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When installing certain libraries using pip in Python 3.15.0a2, pip reports an error #141877
Closed as not planned
Description
Bug report
Bug description:
When using “pip install ”, you may encounter the following error：
> Collecting numpy
Using cached https://pypi.tuna.tsinghua.edu.cn/packages/76/65/21b3bc86aac7b8f2862db1e808f1ea22b028e30a225a34a5ede9bf8678f2/numpy-2.3.5.tar.gz (20.6 MB)
Installing build dependencies ... done
Getting requirements to build wheel ... done
Installing backend dependencies ... done
Preparing metadata (pyproject.toml) ... error
error: subprocess-exited-with-error
× Preparing metadata (pyproject.toml) did not run successfully.
│ exit code: 2
╰─> [89 lines of output]
+ C:\Users\47268\AppData\Local\Programs\Python\Python315\python.exe C:\Users\47268\AppData\Local\Temp\pip-install-2f38qn8g\numpy_3ba56112f04847cc82d9e0eee045d153\vendored-meson\meson\meson.py setup C:\Users\47268\AppData\Local\Temp\pip-install-2f38qn8g\numpy_3ba56112f04847cc82d9e0eee045d153 C:\Users\47268\AppData\Local\Temp\pip-install-2f38qn8g\numpy_3ba56112f04847cc82d9e0eee045d153\.mesonpy-1q31a28p -Dbuildtype=release -Db_ndebug=if-release -Db_vscrt=md --native-file=C:\Users\47268\AppData\Local\Temp\pip-install-2f38qn8g\numpy_3ba56112f04847cc82d9e0eee045d153\.mesonpy-1q31a28p\meson-python-native-file.ini
Exception in thread Thread-4 (_readerthread):
Exception in thread Thread-3 (_readerthread):
Traceback (most recent call last):
File "C:\Users\47268\AppData\Local\Programs\Python\Python315\Lib\threading.py", line 1075, in _bootstrap_inner
self._context.run(self.run)
~~~~~~~~~~~~~~~~~^^^^^^^^^^
File "C:\Users\47268\AppData\Local\Programs\Python\Python315\Lib\threading.py", line 1017, in run
self._target(*self._args, **self._kwargs)
~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\47268\AppData\Local\Programs\Python\Python315\Lib\subprocess.py", line 1612, in _readerthread
buffer.append(fh.read())
~~~~~~~^^
File "<frozen codecs>", line 325, in decode
UnicodeDecodeError: 'utf-8' codec can't decode byte 0xb1 in position 19: invalid start byte
Traceback (most recent call last):
File "C:\Users\47268\AppData\Local\Programs\Python\Python315\Lib\threading.py", line 1075, in _bootstrap_inner
self._context.run(self.run)
~~~~~~~~~~~~~~~~~^^^^^^^^^^
File "C:\Users\47268\AppData\Local\Programs\Python\Python315\Lib\threading.py", line 1017, in run
self._target(*self._args, **self._kwargs)
~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\47268\AppData\Local\Programs\Python\Python315\Lib\subprocess.py", line 1612, in _readerthread
buffer.append(fh.read())
~~~~~~~^^
File "<frozen codecs>", line 325, in decode
UnicodeDecodeError: 'utf-8' codec can't decode byte 0xd3 in position 0: invalid continuation byte
Traceback (most recent call last):
File "C:\Users\47268\AppData\Local\Temp\pip-install-2f38qn8g\numpy_3ba56112f04847cc82d9e0eee045d153\vendored-meson\meson\mesonbuild\mesonmain.py", line 193, in run
return options.run_func(options)
~~~~~~~~~~~~~~~~^^^^^^^^^
File "C:\Users\47268\AppData\Local\Temp\pip-install-2f38qn8g\numpy_3ba56112f04847cc82d9e0eee045d153\vendored-meson\meson\mesonbuild\msetup.py", line 390, in run
app.generate()
~~~~~~~~~~~~^^
File "C:\Users\47268\AppData\Local\Temp\pip-install-2f38qn8g\numpy_3ba56112f04847cc82d9e0eee045d153\vendored-meson\meson\mesonbuild\msetup.py", line 192, in generate
return self._generate(env, capture, vslite_ctx)
