Enable ruff RUF ruleset for Ruff-specific rules

Mostly this involved replacing mutable class variables with immutable class variables - i.e. class-level member lists were replaced with tuples.

Author: tleonhardt

cmd2/__init__.py

@@ -52,7 +52,7 @@
 from .py_bridge import CommandResult
 from .utils import CompletionMode, CustomCompletionSettings, Settable, categorize
 
-__all__: list[str] = [
+__all__: list[str] = [  # noqa: RUF022
     'COMMAND_NAME',
     'DEFAULT_SHORTCUTS',
     # ANSI Exports

cmd2/cmd2.py

@@ -281,7 +281,7 @@ def remove(self, command_method: CommandFunc) -> None:
 class Cmd(cmd.Cmd):
     """An easy but powerful framework for writing line-oriented command interpreters.
 
-    Extends the Python Standard Library’s cmd package by adding a lot of useful features
+    Extends the Python Standard Library's cmd package by adding a lot of useful features
     to the out of the box configuration.
 
     Line-oriented command interpreters are often useful for test harnesses, internal tools, and rapid prototypes.

cmd2/utils.py

@@ -531,7 +531,7 @@ class ByteBuf:
     """Used by StdSim to write binary data and stores the actual bytes written."""
 
     # Used to know when to flush the StdSim
-    NEWLINES = [b'\n', b'\r']
+    NEWLINES = (b'\n', b'\r')
 
     def __init__(self, std_sim_instance: StdSim) -> None:
         self.byte_buf = bytearray()

examples/cmd_as_argument.py

@@ -21,9 +21,9 @@ class CmdLineApp(cmd2.Cmd):
 
     # Setting this true makes it run a shell command if a cmd2/cmd command doesn't exist
     # default_to_shell = True  # noqa: ERA001
-    MUMBLES = ['like', '...', 'um', 'er', 'hmmm', 'ahh']
-    MUMBLE_FIRST = ['so', 'like', 'well']
-    MUMBLE_LAST = ['right?']
+    MUMBLES = ('like', '...', 'um', 'er', 'hmmm', 'ahh')
+    MUMBLE_FIRST = ('so', 'like', 'well')
+    MUMBLE_LAST = ('right?',)
 
     def __init__(self) -> None:
         shortcuts = dict(cmd2.DEFAULT_SHORTCUTS)

examples/example.py

@@ -19,9 +19,9 @@ class CmdLineApp(cmd2.Cmd):
 
     # Setting this true makes it run a shell command if a cmd2/cmd command doesn't exist
     # default_to_shell = True  # noqa: ERA001
-    MUMBLES = ['like', '...', 'um', 'er', 'hmmm', 'ahh']
-    MUMBLE_FIRST = ['so', 'like', 'well']
-    MUMBLE_LAST = ['right?']
+    MUMBLES = ('like', '...', 'um', 'er', 'hmmm', 'ahh')
+    MUMBLE_FIRST = ('so', 'like', 'well')
+    MUMBLE_LAST = ('right?',)
 
     def __init__(self) -> None:
         shortcuts = cmd2.DEFAULT_SHORTCUTS

examples/help_categories.py

@@ -25,7 +25,7 @@ def wrapper(*args, **kwds):
 class HelpCategories(cmd2.Cmd):
     """Example cmd2 application."""
 
-    START_TIMES = ['now', 'later', 'sometime', 'whenever']
+    START_TIMES = ('now', 'later', 'sometime', 'whenever')
 
     # Command categories
     CMD_CAT_CONNECTING = 'Connecting'

examples/migrating.py

@@ -9,9 +9,9 @@
 class CmdLineApp(cmd.Cmd):
     """Example cmd application."""
 
-    MUMBLES = ['like', '...', 'um', 'er', 'hmmm', 'ahh']
-    MUMBLE_FIRST = ['so', 'like', 'well']
-    MUMBLE_LAST = ['right?']
+    MUMBLES = ('like', '...', 'um', 'er', 'hmmm', 'ahh')
+    MUMBLE_FIRST = ('so', 'like', 'well')
+    MUMBLE_LAST = ('right?',)
 
     def do_exit(self, line) -> bool:
         """Exit the application."""

examples/modular_commands/commandset_basic.py

@@ -12,17 +12,17 @@
 @with_default_category('Basic Completion')
 class BasicCompletionCommandSet(CommandSet):
     # List of strings used with completion functions
-    food_item_strs = ['Pizza', 'Ham', 'Ham Sandwich', 'Potato']
-    sport_item_strs = ['Bat', 'Basket', 'Basketball', 'Football', 'Space Ball']
+    food_item_strs = ('Pizza', 'Ham', 'Ham Sandwich', 'Potato')
+    sport_item_strs = ('Bat', 'Basket', 'Basketball', 'Football', 'Space Ball')
 
