Add argparse benchmarks for subparsers and many optionals (#367)

* Add argparse benchmark

* Add benchmark for testing lots of args

* Reorder in MANIFEST

* Fix formatting

* Add newline

* Formatting

* Update description

* Formatting...again

* Update docstring

* Attempting to fix the tests

* Remove line

* Refactor into single run_benchmark

* Add newline;

* Remove extraneous files

* Formatting :)

Author: savannahostrowski

pyperformance/data-files/benchmarks/MANIFEST

@@ -2,6 +2,8 @@
 
 name	metafile
 2to3	<local>
+argparse	<local>
+argparse_subparsers	<local:argparse>
 async_generators	<local>
 async_tree	<local>
 async_tree_cpu_io_mixed	<local:async_tree>

pyperformance/data-files/benchmarks/bm_argparse/bm_argparse_subparsers.toml

@@ -0,0 +1,10 @@
+[project]
+name = "pyperformance_bm_argparse"
+requires-python = ">=3.8"
+dependencies = ["pyperf"]
+urls = {repository = "https://github.com/python/pyperformance"}
+dynamic = ["version"]
+
+[tool.pyperformance]
+name = "argparse_subparsers"
+extra_opts = ["subparsers"]

pyperformance/data-files/benchmarks/bm_argparse/pyproject.toml

@@ -0,0 +1,10 @@
+[project]
+name = "pyperformance_bm_argparse"
+requires-python = ">=3.8"
+dependencies = ["pyperf"]
+urls = {repository = "https://github.com/python/pyperformance"}
+dynamic = ["version"]
+
+[tool.pyperformance]
+name = "argparse_many_optionals"
+extra_opts = ["many_optionals"]

pyperformance/data-files/benchmarks/bm_argparse/run_benchmark.py

@@ -0,0 +1,125 @@
+"""
+Benchmark argparse programs with:
+1) multiple subparsers, each with their own subcommands, and then parse a series of command-line arguments.
+2) a large number of optional arguments, and then parse a series of command-line arguments.
+
+Author: Savannah Ostrowski
+"""
+
+import argparse
+import pyperf
+
+
+def generate_arguments(i: int) -> list:
+    arguments = ["input.txt", "output.txt"]
+    for i in range(i):
+        arguments.extend([f"--option{i}", f"value{i}"])
+    return arguments
+
+
+def bm_many_optionals() -> argparse.ArgumentParser:
+    parser = argparse.ArgumentParser(description="A version control system CLI")
+
+    parser.add_argument("--version", action="version", version="1.0")
+
+    subparsers = parser.add_subparsers(dest="command", required=True)
+
+    add_parser = subparsers.add_parser("add", help="Add a file to the repository")
+    add_parser.add_argument("files", nargs="+", help="List of files to add to staging")
+
+    commit_parser = subparsers.add_parser(
+        "commit", help="Commit changes to the repository"
+    )
+    commit_parser.add_argument("-m", "--message", required=True, help="Commit message")
+
+    commit_group = commit_parser.add_mutually_exclusive_group(required=False)
+    commit_group.add_argument(
+        "--amend", action="store_true", help="Amend the last commit"
+    )
+    commit_group.add_argument(
+        "--no-edit", action="store_true", help="Reuse the last commit message"
+    )
+
+    push_parser = subparsers.add_parser(
+        "push", help="Push changes to remote repository"
+    )
+
+    network_group = push_parser.add_argument_group("Network options")
+    network_group.add_argument("--dryrun", action="store_true", help="Simulate changes")
+    network_group.add_argument(
+        "--timeout", type=int, default=30, help="Timeout in seconds"
+    )
+
+    auth_group = push_parser.add_argument_group("Authentication options")
+    auth_group.add_argument(
+        "--username", required=True, help="Username for authentication"
+    )
+    auth_group.add_argument(
+        "--password", required=True, help="Password for authentication"
+    )
+
+    global_group = parser.add_mutually_exclusive_group()
+    global_group.add_argument("--verbose", action="store_true", help="Verbose output")
+    global_group.add_argument("--quiet", action="store_true", help="Quiet output")
+
+    argument_lists = [
+        ["--verbose", "add", "file1.txt", "file2.txt"],
+        ["add", "file1.txt", "file2.txt"],
+        ["commit", "-m", "Initial commit"],
+        ["commit", "-m", "Add new feature", "--amend"],
+        [
+            "push",
+            "--dryrun",
+            "--timeout",
+            "60",
+            "--username",
+            "user",
+            "--password",
+            "pass",
+        ],
+    ]
+
+    for arguments in argument_lists:
+        parser.parse_args(arguments)
+
+
+def bm_subparsers() -> argparse.ArgumentParser:
+    parser = argparse.ArgumentParser()
+
+    parser.add_argument("input_file", type=str, help="The input file")
+    parser.add_argument("output_file", type=str, help="The output file")
+
+    for i in range(1000):
+        parser.add_argument(f"--option{i}", type=str, help=f"Optional argument {i}")
+
+    argument_lists = [
+        generate_arguments(500),
+        generate_arguments(1000),
+    ]
+
+    for args in argument_lists:
+        parser.parse_args(args)
+
+
+BENCHMARKS = {
+    "many_optionals": bm_many_optionals,
+    "subparsers": bm_subparsers,
+}
+
+
+def add_cmdline_args(cmd, args):
+    cmd.append(args.benchmark)
+
+
+def add_parser_args(parser):
+    parser.add_argument("benchmark", choices=BENCHMARKS, help="Which benchmark to run.")
+
+
+if __name__ == "__main__":
+    runner = pyperf.Runner(add_cmdline_args=add_cmdline_args)
+    runner.metadata["description"] = "Argparse benchmark"
+    add_parser_args(runner.argparser)
+    args = runner.parse_args()
+    benchmark = args.benchmark
+
+    runner.bench_func(args.benchmark, BENCHMARKS[args.benchmark])