Unfortunately on a clean install of Python 3.9 and Streamlit 1.2, it didn’t happen for me. Are you using conda or a different way of installing Python?
The biggest question is where numexpr package comes from. It’s not a Streamlit requirement.
PS C:\Users\randy> pip install streamlit==1.2
Collecting streamlit==1.2
  Downloading streamlit-1.2.0-py2.py3-none-any.whl (9.1 MB)
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  Downloading toml-0.10.2-py2.py3-none-any.whl (16 kB)
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  Downloading GitPython-3.1.24-py3-none-any.whl (180 kB)
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  Downloading tornado-6.1-cp39-cp39-win_amd64.whl (422 kB)
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  Downloading click-7.1.2-py2.py3-none-any.whl (82 kB)
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Collecting blinker
  Downloading blinker-1.4.tar.gz (111 kB)
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  Downloading pyarrow-6.0.1-cp39-cp39-win_amd64.whl (15.5 MB)
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  Downloading altair-4.1.0-py3-none-any.whl (727 kB)
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  Downloading numpy-1.21.4-cp39-cp39-win_amd64.whl (14.0 MB)
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Collecting validators
  Downloading validators-0.18.2-py3-none-any.whl (19 kB)
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  Downloading protobuf-3.19.1-cp39-cp39-win_amd64.whl (895 kB)
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Collecting packaging
  Downloading packaging-21.3-py3-none-any.whl (40 kB)
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Collecting base58
  Downloading base58-2.1.1-py3-none-any.whl (5.6 kB)
Collecting tzlocal
  Downloading tzlocal-4.1-py3-none-any.whl (19 kB)
Collecting pandas>=0.21.0
  Downloading pandas-1.3.4-cp39-cp39-win_amd64.whl (10.2 MB)
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Collecting cachetools>=4.0
  Downloading cachetools-4.2.4-py3-none-any.whl (10 kB)
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  Downloading toolz-0.11.2-py3-none-any.whl (55 kB)
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  Downloading jsonschema-4.2.1-py3-none-any.whl (69 kB)
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  Downloading Jinja2-3.0.3-py3-none-any.whl (133 kB)
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  Downloading entrypoints-0.3-py2.py3-none-any.whl (11 kB)
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     |████████████████████████████████| 63 kB ...
Collecting typing-extensions>=3.7.4.3
  Downloading typing_extensions-4.0.1-py3-none-any.whl (22 kB)
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  Downloading pytz-2021.3-py2.py3-none-any.whl (503 kB)
     |████████████████████████████████| 503 kB ...
Collecting traitlets>=4.3.2
  Downloading traitlets-5.1.1-py3-none-any.whl (102 kB)
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  Downloading ipywidgets-7.6.5-py2.py3-none-any.whl (121 kB)
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  Downloading ipykernel-6.6.0-py3-none-any.whl (126 kB)
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Collecting debugpy<2.0,>=1.0.0
  Downloading debugpy-1.5.1-cp39-cp39-win_amd64.whl (4.4 MB)
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Collecting matplotlib-inline<0.2.0,>=0.1.0
  Downloading matplotlib_inline-0.1.3-py3-none-any.whl (8.2 kB)
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  Downloading jupyter_client-7.1.0-py3-none-any.whl (129 kB)
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Collecting ipython>=7.23.1
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  Downloading pickleshare-0.7.5-py2.py3-none-any.whl (6.9 kB)
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  Downloading backcall-0.2.0-py2.py3-none-any.whl (11 kB)
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  Downloading decorator-5.1.0-py3-none-any.whl (9.1 kB)
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  Downloading Pygments-2.10.0-py3-none-any.whl (1.0 MB)
     |████████████████████████████████| 1.0 MB ...
Collecting prompt-toolkit!=3.0.0,!=3.0.1,<3.1.0,>=2.0.0
  Downloading prompt_toolkit-3.0.24-py3-none-any.whl (374 kB)
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Collecting colorama
  Downloading colorama-0.4.4-py2.py3-none-any.whl (16 kB)
Requirement already satisfied: setuptools>=18.5 in c:\program files\windowsapps\pythonsoftwarefoundation.python.3.9_3.9.2544.0_x64__qbz5n2kfra8p0\lib\site-packages (from ipython>=7.23.1->ipykernel>=5.1.2->pydeck>=0.1.dev5->streamlit==1.2) (58.1.0)
Collecting nbformat>=4.2.0
  Downloading nbformat-5.1.3-py3-none-any.whl (178 kB)
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Collecting widgetsnbextension~=3.5.0
  Downloading widgetsnbextension-3.5.2-py2.py3-none-any.whl (1.6 MB)
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Collecting ipython-genutils~=0.2.0
  Downloading ipython_genutils-0.2.0-py2.py3-none-any.whl (26 kB)
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  Downloading jupyterlab_widgets-1.0.2-py3-none-any.whl (243 kB)
     |████████████████████████████████| 243 kB ...
