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Remove --force-uppercase-builtins flag #20410

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Merged
hauntsaninja merged 1 commit into from
Dec 14, 2025
Merged

Remove --force-uppercase-builtins flag #20410

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6 changes: 6 additions & 0 deletions CHANGELOG.md
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Expand Up @@ -11,6 +11,12 @@ Support for this will be dropped in the first half of 2026!

Contributed by Marc Mueller (PR [20156](https://github.com/python/mypy/pull/20156)).

### Removed Flag: `--force-uppercase-builtins`

Removed the deprecated `--force-uppercase-builtins` flag. It has been a no-op since mypy 1.17.0.

Contributed by Marc Mueller (PR [20410](https://github.com/python/mypy/pull/20410))

### Removed Flag: `--force-union-syntax`

Mypy only supports Python 3.10+. Removed the `--force-union-syntax` flag as it's no longer necessary.
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8 changes: 0 additions & 8 deletions mypy/main.py
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Expand Up @@ -815,11 +815,6 @@ def add_invertible_flag(
help="Disable strict Optional checks (inverse: --strict-optional)",
)

# This flag is deprecated, Mypy only supports Python 3.9+
add_invertible_flag(
"--force-uppercase-builtins", default=False, help=argparse.SUPPRESS, group=none_group
)

lint_group = parser.add_argument_group(
title="Configuring warnings",
description="Detect code that is sound but redundant or problematic.",
Expand Down Expand Up @@ -1537,9 +1532,6 @@ def set_strict_flags() -> None:
if options.strict_concatenate and not strict_option_set:
print("Warning: --strict-concatenate is deprecated; use --extra-checks instead")

if options.force_uppercase_builtins:
print("Warning: --force-uppercase-builtins is deprecated; mypy only supports Python 3.9+")

# Set target.
if special_opts.modules + special_opts.packages:
options.build_type = BuildType.MODULE
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11 changes: 0 additions & 11 deletions mypy/options.py
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Expand Up @@ -4,7 +4,6 @@
import re
import sys
import sysconfig
import warnings
from collections.abc import Callable
from re import Pattern
from typing import Any, Final
Expand Down Expand Up @@ -410,8 +409,6 @@ def __init__(self) -> None:

self.disable_bytearray_promotion = False
self.disable_memoryview_promotion = False
# Deprecated, Mypy only supports Python 3.9+
self.force_uppercase_builtins = False

# Sets custom output format
self.output: str | None = None
Expand All @@ -422,14 +419,6 @@ def __init__(self) -> None:
# preserving manual tweaks to generated C file)
self.mypyc_skip_c_generation = False

def use_lowercase_names(self) -> bool:
warnings.warn(
"options.use_lowercase_names() is deprecated and will be removed in a future version",
DeprecationWarning,
stacklevel=2,
)
return True

def use_star_unpack(self) -> bool:
return self.python_version >= (3, 11)

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