In Windows, what Causes the “python3: command not found” Error?

What Causes the “python3: command not found” Error?

First, what exactly causes this error?

On Linux and macOS, the default Python runtime is usually version 2.x. So, the python command runs Python 2 while python3 explicitly runs Python 3. However, recent distributions are slowly discarding python2 in favor of python3 while retaining the python3 command.

But, there is no “python3” command on Windows. The Python executable is called python regardless of 2.x or 3.x.

So when installing a Python 3 package on Windows, referencing python3 causes the “command not found” error.

Let’s walk through a real example to solidify this:

$ git clone https://github.c

RuntimeError: Failed to infer device type, please set the environment variable `VLLM_LOGGING_LEVEL=DEBUG` to turn on verbose logging to help debug the issue. 2025-07-25 13:35:45 INFO 07-24 22:35:45 [__init__.py:248] No platform detected, vLLM is running on UnspecifiedPlatform 2025-07-25 13:35:45 WARNING 07-24 22:35:45 [_custom_ops.py:20] Failed to import from vllm._C with ImportError(&#39;\x01: cannot open shared object file: No such file or directory&#39;) 2025-07-25 13:37:16 INFO 07-24 22:37:16 [__init__.py:248] No platform detected, vLLM is running on UnspecifiedPlatform 2025-07-25 13:37:16 WARNING 07-24 22:37:16 [_custom_ops.py:20] Failed to import from vllm._C with ImportError(&#39;\x01: cannot open shared object file: No such file or directory&#39;) 2025-07-25 13:37:19 Traceback (most recent call last): 2025-07-25 13:37:19 File "<frozen runpy>", line 198, in _run_module_as_main 2025-07-25 13:37:19 File "<frozen runpy>", line 88, in _run_code 2025-07-25 13:37:19 File "/usr/local/lib/python3.12/dist-packages/vllm/entrypoints/openai/api_server.py", line 1491, in <module> 2025-07-25 13:37:19 parser = make_arg_parser(parser) 2025-07-25 13:37:19 ^^^^^^^^^^^^^^^^^^^^^^^ 2025-07-25 13:37:19 File "/usr/local/lib/python3.12/dist-packages/vllm/entrypoints/openai/cli_args.py", line 266, in make_arg_parser 2025-07-25 13:37:19 parser = AsyncEngineArgs.add_cli_args(parser) 2025-07-25 13:37:19 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ 2025-07-25 13:37:19 File "/usr/local/lib/python3.12/dist-packages/vllm/engine/arg_utils.py", line 1717, in add_cli_args 2025-07-25 13:37:19 parser = EngineArgs.add_cli_args(parser) 2025-07-25 13:37:19 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ 2025-07-25 13:37:19 File "/usr/local/lib/python3.12/dist-packages/vllm/engine/arg_utils.py", line 906, in add_cli_args 2025-07-25 13:37:19 vllm_kwargs = get_kwargs(VllmConfig) 2025-07-25 13:37:19 ^^^^^^^^^^^^^^^^^^^^^^ 2025-07-25 13:37:19 File "/usr/local/lib/python3.12/dist-packages/vllm/engine/arg_utils.py", line 285, in get_kwargs 2025-07-25 13:37:19 return copy.deepcopy(_compute_kwargs(cls)) 2025-07-25 13:37:19 ^^^^^^^^^^^^^^^^^^^^ 2025-07-25 13:37:19 File "/usr/local/lib/python3.12/dist-packages/vllm/engine/arg_utils.py", line 189, in _compute_kwargs 2025-07-25 13:37:19 default = field.default_factory() 2025-07-25 13:37:19 ^^^^^^^^^^^^^^^^^^^^^^^ 2025-07-25 13:37:19 File "/usr/local/lib/python3.12/dist-packages/pydantic/_internal/_dataclasses.py", line 123, in __init__ 2025-07-25 13:37:19 s.__pydantic_validator__.validate_python(ArgsKwargs(args, kwargs), self_instance=s) 2025-07-25 13:37:19 File "/usr/local/lib/python3.12/dist-packages/vllm/config.py", line 2413, in __post_init__ 2025-07-25 13:37:19 raise RuntimeError( 2025-07-25 13:37:19 RuntimeError: Failed to infer device type, please set the environment variable `VLLM_LOGGING_LEVEL=DEBUG` to turn on verbose logging to help debug the issue.
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