How to remove duplicates only if consecutive in a string? [duplicate]

Answer 1

Hint: the itertools module is super-useful. One function in particular, itertools.groupby, might come in really handy here:

itertools.groupby(iterable[, key])

Make an iterator that returns consecutive keys and groups from the iterable. The key is a function computing a key value for each element. If not specified or is None, key defaults to an identity function and returns the element unchanged. Generally, the iterable needs to already be sorted on the same key function.

So since strings are iterable, what you could do is:

use groupby to collect neighbouring elements
extract the keys from the iterator returned by groupby
join the keys together

which can all be done in one clean line..

Answer 2

number = '12233322155552'
temp_list = []


for item in number:   
   if len(temp_list) == 0:
      temp_list.append(item)

   elif len(temp_list) > 0:
      if  temp_list[-1] != item:
          temp_list.append(item)

print(''.join(temp_list))

Answer 3

This would be a way:

def fix(a):
    list = []

    for element in a:
        # fill the list if the list is empty
        if len(list) == 0:list.append(element)
        # check with the last element of the list
        if list[-1] != element:  list.append(element)

    print(''.join(list))    


a= 'GGGGiiiiniiiGinnaaaaaProtijayi'
fix(a)
# output => GiniGinaProtijayi

Answer 4

First of all, you can't remove anything from a string in Python (google "Python immutable string" if this is not clear).

M first approach would be:

foo = '12233322155552'
bar = ''
for chr in foo:
    if bar == '' or chr != bar[len(bar)-1]:
        bar += chr

or, using the itertools hint from above:

''.join([ k[0] for k in groupby(a) ])

Answer 5

import re

# Only repeated numbers
answer = re.sub(r'(\d)\1+', r'\1', '12233322155552')

# Any repeated character
answer = re.sub(r'(.)\1+', r'\1', '12233322155552')

Answer 6

t = '12233322155552'
for i in t:
    dup = i+i
    t = re.sub(dup, i, t)

You can get final output as 1232152