Converting '1a2b3c' string to Dictionary

[PythonNoobLvl1]

Hello, I'm currently in school for computer science, graduating next year and I've been browsing some of the leetcode problems. I was a bit disheartened as when I read some of the answers it looks like I'm reading a foreign language. I've been trying to give myself simple problems so I can get comfortable converting different types of data to dictionaries, I still have a few classes to take but have not really worked with them. What I've been trying to do is convert the string '1a2a3c' into a dictionary {1 : a, 2 : b, 3 : c} using a for a loop. Eventually, I want to create a function that does this. So far I've only been able to come up with this

s = '1a2b3c' 
keys = []
keys[:0] = s
dic = {}
for i in keys:
    if (keys.index(i) % 2) == 0:
        dic[keys[i]] = keys[i + 1]

But when I try to run this I get the error

Error:
Traceback (most recent call last):
  File "<string>", line 7, in <module>
TypeError: can only concatenate str (not "int") to str

Does anyone know what I'm doing wrong?

Larz60+ write May-12-2022, 06:09 PM:
Please post all code, output and errors (it it's entirety) between their respective tags. Refer to BBCode help topic on how to post. Use the "Preview Post" button to make sure the code is presented as you expect before hitting the "Post Reply/Thread" button.
Fixed for you this time. Please use BBCode tags on future posts.