change subscription options:
https://mail.python.org/mailman/listinfo/tutor
