Chemistry calculator in Python

Question

How to convert chem. formula into math. formula?
E.g.: C6H12O6 --> C*6 + H*12 + O*6

Answer 1

Thank you, Vijay and Qasem! I planned to use regexps. But there is no need to import re.

Answer 2

You can traverse whole string and whenever you get integer(character from 0-9) insert '*' at that position ( in a new string), when you switch integer to char insert '+'
For example- when you traverse given string "C7H12O6", first you will encounter 'C' so append this into new string, after that you will encounter '6' that is an integer( digit from 0 to 9) So you will first append '*' and after that append '6'. After this you will get 'H' ( switch from digit to char) here append '+' and after it append 'H'. Keep going this way until you reach at the end of string. In this way you will get a new string "C*6+H*12+O*6".
Note- Here all things are in string form not in integer because string-integer doesn't support arithmetic (mathematical) operations.

Answer 3

https://code.sololearn.com/cXafiPd7iGAh/?ref=app