Collecting parso<0.9.0,>=0.8.0
  Downloading parso-0.8.3-py2.py3-none-any.whl (100 kB)
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Collecting MarkupSafe>=2.0
  Downloading MarkupSafe-2.0.1-cp39-cp39-win_amd64.whl (14 kB)
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  Downloading pyzmq-22.3.0-cp39-cp39-win_amd64.whl (1.0 MB)
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Collecting nest-asyncio>=1.5
  Downloading nest_asyncio-1.5.4-py3-none-any.whl (5.1 kB)
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Collecting pyrsistent!=0.17.0,!=0.17.1,!=0.17.2,>=0.14.0
  Downloading pyrsistent-0.18.0-cp39-cp39-win_amd64.whl (62 kB)
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Collecting wcwidth
  Downloading wcwidth-0.2.5-py2.py3-none-any.whl (30 kB)
Collecting six>=1.5
  Downloading six-1.16.0-py2.py3-none-any.whl (11 kB)
Collecting notebook>=4.4.1
  Downloading notebook-6.4.6-py3-none-any.whl (9.9 MB)
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Collecting prometheus-client
  Downloading prometheus_client-0.12.0-py2.py3-none-any.whl (57 kB)
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Collecting Send2Trash>=1.8.0
  Downloading Send2Trash-1.8.0-py3-none-any.whl (18 kB)
Collecting argon2-cffi
  Downloading argon2_cffi-21.2.0-py3-none-any.whl (14 kB)
Collecting terminado>=0.8.3
  Downloading terminado-0.12.1-py3-none-any.whl (15 kB)
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Collecting pywinpty>=1.1.0
  Downloading pywinpty-1.1.6-cp39-none-win_amd64.whl (1.4 MB)
     |████████████████████████████████| 1.4 MB 6.4 MB/s
Collecting argon2-cffi-bindings
  Downloading argon2_cffi_bindings-21.2.0-cp36-abi3-win_amd64.whl (30 kB)
Collecting cffi>=1.0.1
  Downloading cffi-1.15.0-cp39-cp39-win_amd64.whl (180 kB)
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Collecting pycparser
  Downloading pycparser-2.21-py2.py3-none-any.whl (118 kB)
     |████████████████████████████████| 118 kB ...
Collecting jupyterlab-pygments
  Downloading jupyterlab_pygments-0.1.2-py2.py3-none-any.whl (4.6 kB)
Collecting bleach
  Downloading bleach-4.1.0-py2.py3-none-any.whl (157 kB)
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Collecting testpath
  Downloading testpath-0.5.0-py3-none-any.whl (84 kB)
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Collecting mistune<2,>=0.8.1
  Downloading mistune-0.8.4-py2.py3-none-any.whl (16 kB)
Collecting nbclient<0.6.0,>=0.5.0
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Collecting pandocfilters>=1.4.1
  Downloading pandocfilters-1.5.0-py2.py3-none-any.whl (8.7 kB)
Collecting defusedxml
  Downloading defusedxml-0.7.1-py2.py3-none-any.whl (25 kB)
Collecting webencodings
  Downloading webencodings-0.5.1-py2.py3-none-any.whl (11 kB)
Collecting pyparsing!=3.0.5,>=2.0.2
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Collecting urllib3<1.27,>=1.21.1
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Collecting charset-normalizer~=2.0.0
  Downloading charset_normalizer-2.0.9-py3-none-any.whl (39 kB)
Collecting certifi>=2017.4.17
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Collecting idna<4,>=2.5
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Collecting tzdata
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Collecting pytz-deprecation-shim
  Downloading pytz_deprecation_shim-0.1.0.post0-py2.py3-none-any.whl (15 kB)
Using legacy 'setup.py install' for pympler, since package 'wheel' is not installed.
Using legacy 'setup.py install' for blinker, since package 'wheel' is not installed.