~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\47268\AppData\Local\Temp\pip-install-2f38qn8g\numpy_3ba56112f04847cc82d9e0eee045d153\vendored-meson\meson\mesonbuild\msetup.py", line 232, in _generate
intr = interpreter.Interpreter(b, user_defined_options=user_defined_options)
File "C:\Users\47268\AppData\Local\Temp\pip-install-2f38qn8g\numpy_3ba56112f04847cc82d9e0eee045d153\vendored-meson\meson\mesonbuild\interpreter\interpreter.py", line 308, in __init__
self.parse_project()
~~~~~~~~~~~~~~~~~~^^
File "C:\Users\47268\AppData\Local\Temp\pip-install-2f38qn8g\numpy_3ba56112f04847cc82d9e0eee045d153\vendored-meson\meson\mesonbuild\interpreterbase\interpreterbase.py", line 138, in parse_project
self.evaluate_codeblock(self.ast, end=1)
~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^
File "C:\Users\47268\AppData\Local\Temp\pip-install-2f38qn8g\numpy_3ba56112f04847cc82d9e0eee045d153\vendored-meson\meson\mesonbuild\interpreterbase\interpreterbase.py", line 203, in evaluate_codeblock
raise e
File "C:\Users\47268\AppData\Local\Temp\pip-install-2f38qn8g\numpy_3ba56112f04847cc82d9e0eee045d153\vendored-meson\meson\mesonbuild\interpreterbase\interpreterbase.py", line 195, in evaluate_codeblock
self.evaluate_statement(cur)
~~~~~~~~~~~~~~~~~~~~~~~^^^^^
File "C:\Users\47268\AppData\Local\Temp\pip-install-2f38qn8g\numpy_3ba56112f04847cc82d9e0eee045d153\vendored-meson\meson\mesonbuild\interpreterbase\interpreterbase.py", line 209, in evaluate_statement
return self.function_call(cur)
~~~~~~~~~~~~~~~~~~^^^^^
File "C:\Users\47268\AppData\Local\Temp\pip-install-2f38qn8g\numpy_3ba56112f04847cc82d9e0eee045d153\vendored-meson\meson\mesonbuild\interpreterbase\interpreterbase.py", line 536, in function_call
res = func(node, func_args, kwargs)
File "C:\Users\47268\AppData\Local\Temp\pip-install-2f38qn8g\numpy_3ba56112f04847cc82d9e0eee045d153\vendored-meson\meson\mesonbuild\interpreterbase\decorators.py", line 237, in wrapper
return f(*nargs, **wrapped_kwargs)
File "C:\Users\47268\AppData\Local\Temp\pip-install-2f38qn8g\numpy_3ba56112f04847cc82d9e0eee045d153\vendored-meson\meson\mesonbuild\interpreterbase\decorators.py", line 556, in wrapper
return f(*wrapped_args, **wrapped_kwargs)
File "C:\Users\47268\AppData\Local\Temp\pip-install-2f38qn8g\numpy_3ba56112f04847cc82d9e0eee045d153\vendored-meson\meson\mesonbuild\interpreter\interpreter.py", line 1293, in func_project
self.add_languages(proj_langs, True, MachineChoice.HOST)
~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\47268\AppData\Local\Temp\pip-install-2f38qn8g\numpy_3ba56112f04847cc82d9e0eee045d153\vendored-meson\meson\mesonbuild\interpreter\interpreter.py", line 1477, in add_languages
success = self.add_languages_for(args, required, for_machine)
File "C:\Users\47268\AppData\Local\Temp\pip-install-2f38qn8g\numpy_3ba56112f04847cc82d9e0eee045d153\vendored-meson\meson\mesonbuild\interpreter\interpreter.py", line 1520, in add_languages_for
comp = compilers.detect_compiler_for(self.environment, lang, for_machine, skip_sanity_check, self.subproject)
File "C:\Users\47268\AppData\Local\Temp\pip-install-2f38qn8g\numpy_3ba56112f04847cc82d9e0eee045d153\vendored-meson\meson\mesonbuild\compilers\detect.py", line 106, in detect_compiler_for
comp = compiler_from_language(env, lang, for_machine)
File "C:\Users\47268\AppData\Local\Temp\pip-install-2f38qn8g\numpy_3ba56112f04847cc82d9e0eee045d153\vendored-meson\meson\mesonbuild\compilers\detect.py", line 103, in compiler_from_language
return lang_map[lang](env, for_machine) if lang in lang_map else None