     # This data is used to demonstrate delimiter_complete
-    file_strs = [
+    file_strs = (
         '/home/user/file.db',
         '/home/user/file space.db',
         '/home/user/another.db',
         '/home/other user/maps.db',
         '/home/other user/tests.db',
-    ]
+    )
 
     def do_flag_based(self, statement: Statement) -> None:
         """Tab completes arguments based on a preceding flag using flag_based_complete

pyproject.toml

@@ -205,7 +205,7 @@ select = [
     "Q",   # flake8-quotes (force double quotes)
     "RET", # flake8-return (various warnings related to implicit vs explicit return statements)
     "RSE", # flake8-raise (warn about unnecessary parentheses on raised exceptions)
-    # "RUF", # Ruff-specific rules (miscellaneous grab bag of lint checks specific to Ruff)
+    "RUF", # Ruff-specific rules (miscellaneous grab bag of lint checks specific to Ruff)
     "S",   # flake8-bandit (security oriented checks, but extremely pedantic - do not attempt to apply to unit test files)
     "SIM", # flake8-simplify (rules to attempt to simplify code)
     # "SLF",  # flake8-self (warn when protected members are accessed outside of a class or file)

tests/test_argparse_completer.py

@@ -107,17 +107,17 @@ def do_pos_and_flag(self, args: argparse.Namespace) -> None:
     TUPLE_METAVAR = ('arg1', 'others')
     CUSTOM_DESC_HEADER = "Custom Header"
 
-    # lists used in our tests (there is a mix of sorted and unsorted on purpose)
-    non_negative_num_choices = [1, 2, 3, 0.5, 22]
-    num_choices = [-1, 1, -2, 2.5, 0, -12]
-    static_choices_list = ['static', 'choices', 'stop', 'here']
-    choices_from_provider = ['choices', 'provider', 'probably', 'improved']
-    completion_item_choices = [CompletionItem('choice_1', 'A description'), CompletionItem('choice_2', 'Another description')]
+    # tuples (for sake of immutability) used in our tests (there is a mix of sorted and unsorted on purpose)
+    non_negative_num_choices = (1, 2, 3, 0.5, 22)
+    num_choices = (-1, 1, -2, 2.5, 0, -12)
+    static_choices_list = ('static', 'choices', 'stop', 'here')
+    choices_from_provider = ('choices', 'provider', 'probably', 'improved')
+    completion_item_choices = (CompletionItem('choice_1', 'A description'), CompletionItem('choice_2', 'Another description'))
 
     # This tests that CompletionItems created with numerical values are sorted as numbers.
-    num_completion_items = [CompletionItem(5, "Five"), CompletionItem(1.5, "One.Five"), CompletionItem(2, "Five")]
+    num_completion_items = (CompletionItem(5, "Five"), CompletionItem(1.5, "One.Five"), CompletionItem(2, "Five"))
 
-    def choices_provider(self) -> list[str]:
+    def choices_provider(self) -> tuple[str]:
         """Method that provides choices"""
         return self.choices_from_provider
 
@@ -179,9 +179,9 @@ def do_choices(self, args: argparse.Namespace) -> None:
     ############################################################################################################
     # Begin code related to testing completer parameter
     ############################################################################################################
-    completions_for_flag = ['completions', 'flag', 'fairly', 'complete']
-    completions_for_pos_1 = ['completions', 'positional_1', 'probably', 'missed', 'spot']
-    completions_for_pos_2 = ['completions', 'positional_2', 'probably', 'missed', 'me']
+    completions_for_flag = ('completions', 'flag', 'fairly', 'complete')
+    completions_for_pos_1 = ('completions', 'positional_1', 'probably', 'missed', 'spot')
+    completions_for_pos_2 = ('completions', 'positional_2', 'probably', 'missed', 'me')
 
     def flag_completer(self, text: str, line: str, begidx: int, endidx: int) -> list[str]:
         return self.basic_complete(text, line, begidx, endidx, self.completions_for_flag)
@@ -208,12 +208,12 @@ def do_completer(self, args: argparse.Namespace) -> None:
     ############################################################################################################
     # Begin code related to nargs
     ############################################################################################################
-    set_value_choices = ['set', 'value', 'choices']
-    one_or_more_choices = ['one', 'or', 'more', 'choices']
-    optional_choices = ['a', 'few', 'optional', 'choices']
-    range_choices = ['some', 'range', 'choices']
-    remainder_choices = ['remainder', 'choices']
-    positional_choices = ['the', 'positional', 'choices']
+    set_value_choices = ('set', 'value', 'choices')
+    one_or_more_choices = ('one', 'or', 'more', 'choices')
+    optional_choices = ('a', 'few', 'optional', 'choices')
+    range_choices = ('some', 'range', 'choices')
+    remainder_choices = ('remainder', 'choices')
+    positional_choices = ('the', 'positional', 'choices')
 
     nargs_parser = Cmd2ArgumentParser()
 
@@ -572,10 +572,9 @@ def test_autocomp_flag_choices_completion(ac_app, flag, text, completions) -> No
 
     # Numbers will be sorted in ascending order and then converted to strings by ArgparseCompleter
     if completions and all(isinstance(x, numbers.Number) for x in completions):
-        completions.sort()
-        completions = [str(x) for x in completions]
+        completions = [str(x) for x in sorted(completions)]
     else:
-        completions.sort(key=ac_app.default_sort_key)
+        completions = sorted(completions, key=ac_app.default_sort_key)
 
     assert ac_app.completion_matches == completions
 
@@ -606,10 +605,9 @@ def test_autocomp_positional_choices_completion(ac_app, pos, text, completions)
 
     # Numbers will be sorted in ascending order and then converted to strings by ArgparseCompleter
     if completions and all(isinstance(x, numbers.Number) for x in completions):
-        completions.sort()
-        completions = [str(x) for x in completions]
+        completions = [str(x) for x in sorted(completions)]
     else:
-        completions.sort(key=ac_app.default_sort_key)
+        completions = sorted(completions, key=ac_app.default_sort_key)
 
     assert ac_app.completion_matches == completions