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When installing certain libraries using pip in Python 3.15.0a2, pip reports an error #141877

Closed as not planned
Closed as not planned
When installing certain libraries using pip in Python 3.15.0a2, pip reports an error#141877
Labels
type-bugAn unexpected behavior, bug, or error

Description

@HIbingai
HIbingai
opened on Nov 23, 2025

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

  1. HIbingai
    added
    type-bugAn unexpected behavior, bug, or error
    on Nov 23, 2025

  2. hugovk commented on Nov 23, 2025

    @hugovk
    hugovk
    on Nov 23, 2025
    Member

    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.

  3. hugovk
    closed this as not plannedon Nov 23, 2025
  4. hugovk
    changed the title [-]When installing certain libraries using pip in Python 3.15o2, pip reports an error.[/-] [+]When installing certain libraries using pip in Python 3.15.0a2, pip reports an error[/+] on Nov 23, 2025

  5. terryjreedy commented on Nov 23, 2025

    @terryjreedy
    terryjreedy
    on Nov 23, 2025
    Member

    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!".

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