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Grokking the Coding Interview Patterns in Python

Basic Calculator

Explore how to implement a basic calculator that evaluates arithmetic expressions containing integers, plus and minus operators, and parentheses. Learn to apply stack data structures to parse and compute results without using built-in eval functions, improving your understanding of expression evaluation and stack manipulation.

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Statement

Given a string containing an arithmetic expression, implement a basic calculator that evaluates the expression string. The expression string can contain integer numeric values and should be able to handle the “+” and “-” operators, as well as “()” parentheses.

Constraints:

Let s be the expression string. We can assume the following constraints:

  • 1≤1 \leq s.length ≤3×103\leq 3 \times 10^{3}
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