Installing collected packages: traitlets, six, pywin32, pyrsistent, attrs, wcwidth, tornado, pyzmq, python-dateutil, pyparsing, pycparser, parso, nest-asyncio, jupyter-core, jsonschema, ipython-genutils, entrypoints, webencodings, pygments, prompt-toolkit, pickleshare, packaging, nbformat, matplotlib-inline, MarkupSafe, jupyter-client, jedi, decorator, colorama, cffi, backcall, testpath, pywinpty, pandocfilters, nbclient, mistune, jupyterlab-pygments, jinja2, ipython, defusedxml, debugpy, bleach, argon2-cffi-bindings, terminado, Send2Trash, prometheus-client, nbconvert, ipykernel, argon2-cffi, notebook, widgetsnbextension, tzdata, smmap, pytz, numpy, jupyterlab-widgets, urllib3, typing-extensions, toolz, pytz-deprecation-shim, pandas, ipywidgets, idna, gitdb, charset-normalizer, certifi, watchdog, validators, tzlocal, toml, requests, pympler, pydeck, pyarrow, protobuf, pillow, gitpython, click, cachetools, blinker, base58, astor, altair, streamlit
  WARNING: The scripts jupyter-migrate.exe, jupyter-troubleshoot.exe and jupyter.exe are installed in 'C:\Users\randy\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.9_qbz5n2kfra8p0\LocalCache\local-packages\Python39\Scripts' which is not on PATH.
  Consider adding this directory to PATH or, if you prefer to suppress this warning, use --no-warn-script-location.
  WARNING: The script jsonschema.exe is installed in 'C:\Users\randy\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.9_qbz5n2kfra8p0\LocalCache\local-packages\Python39\Scripts' which is not on PATH.
  Consider adding this directory to PATH or, if you prefer to suppress this warning, use --no-warn-script-location.
  WARNING: The script pygmentize.exe is installed in 'C:\Users\randy\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.9_qbz5n2kfra8p0\LocalCache\local-packages\Python39\Scripts' which is not on PATH.
  Consider adding this directory to PATH or, if you prefer to suppress this warning, use --no-warn-script-location.
  WARNING: The script jupyter-trust.exe is installed in 'C:\Users\randy\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.9_qbz5n2kfra8p0\LocalCache\local-packages\Python39\Scripts' which is not on PATH.
  Consider adding this directory to PATH or, if you prefer to suppress this warning, use --no-warn-script-location.
  WARNING: The scripts jupyter-kernel.exe, jupyter-kernelspec.exe and jupyter-run.exe are installed in 'C:\Users\randy\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.9_qbz5n2kfra8p0\LocalCache\local-packages\Python39\Scripts' which is not on PATH.
  Consider adding this directory to PATH or, if you prefer to suppress this warning, use --no-warn-script-location.
  WARNING: The script jupyter-execute.exe is installed in 'C:\Users\randy\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.9_qbz5n2kfra8p0\LocalCache\local-packages\Python39\Scripts' which is not on PATH.
  Consider adding this directory to PATH or, if you prefer to suppress this warning, use --no-warn-script-location.
  WARNING: The scripts iptest.exe, iptest3.exe, ipython.exe and ipython3.exe are installed in 'C:\Users\randy\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.9_qbz5n2kfra8p0\LocalCache\local-packages\Python39\Scripts' which is not on PATH.
  Consider adding this directory to PATH or, if you prefer to suppress this warning, use --no-warn-script-location.
  WARNING: The script send2trash.exe is installed in 'C:\Users\randy\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.9_qbz5n2kfra8p0\LocalCache\local-packages\Python39\Scripts' which is not on PATH.
  Consider adding this directory to PATH or, if you prefer to suppress this warning, use --no-warn-script-location.
  WARNING: The scripts jupyter-dejavu.exe and jupyter-nbconvert.exe are installed in 'C:\Users\randy\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.9_qbz5n2kfra8p0\LocalCache\local-packages\Python39\Scripts' which is not on PATH.
  Consider adding this directory to PATH or, if you prefer to suppress this warning, use --no-warn-script-location.
  WARNING: The scripts jupyter-bundlerextension.exe, jupyter-nbextension.exe, jupyter-notebook.exe and jupyter-serverextension.exe are installed in 'C:\Users\randy\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.9_qbz5n2kfra8p0\LocalCache\local-packages\Python39\Scripts' which is not on PATH.
  Consider adding this directory to PATH or, if you prefer to suppress this warning, use --no-warn-script-location.
  WARNING: The script f2py.exe is installed in 'C:\Users\randy\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.9_qbz5n2kfra8p0\LocalCache\local-packages\Python39\Scripts' which is not on PATH.
  Consider adding this directory to PATH or, if you prefer to suppress this warning, use --no-warn-script-location.
