Python

Python argparse General Use Guide argparse is Python’s standard library module for creating command-line interfaces. It’s a powerful tool for parsing command-line arguments and generating help messages. Basic Usage Pattern 1import argparse 2 3# 1. Create the parser 4parser = argparse.ArgumentParser(description='Description of your program') 5 6# 2. Add arguments 7parser.add_argument('--foo', help='foo help') 8parser.add_argument('bar', help='bar help') 9 10# 3. Parse the arguments 11args = parser.parse_args() 12 13# 4. Use the arguments 14print(args.foo) 15print(args.bar) Adding Arguments Positional Arguments 1parser.add_argument('filename', help='name of the file to process') Optional Arguments 1parser.add_argument('--verbose', '-v', help='increase output verbosity', action='store_true') Common Argument Types 1# String (default) 2parser.add_argument('--name', type=str, help='person name') 3 4# Integer 5parser.add_argument('--age', type=int, help='person age') 6 7# Float 8parser.add_argument('--price', type=float, help='item price') 9 10# Boolean flags 11parser.add_argument('--enable', action='store_true', help='enable feature') 12parser.add_argument('--disable', action='store_false', help='disable feature') 13 14# Choices 15parser.add_argument('--color', choices=['red', 'green', 'blue'], help='color choice') 16 17# Multiple values 18parser.add_argument('--numbers', nargs='+', type=int, help='list of numbers') Advanced Options 1# Required arguments 2parser.add_argument('--required-arg', required=True, help='this argument is required') 3 4# Default values 5parser.add_argument('--delay', type=int, default=10, help='delay in seconds') 6 7# Custom actions 8parser.add_argument('--version', action='version', version='%(prog)s 1.0') 9 10# Argument groups 11group = parser.add_argument_group('authentication') 12group.add_argument('--username', help='username') 13group.add_argument('--password', help='password') Parsing and Using Arguments 1args = parser.parse_args() 2 3# Access argument values 4if args.verbose: 5 print("Verbose mode enabled") 6 7if args.filename: 8 process_file(args.filename) Subcommands For complex CLI tools with multiple commands (like git): ...

1. Where to Set output_dir for pybind11-stubgen? The output_dir is where the generated .pyi file will be saved. It does not affect Python’s ability to import the module—the .pyi file is just for type hints and documentation (used by IDEs like VSCode/PyCharm). Example 1pybind11-stubgen my_module -o ./stubs This generates ./stubs/my_module.pyi. Python will still import my_module from wherever the .so file is located (e.g., build/lib.linux-x86_64-3.8/). 2. How to Specify .so Output Directory in CMake? In your CMakeLists.txt, you can control where the .so file is built using: ...