How to code in Python?

Part III: Matching Brackets (20 points) Write a function brackets (expr) that takes a string consisting only of the symbols (). t.. I and ] and analyzes the string to make sure that the brackets are all "balanced" (matched) properly. For example the strings 01O1' and COf))1)'contain balanced brackets, whereasO O)) and (O)' are unbalanced. We refer to (, and [ as "left brackets", and), ) and ] as "right brackets". The basic algorithm to implement works like this: input: a string s output: a list L for each character in S if the character is a left bracket