~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^
File "C:\Users\47268\AppData\Local\Temp\pip-install-2f38qn8g\numpy_3ba56112f04847cc82d9e0eee045d153\vendored-meson\meson\mesonbuild\compilers\detect.py", line 633, in detect_c_compiler
return _detect_c_or_cpp_compiler(env, 'c', for_machine)
File "C:\Users\47268\AppData\Local\Temp\pip-install-2f38qn8g\numpy_3ba56112f04847cc82d9e0eee045d153\vendored-meson\meson\mesonbuild\compilers\detect.py", line 335, in _detect_c_or_cpp_compiler
full_version = out.split('\n', 1)[0]
^^^^^^^^^
AttributeError: 'NoneType' object has no attribute 'split'
The Meson build system
Version: 1.8.3
Source dir: C:\Users\47268\AppData\Local\Temp\pip-install-2f38qn8g\numpy_3ba56112f04847cc82d9e0eee045d153
Build dir: C:\Users\47268\AppData\Local\Temp\pip-install-2f38qn8g\numpy_3ba56112f04847cc82d9e0eee045d153\.mesonpy-1q31a28p
Build type: native build
Activating VS 17.14.21 (November 2025)
Project name: NumPy
Project version: 2.3.5
..\meson.build:1:0: ERROR: Unhandled python exception
This is a Meson bug and should be reported!
[end of output]
note: This error originates from a subprocess, and is likely not a problem with pip.
error: metadata-generation-failed
× Encountered error while generating package metadata.
╰─> numpy
note: This is an issue with the package mentioned above, not pip.
hint: See above for details.
D:\Users\47268\Downloads\Compressed\Tiemu-main>pip install numpy --only-binary=all --force-reinstall
Looking in indexes: https://pypi.tuna.tsinghua.edu.cn/simple
Collecting numpy
Using cached https://pypi.tuna.tsinghua.edu.cn/packages/76/65/21b3bc86aac7b8f2862db1e808f1ea22b028e30a225a34a5ede9bf8678f2/numpy-2.3.5.tar.gz (20.6 MB)
Installing build dependencies ... done
Getting requirements to build wheel ... done
Installing backend dependencies ... done
Preparing metadata (pyproject.toml) ... error
error: subprocess-exited-with-error
× Preparing metadata (pyproject.toml) did not run successfully.
│ exit code: 2
╰─> [89 lines of output]
+ C:\Users\47268\AppData\Local\Programs\Python\Python315\python.exe C:\Users\47268\AppData\Local\Temp\pip-install-7kz9ss7e\numpy_dce3a841859043398712e498227031b4\vendored-meson\meson\meson.py setup C:\Users\47268\AppData\Local\Temp\pip-install-7kz9ss7e\numpy_dce3a841859043398712e498227031b4 C:\Users\47268\AppData\Local\Temp\pip-install-7kz9ss7e\numpy_dce3a841859043398712e498227031b4\.mesonpy-knf3eg74 -Dbuildtype=release -Db_ndebug=if-release -Db_vscrt=md --native-file=C:\Users\47268\AppData\Local\Temp\pip-install-7kz9ss7e\numpy_dce3a841859043398712e498227031b4\.mesonpy-knf3eg74\meson-python-native-file.ini
Exception in thread Thread-4 (_readerthread):
Exception in thread Thread-3 (_readerthread):
Traceback (most recent call last):
File "C:\Users\47268\AppData\Local\Programs\Python\Python315\Lib\threading.py", line 1075, in _bootstrap_inner
self._context.run(self.run)
~~~~~~~~~~~~~~~~~^^^^^^^^^^
File "C:\Users\47268\AppData\Local\Programs\Python\Python315\Lib\threading.py", line 1017, in run
self._target(*self._args, **self._kwargs)
~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\47268\AppData\Local\Programs\Python\Python315\Lib\subprocess.py", line 1612, in _readerthread
buffer.append(fh.read())
~~~~~~~^^
File "<frozen codecs>", line 325, in decode
UnicodeDecodeError: 'utf-8' codec can't decode byte 0xb1 in position 19: invalid start byte
Traceback (most recent call last):
File "C:\Users\47268\AppData\Local\Programs\Python\Python315\Lib\threading.py", line 1075, in _bootstrap_inner
