How add "." before each letter in string

Question

as title says i simply need to add a . before each letter in my string while having vowels removed and making it lowercase i got it working just cant add the .s there here is my code

s = str(input())
vowels = ('a','e','o','u','i','A','E','O','U','I')
for letter in s:
    if letter in vowels:
        s = s.replace(letter,'').replace()
print(s)

Possible duplicate of [Put a symbol before and after each character in a string](https://stackoverflow.com/questions/21554740/put-a-symbol-before-and-after-each-character-in-a-string) — Georgy, Oct 05 '18 at 08:11
@WillemVanOnsem hint: don't use a regexp ;-) (you don't need it) — bruno desthuilliers, Oct 05 '18 at 09:09
@brunodesthuilliers: well the nice thing about regexes (given these are well implemented) is that these use dynamic programming, and thus can convert an *O(m n)* approach, into an *O(m+n)* approach :) — Willem Van Onsem, Oct 05 '18 at 09:10

Austin · Answer 1 · 2018-10-05T08:45:43.420

8

Use:

s = input()
vowels = set('aeoui')

print(''.join([f'.{x}' for x in s.lower() if x not in vowels]))

Sample run:

Hello
.h.l.l

edited Oct 05 '18 at 08:45

answered Oct 05 '18 at 08:11

Austin

25,759
4
25
48

Simpler: `print('.'.join(x for x in s if x not in vowels))` – Daniel Roseman Oct 05 '18 at 08:18

score 1 · Answer 2 · answered Oct 05 '18 at 08:30

All other answers will insert a . in front of every character in the string, but you specified that you want letters only. So I am assuming that you only want a-z to be prepended with a . for which I suggest re.sub:

import re
s = "This is some test string. It contains some symbols also ()!!"
result = re.sub('[aeoui]', '', s.lower())  # remove vowels and make lowercase
result = re.sub("([a-z])", r".\1", result)  # prepend '.' to every letter
print(result)

Outputs:

.t.h.s .s .s.m .t.s.t .s.t.r.n.g. .t .c.n.t.n.s .s.m .s.y.m.b.l.s .l.s ()!!

RemyM · Accepted Answer · 2018-10-05T08:42:43.030

-1

You can do it step by step:

Replace all the vowels in the string with ''

for i in s:
    for j in vowels:
        s=s.replace(j,'')

Convert the string into lowercase:

s=s.lower()

Adding '.' in between each letters:

s='.' + '.'.join(s)

edited Oct 05 '18 at 08:42

answered Oct 05 '18 at 08:18

RemyM

168
1
8

Does not work for the first letter. OP needs a dot before every letter if I read the title correctly. – Austin Oct 05 '18 at 08:38
Edited it for the first letter :) – RemyM Oct 05 '18 at 08:43

How add "." before each letter in string

3 Answers3