CODEWITHSUNDEEP
pythonstringlist
Yarden
Yarden

Reputation: 679

Turning a string into a list with specifications

I want to create a list out of my string in python that would show me how many times a letter is shown in a row inside the string. for example:

my_string= "google"

i want to create a list that looks like this:

[['g', 1], ['o', 2], ['g', 1], ['l', 1], ['e', 1]]

Thanks!

Upvotes: 2

Views: 168

Answers (2)

Junuxx
Junuxx

Reputation: 14271

You can use a regular expression and a dictionary to find and store the longest string of each letter like this

s = 'google'
nodubs = [s[0]] + [s[x] if s[x-1] != s[x] else '' for x in range(1,len(s))]
nodubs = ''.join(nodubs)
import re
dic = {}
for letter in set(s):
    matches = re.findall('%s+' % letter, s)
    longest = max([len(x) for x in matches])
    dic[letter] = longest

print [[n,dic[n]] for n in nodubs]

Result:

[['g', 1], ['o', 2], ['g', 1], ['l', 1], ['e', 1]]

Upvotes: 0

Oleksandr Lysenko
Oleksandr Lysenko

Reputation: 304

You could use groupby from itertools:

from itertools import groupby
my_string= "google"
[(c, len(list(i))) for c, i in groupby(my_string)]

Upvotes: 8

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