CODEWITHSUNDEEP
pythonstringlistfor-loopalternate
LeftyRPZ
LeftyRPZ

Reputation: 31

How can you sort a string backwords, by vowels and consonant?

So I have to create a program that rewrites a string backword and alternates vowels and consonants like in this example: 

ex_1: 
input ->  'abcdefi'
output -> 'ifedacb'
ex_2:
input -> 'vblsdeloai'
output ->'iladoselbv'

What I did so far:

word = input('the word is: ')
b = word[::-1]
list_vowels = []
list_consonants = []
final_list = []
string = ''
vowels = ['a', 'e','i','o','u']
for i in str(b):
   if i in vowels:
       list_vowels.append(i)
   elif i not in vowels:
       list_consonants.append(i)

part where I'm stuck

for j in list_vowels :
    final_list.append(j)
for b in list_consonants :  
   final_list.append(b)

converts my final list into a string

for q in e
    string = string + e
print (string)

so I convert the string backwords than I use a for to iterate over every char and compare it to the vowel list. If it is in the vowel list then append to a new list list_vowels if not append it to a new list list_consonants. Now I'm stuck at the part where I have to create a list that is created by the two list list_vowels and list_consonats. I don't now how can I make the two for work simultaniously. The zip functions make the list a tuple and I don't think I can use that. I'm prety new and any help will be awsome. If you think I can aproach this problem differently feel free to tell me I am new to programing and I don't realy now how.

Upvotes: 2

Views: 1231

Answers (3)

Nick Lee
Nick Lee

Reputation: 5959

from itertools import zip_longest

def split(s):
    vowels = ['a', 'e', 'i', 'o', 'u']
    return list(filter(lambda c: c in vowels, s)), \
           list(filter(lambda c: c not in vowels, s))

def reverse_interleave(s):
    vowels, consonants = list(map(reversed, split(s)))
    return ''.join(
        map(lambda x: ''.join(x), 
            zip_longest(vowels, consonants, fillvalue='')))

print(reverse_interleave('abcdefi'))
print(reverse_interleave('vblsdeloai'))

  1. Split the characters into vowels and non-vowels.

  2. Reverse them.

  3. Interleave them using zip_longest() in this case.

Upvotes: 1

Nicolas Gervais
Nicolas Gervais

Reputation: 36684

The line you're missing is turning your two list of 1) vowels and 2) consonants into a zipped string. You can do this with itertools.zip_longest().

This is the line you will need:

from itertools import zip_longest

''.join(''.join(x) for x in zip_longest(list_vowels, list_consonants, fillvalue=''))

In[1]: 'vblsdeloai'

Out[1]: 'iladoselbv'

Upvotes: 1

Austin
Austin

Reputation: 26037

You need itertools.zip_longest to zip through two lists taking an empty string as fillvalue:

''.join(map(lambda x: x[0] + x[1], zip_longest(list_vowels, list_consonants, fillvalue='')))

Code:

from itertools import zip_longest

word = input('the word is: ')
b = word[::-1]
list_vowels = []
list_consonants = []
final_list = []
string = ''
vowels = ['a', 'e','i','o','u']

for i in b:
   if i in vowels:
       list_vowels.append(i)
   elif i not in vowels:
       list_consonants.append(i)

print(''.join(map(lambda x: x[0] + x[1], zip_longest(list_vowels, list_consonants, fillvalue=''))))

Upvotes: 1

Related Questions