self._context.run(self.run)
~~~~~~~~~~~~~~~~~^^^^^^^^^^
File "C:\Users\47268\AppData\Local\Programs\Python\Python315\Lib\threading.py", line 1017, in run
self._target(*self._args, **self._kwargs)
~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\47268\AppData\Local\Programs\Python\Python315\Lib\subprocess.py", line 1612, in _readerthread
buffer.append(fh.read())
~~~~~~~^^
File "<frozen codecs>", line 325, in decode
UnicodeDecodeError: 'utf-8' codec can't decode byte 0xd3 in position 0: invalid continuation byte
Traceback (most recent call last):
File "C:\Users\47268\AppData\Local\Temp\pip-install-7kz9ss7e\numpy_dce3a841859043398712e498227031b4\vendored-meson\meson\mesonbuild\mesonmain.py", line 193, in run
return options.run_func(options)
~~~~~~~~~~~~~~~~^^^^^^^^^
File "C:\Users\47268\AppData\Local\Temp\pip-install-7kz9ss7e\numpy_dce3a841859043398712e498227031b4\vendored-meson\meson\mesonbuild\msetup.py", line 390, in run
app.generate()
~~~~~~~~~~~~^^
File "C:\Users\47268\AppData\Local\Temp\pip-install-7kz9ss7e\numpy_dce3a841859043398712e498227031b4\vendored-meson\meson\mesonbuild\msetup.py", line 192, in generate
return self._generate(env, capture, vslite_ctx)
~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\47268\AppData\Local\Temp\pip-install-7kz9ss7e\numpy_dce3a841859043398712e498227031b4\vendored-meson\meson\mesonbuild\msetup.py", line 232, in _generate
intr = interpreter.Interpreter(b, user_defined_options=user_defined_options)
File "C:\Users\47268\AppData\Local\Temp\pip-install-7kz9ss7e\numpy_dce3a841859043398712e498227031b4\vendored-meson\meson\mesonbuild\interpreter\interpreter.py", line 308, in __init__
self.parse_project()
~~~~~~~~~~~~~~~~~~^^
File "C:\Users\47268\AppData\Local\Temp\pip-install-7kz9ss7e\numpy_dce3a841859043398712e498227031b4\vendored-meson\meson\mesonbuild\interpreterbase\interpreterbase.py", line 138, in parse_project
self.evaluate_codeblock(self.ast, end=1)
~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^
File "C:\Users\47268\AppData\Local\Temp\pip-install-7kz9ss7e\numpy_dce3a841859043398712e498227031b4\vendored-meson\meson\mesonbuild\interpreterbase\interpreterbase.py", line 203, in evaluate_codeblock
raise e
File "C:\Users\47268\AppData\Local\Temp\pip-install-7kz9ss7e\numpy_dce3a841859043398712e498227031b4\vendored-meson\meson\mesonbuild\interpreterbase\interpreterbase.py", line 195, in evaluate_codeblock
self.evaluate_statement(cur)
~~~~~~~~~~~~~~~~~~~~~~~^^^^^
File "C:\Users\47268\AppData\Local\Temp\pip-install-7kz9ss7e\numpy_dce3a841859043398712e498227031b4\vendored-meson\meson\mesonbuild\interpreterbase\interpreterbase.py", line 209, in evaluate_statement
return self.function_call(cur)
~~~~~~~~~~~~~~~~~~^^^^^
File "C:\Users\47268\AppData\Local\Temp\pip-install-7kz9ss7e\numpy_dce3a841859043398712e498227031b4\vendored-meson\meson\mesonbuild\interpreterbase\interpreterbase.py", line 536, in function_call
res = func(node, func_args, kwargs)
File "C:\Users\47268\AppData\Local\Temp\pip-install-7kz9ss7e\numpy_dce3a841859043398712e498227031b4\vendored-meson\meson\mesonbuild\interpreterbase\decorators.py", line 237, in wrapper
return f(*nargs, **wrapped_kwargs)
File "C:\Users\47268\AppData\Local\Temp\pip-install-7kz9ss7e\numpy_dce3a841859043398712e498227031b4\vendored-meson\meson\mesonbuild\interpreterbase\decorators.py", line 556, in wrapper
return f(*wrapped_args, **wrapped_kwargs)
