Python 3 How to count the number of characters in a string?

Question

How to count the number of characters in a string? I need to get this "aabbcc from this "a2b2c2". I roughly understand that this should be a loop inside a loop.

Answer 1

What programming language will you use?
What you are asking for is a so called RLE (Run Length Encoded) conversion.

Answer 2

Dmitry Bezruchko, Thanks. It can be done by using loops with a counter, regex is also possible. A solution is also to use itertools groupby.

Answer 3

Dmitry Bezruchko, it still not total clear how the characters should be counted.

Input: "aabxcayyyfa" ( spaces are inserted for better readability)

(1) a4 b1 x1 c1 y3 f1 # this counted in the complete string
(2) a2 b1 x1 c1 a1 y3 f1 a1 # this is counted as consecutive characters

Is it like sample 1 or 2 or something else?

Answer 4

You may find answer in https://www.w3resource.com/JUMP_LINK__&&__python__&&__JUMP_LINK-exercises/string/python-data-type-string-exercise-2.php

Answer 5

Dmitry Bezruchko Show Ur attempt
And our community try to fix it

Answer 6

Here are some examples of Run Length Encoding.
some also show reverse.
https://www.sololearn.com/Discuss/1017933/?ref=app

#To get this "aabbcc from this "a2b2c2".

inp = 'a2b2c2d11e22'
print(inp)
alph = [k for k in inp if k.isalpha()]
num = [k for k in (''.join((m,' ')[m.isalpha()] for m in inp)).strip().split(' ')]
print(*[i*int(j) for i,j in zip(alph,num)],sep='')

Answer 7

Louis Thank you very much! My head already hurts from this task! I ran into a wall and cannot move on!

Answer 8

I am sorry! Python 3!

Answer 9

But the fact is that it is in Python! The point is how to do this with loops?

Answer 10

And how do you insert a link to the one you want to answer?

Answer 11

Abhay Lothar Jan Markus Hooray! I understand how to give a link! Thank you all very much for participating!

Answer 12

Jan Markus Heck! It is so simple! Thank you so much! I already broke my head!

Answer 13

Jan Markus But no! At first I was delighted, but then it turned out that if the characters are repeated then the code does not work. And they are repeated. How then to be?

Answer 14

Lothar Like in # 2

Answer 15

If like # 1, then adding to the dictionary works well. So suggested Jan Markus

Answer 16

Lothar So I asked how to do this using loops. But how? I do not understand!

Answer 17

By simply use len() function

Answer 18

As you mentioned Python,you can use len()
Eg.len(' abcd') will give 5 characters .You can definitely give it a try.

Answer 19

The function len("xyz......") can do that for you

Answer 20

in c language
you can use "strlen(variable name)" function
https://youtu.be/VMNdaevctMU
thanku