This article explains the Backus–Naur Form (BNF) notation, its core components, and how to use it to describe Python grammar, providing concrete examples such as full‑name definitions, identifiers, and control‑flow statements, along with best‑practice tips for reading Python BNF rules.
This article guides readers through designing and implementing a basic Python interpreter that can evaluate arithmetic expressions by defining tokens, writing a lexer and parser with PLY, specifying BNF grammar, handling precedence, and assembling a runnable program that processes user input.
The article walks readers through building a custom scripting language from scratch—explaining compilation basics, lexical scanning, parsing, bytecode generation, and virtual‑machine execution—using a sample language called eben to illustrate BNF syntax, variable scopes, control flow, functions, closures, object‑orientation, garbage collection, and the historical evolution of programming languages.
This article walks through creating a Python arithmetic interpreter with the PLY library, covering token definitions, lexer rules, BNF grammar, parser implementation, operator precedence, and a runnable REPL, providing complete code and explanations for each step.
This article explains how to create a simple arithmetic expression interpreter in Python by leveraging the PLY (Python Lex‑Yacc) library, covering token definition, lexer implementation, BNF grammar, parser rules, operator precedence, error handling, and a complete runnable example.