File "C:\Users\47268\AppData\Local\Temp\pip-install-7kz9ss7e\numpy_dce3a841859043398712e498227031b4\vendored-meson\meson\mesonbuild\interpreter\interpreter.py", line 1293, in func_project
self.add_languages(proj_langs, True, MachineChoice.HOST)
~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\47268\AppData\Local\Temp\pip-install-7kz9ss7e\numpy_dce3a841859043398712e498227031b4\vendored-meson\meson\mesonbuild\interpreter\interpreter.py", line 1477, in add_languages
success = self.add_languages_for(args, required, for_machine)
File "C:\Users\47268\AppData\Local\Temp\pip-install-7kz9ss7e\numpy_dce3a841859043398712e498227031b4\vendored-meson\meson\mesonbuild\interpreter\interpreter.py", line 1520, in add_languages_for
comp = compilers.detect_compiler_for(self.environment, lang, for_machine, skip_sanity_check, self.subproject)
File "C:\Users\47268\AppData\Local\Temp\pip-install-7kz9ss7e\numpy_dce3a841859043398712e498227031b4\vendored-meson\meson\mesonbuild\compilers\detect.py", line 106, in detect_compiler_for
comp = compiler_from_language(env, lang, for_machine)
File "C:\Users\47268\AppData\Local\Temp\pip-install-7kz9ss7e\numpy_dce3a841859043398712e498227031b4\vendored-meson\meson\mesonbuild\compilers\detect.py", line 103, in compiler_from_language
return lang_map[lang](env, for_machine) if lang in lang_map else None
~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^
File "C:\Users\47268\AppData\Local\Temp\pip-install-7kz9ss7e\numpy_dce3a841859043398712e498227031b4\vendored-meson\meson\mesonbuild\compilers\detect.py", line 633, in detect_c_compiler
return _detect_c_or_cpp_compiler(env, 'c', for_machine)
File "C:\Users\47268\AppData\Local\Temp\pip-install-7kz9ss7e\numpy_dce3a841859043398712e498227031b4\vendored-meson\meson\mesonbuild\compilers\detect.py", line 335, in _detect_c_or_cpp_compiler
full_version = out.split('\n', 1)[0]
^^^^^^^^^
AttributeError: 'NoneType' object has no attribute 'split'
The Meson build system
Version: 1.8.3
Source dir: C:\Users\47268\AppData\Local\Temp\pip-install-7kz9ss7e\numpy_dce3a841859043398712e498227031b4
Build dir: C:\Users\47268\AppData\Local\Temp\pip-install-7kz9ss7e\numpy_dce3a841859043398712e498227031b4\.mesonpy-knf3eg74
Build type: native build
Activating VS 17.14.21 (November 2025)
Project name: NumPy
Project version: 2.3.5
..\meson.build:1:0: ERROR: Unhandled python exception
This is a Meson bug and should be reported!
[end of output]
note: This error originates from a subprocess, and is likely not a problem with pip.
error: metadata-generation-failed
× Encountered error while generating package metadata.
╰─> numpy
note: This is an issue with the package mentioned above, not pip.
hint: See above for details.CPython versions tested on:
3.15
Operating systems tested on:
Windows
Activity
hugovk commented on Nov 23, 2025
This is because NumPy doesn't yet have prebuilt binary wheels for Python 3.15: see https://pypi.org/project/numpy/#files (and I expect the same for the https://mirrors.tuna.tsinghua.edu.cn mirror). It's too early for them to provide them, I think they typically wait until around beta in May. So pip is trying to build from source, but you don't have all the dependencies set up.
I recommend using 3.14 with NumPy, or checking NumPy docs for how to build from source on Windows.
terryjreedy commented on Nov 23, 2025
Perhaps our download pages, especially for previews, should mention what error is displayed when a package is not available. Even better would be if pip/meson said something better than requesting a bogus report: "This is a Meson bug and should be reported!".