On 27/04/13 20:31, Jim Mooney wrote:
Okay, I tried enumerate, but now I get an "immutable" error. So let's
turn this around since it's getting out of hand for a simple list
replacement ;') What's the simplest way to go through a list, find
something, and replace it with something else?
vowels = 'aeiouy'
vlist = enumerate(vowels)
Let's see what that does:
py> print(vlist)
<enumerate object at 0xb7bcdb6c>
That's your first clue that something is wrong. There's no list! So when
you get your index later on, what do you change? You can't write back to
vowels, because that's a string and can't be modified.
Nevermind, let's keep going...
for x in vlist:
So what's x? It's a tuple, and tuples are immutable. So you can't modify
that either.
if x[1] == 'e':
x[0] = 'P'
That can't work, and even if it did work, it won't modify vowels, because
that's a string.
The right way to do this is:
vowels = list('aeiouy') # y is only sometimes a vowel
for index, char in enumerate(vowels):
if char == 'e':
vowels[index] = 'P'
print(vowels) # still as a list
print(''.join(vowels))
--
Steven
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