python: Use trailing commas consistently.

Automatically generated by the following script, based on the output
of lint with flake8-comma:

import re
import sys

last_filename = None
last_row = None
lines = []

for msg in sys.stdin:
    m = re.match(
        r"\x1b\[35mflake8    \|\x1b\[0m \x1b\[1;31m(.+):(\d+):(\d+): (\w+)", msg
    )
    if m:
        filename, row_str, col_str, err = m.groups()
        row, col = int(row_str), int(col_str)

        if filename == last_filename:
            assert last_row != row
        else:
            if last_filename is not None:
                with open(last_filename, "w") as f:
                    f.writelines(lines)

            with open(filename) as f:
                lines = f.readlines()
            last_filename = filename
        last_row = row

        line = lines[row - 1]
        if err in ["C812", "C815"]:
            lines[row - 1] = line[: col - 1] + "," + line[col - 1 :]
        elif err in ["C819"]:
            assert line[col - 2] == ","
            lines[row - 1] = line[: col - 2] + line[col - 1 :].lstrip(" ")

if last_filename is not None:
    with open(last_filename, "w") as f:
        f.writelines(lines)

Signed-off-by: Anders Kaseorg <anders@zulipchat.com>

tools/setup/emoji/export_emoji_names_to_csv

@@ -89,7 +89,7 @@ def main() -> None:
 
     args = parser.parse_args()
     prepare_sorting_info()
-    output_data = [column_names, ]
+    output_data = [column_names]
     explanation_lines: List[str] = []
     with open(args.input_file_path) as fp:
         for line in fp.readlines():

tools/setup/emoji/generate_emoji_names_table

@@ -132,7 +132,7 @@ def generate_emoji_code_to_emoji_names_maps() -> None:
         if emoji_code in reverse_unified_reactions_map:
             reverse_unified_reactions_map[emoji_code].append(name)
         else:
-            reverse_unified_reactions_map[emoji_code] = [name, ]
+            reverse_unified_reactions_map[emoji_code] = [name]
 
     for emoji_code in reverse_unified_reactions_map:
         emoji_code_to_gemoji_names[emoji_code] = ", ".join(reverse_unified_reactions_map[emoji_code])
@@ -146,7 +146,7 @@ def generate_emoji_code_to_emoji_names_maps() -> None:
     for emoji_code in EMOJI_NAME_MAPS:
         canonical_name = EMOJI_NAME_MAPS[emoji_code]["canonical_name"]
         aliases = EMOJI_NAME_MAPS[emoji_code]["aliases"]
-        names = [canonical_name, ]
+        names = [canonical_name]
         names.extend(aliases)
         emoji_code_to_zulip_names[emoji_code] = ", ".join(names)
 

tools/setup/emoji/import_emoji_names_from_csv

@@ -57,7 +57,7 @@ def check_valid_emoji_name(emoji_name: str) -> None:
 def check_emoji_names(canonical_name: str, aliases: List[str]) -> None:
     if canonical_name == 'X':
         return
-    names_to_check = [canonical_name, ] + aliases
+    names_to_check = [canonical_name] + aliases
     for name in names_to_check:
         check_valid_emoji_name(name)
         check_uniqueness(name)