Are lexers and parsers really that different in theory? It seems fashionable to hate regular expressions: coding horror, another blog post. However, popular lexing based tools: …

I would like to use argparse to parse boolean command-line arguments written as "--foo True" or "--foo False". For example: my_program --my_boolean_flag False However, the following test …

May 29, 2010 · A parser for that language would accept AABB input and reject the AAAB input. That is what a parser does. In addition, during this process a data structure could be created …

Mar 28, 2018 · 201 I am looking for a clear definition of what a "tokenizer", "parser" and "lexer" are and how they are related to each other (e.g., does a parser use a tokenizer or vice versa)? …

Jun 5, 2015 · A parser is a compiler / interpreter component that breaks data into smaller elements for easy translation into another language. A parser takes input in the form of a …

Sep 11, 2011 · How do I go about writing a Parser (Recursive Descent?) in C#? For now I just want a simple parser that parses arithmetic expressions (and reads variables?). Though later I …

Dec 17, 2009 · A parser would check for the syntax of sentences being correct, though. And the lexer might already look into a dictionary to see whether the words are made up or are indeed …

I have this code so far: import argparse parser = argparse.ArgumentParser() parser.add_argument("-g", "--games", type=int, default=162, help="The number of games to …

I was hoping to use it to group subcommands. @MinhTran You would need to use a_parser.add_subparsers() and b_parser.add_subparsers() in that case. @chepner something …

I want to accept a directory path as user input in an add_argument() of ArgumentParser(). So far, I have written this: import argparse parser = argparse.ArgumentParser() …