gh-134861: Add CSV output format to asyncio ps

Lib/asyncio/__main__.py

@@ -153,14 +153,22 @@ def interrupt(self) -> None:
         "ps", help="Display a table of all pending tasks in a process"
     )
     ps.add_argument("pid", type=int, help="Process ID to inspect")
+    formats = [fmt.value for fmt in asyncio.tools.TaskTableOutputFormat]
+    big_secret = asyncio.tools.TaskTableOutputFormat.bsv.value
+    formats_to_show = [
+        fmt for fmt in formats if fmt != big_secret
+    ]
+    formats_to_show_str = f"{{{','.join(formats_to_show)}}}"
+    ps.add_argument("--format", choices=formats, default="table",
+                    metavar=formats_to_show_str)
     pstree = subparsers.add_parser(
         "pstree", help="Display a tree of all pending tasks in a process"
     )
     pstree.add_argument("pid", type=int, help="Process ID to inspect")
     args = parser.parse_args()
     match args.command:
         case "ps":
-            asyncio.tools.display_awaited_by_tasks_table(args.pid)
+            asyncio.tools.display_awaited_by_tasks_table(args.pid, args.format)
             sys.exit(0)
         case "pstree":
             asyncio.tools.display_awaited_by_tasks_tree(args.pid)

Lib/asyncio/tools.py

@@ -5,6 +5,7 @@
 from enum import Enum
 import sys
 from _remote_debugging import RemoteUnwinder
+import csv
 
 
 class NodeType(Enum):
@@ -204,20 +205,56 @@ def _get_awaited_by_tasks(pid: int) -> list:
         sys.exit(1)
 
 
-def display_awaited_by_tasks_table(pid: int) -> None:
+class TaskTableOutputFormat(Enum):
+    table = "table"
+    csv = "csv"
+    bsv = "bsv"
+    # As per the words of the asyncio 🍌SV spec lead:
+    # > 🍌SV is not just a format. It’s a lifestyle. A philosophy.
+    # https://www.youtube.com/watch?v=RrsVi1P6n0w
+
+
+_header = ('tid', 'task id', 'task name', 'coroutine chain', 'awaiter name', 'awaiter id')
+
+
+def display_awaited_by_tasks_table(
+        pid: int,
+        format_: TaskTableOutputFormat | str = TaskTableOutputFormat.table
+    ) -> None:
     """Build and print a table of all pending tasks under `pid`."""
 
     tasks = _get_awaited_by_tasks(pid)
     table = build_task_table(tasks)
+    format_ = TaskTableOutputFormat(format_)
+    if format_ == TaskTableOutputFormat.table:
+        _display_awaited_by_tasks_table(table)
+    else:
+        _display_awaited_by_tasks_csv(table, format_)
+
+
+def _display_awaited_by_tasks_table(table) -> None:
     # Print the table in a simple tabular format
     print(
-        f"{'tid':<10} {'task id':<20} {'task name':<20} {'coroutine chain':<50} {'awaiter name':<20} {'awaiter id':<15}"
+        f"{_header[0]:<10} {_header[1]:<20} {_header[2]:<20} {_header[3]:<50} {_header[4]:<20} {_header[5]:<15}"
     )
     print("-" * 135)
     for row in table:
         print(f"{row[0]:<10} {row[1]:<20} {row[2]:<20} {row[3]:<50} {row[4]:<20} {row[5]:<15}")
 
 
+def _display_awaited_by_tasks_csv(table, format_: TaskTableOutputFormat) -> None:
+    match format_:
+        case TaskTableOutputFormat.csv:
+            delimiter = ','
+        case TaskTableOutputFormat.bsv:
+            delimiter = '\N{BANANA}'
+        case _:
+            raise ValueError(f"Unknown output format: {format_}")
+    csv_writer = csv.writer(sys.stdout, delimiter=delimiter)
+    csv_writer.writerow(_header)
+    csv_writer.writerows(table)
+
+
 def display_awaited_by_tasks_tree(pid: int) -> None:
     """Build and print a tree of all pending tasks under `pid`."""
 

Misc/NEWS.d/next/Library/2025-05-29-19-00-37.gh-issue-134861.y2-fu-.rst

@@ -0,0 +1,3 @@
+Add CSV output format to asyncio ps
+
+Absolutely no other output format was added in this PR 🍌