CODEWITHSUNDEEP
pythonfor-loop
benzlock
benzlock

Reputation: 9

Variable + 1 in for loops

I have a block of text with the format 'abc,def,ghi,jkl, etc' I need to turn each 3-digit bit into something else, in this case a letter. However, using a for loop, I can't find a way of looking beyond the current character. I'm looking for something a little like this:

for char in message[::4]:
   if char == 'a':
      if char(+1) == 'b':
         newmessage += 1

I'd prefer to use a for loop, but if there's no way of doing it, a while loop would be fine too.

Upvotes: 0

Views: 74

Answers (4)

Padraic Cunningham
Padraic Cunningham

Reputation: 180411

for word in message.split(","):
    for ind, char in enumerate(word[:-1], 1):
        if char == 'a' and word[ind] == "b":
            newmessage += 1

If you want the sum use a generator expression with sum:

new_message = sum(char == 'a' and word[ind] == "b" for word in message.split(",")
                  for ind, char in enumerate(word[:-1], 1))

Upvotes: 1

tom
tom

Reputation: 2365

for x in message.split(','):
    if x == "abc":
        # do something

Upvotes: 1

Amy Teegarden
Amy Teegarden

Reputation: 3972

for i, char in enumerate(message[::4]):
    if char == 'a':
        if message[i * 4 + 1] == 'b':
            newmessage += 1

Upvotes: 0

301_Moved_Permanently
301_Moved_Permanently

Reputation: 4186

Use enumerate:

for index, char in enumerate(message[::4]):
    if char == 'a':
        if message[index + 1] == 'b':
            newmessage += 1

Upvotes: 0

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