  WARNING: The script normalizer.exe is installed in 'C:\Users\randy\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.9_qbz5n2kfra8p0\LocalCache\local-packages\Python39\Scripts' which is not on PATH.
  Consider adding this directory to PATH or, if you prefer to suppress this warning, use --no-warn-script-location.
  WARNING: The script watchmedo.exe is installed in 'C:\Users\randy\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.9_qbz5n2kfra8p0\LocalCache\local-packages\Python39\Scripts' which is not on PATH.
  Consider adding this directory to PATH or, if you prefer to suppress this warning, use --no-warn-script-location.
    Running setup.py install for pympler ... done
  WARNING: The script plasma_store.exe is installed in 'C:\Users\randy\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.9_qbz5n2kfra8p0\LocalCache\local-packages\Python39\Scripts' which is not on PATH.
  Consider adding this directory to PATH or, if you prefer to suppress this warning, use --no-warn-script-location.
    Running setup.py install for blinker ... done
  WARNING: The script base58.exe is installed in 'C:\Users\randy\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.9_qbz5n2kfra8p0\LocalCache\local-packages\Python39\Scripts' which is not on PATH.
  Consider adding this directory to PATH or, if you prefer to suppress this warning, use --no-warn-script-location.
  WARNING: The script streamlit.exe is installed in 'C:\Users\randy\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.9_qbz5n2kfra8p0\LocalCache\local-packages\Python39\Scripts' which is not on PATH.
  Consider adding this directory to PATH or, if you prefer to suppress this warning, use --no-warn-script-location.
Successfully installed MarkupSafe-2.0.1 Send2Trash-1.8.0 altair-4.1.0 argon2-cffi-21.2.0 argon2-cffi-bindings-21.2.0 astor-0.8.1 attrs-21.2.0 backcall-0.2.0 base58-2.1.1 bleach-4.1.0 blinker-1.4 cachetools-4.2.4 certifi-2021.10.8 cffi-1.15.0 charset-normalizer-2.0.9 click-7.1.2 colorama-0.4.4 debugpy-1.5.1 decorator-5.1.0 defusedxml-0.7.1 entrypoints-0.3 gitdb-4.0.9 gitpython-3.1.24 idna-3.3 ipykernel-6.6.0 ipython-7.30.1 ipython-genutils-0.2.0 ipywidgets-7.6.5 jedi-0.18.1 jinja2-3.0.3 jsonschema-4.2.1 jupyter-client-7.1.0 jupyter-core-4.9.1 jupyterlab-pygments-0.1.2 jupyterlab-widgets-1.0.2 matplotlib-inline-0.1.3 mistune-0.8.4 nbclient-0.5.9 nbconvert-6.3.0 nbformat-5.1.3 nest-asyncio-1.5.4 notebook-6.4.6 numpy-1.21.4 packaging-21.3 pandas-1.3.4 pandocfilters-1.5.0 parso-0.8.3 pickleshare-0.7.5 pillow-8.4.0 prometheus-client-0.12.0 prompt-toolkit-3.0.24 protobuf-3.19.1 pyarrow-6.0.1 pycparser-2.21 pydeck-0.7.1 pygments-2.10.0 pympler-0.9 pyparsing-3.0.6 pyrsistent-0.18.0 python-dateutil-2.8.2 pytz-2021.3 pytz-deprecation-shim-0.1.0.post0 pywin32-302 pywinpty-1.1.6 pyzmq-22.3.0 requests-2.26.0 six-1.16.0 smmap-5.0.0 streamlit-1.2.0 terminado-0.12.1 testpath-0.5.0 toml-0.10.2 toolz-0.11.2 tornado-6.1 traitlets-5.1.1 typing-extensions-4.0.1 tzdata-2021.5 tzlocal-4.1 urllib3-1.26.7 validators-0.18.2 watchdog-2.1.6 wcwidth-0.2.5 webencodings-0.5.1 widgetsnbextension-3.5.2
WARNING: You are using pip version 21.2.4; however, version 21.3.1 is available.
You should consider upgrading via the 'C:\Users\randy\AppData\Local\Microsoft\WindowsApps\PythonSoftwareFoundation.Python.3.9_qbz5n2kfra8p0\python.exe -m pip install --upgrade pip' command.
PS C:\Users\randy> streamlit hello
streamlit : The term 'streamlit' is not recognized as the name of a cmdlet, function, script file, or operable program. Check the spelling of the name, or if a path was included, verify
that the path is correct and try again.
At line:1 char:1
+ streamlit hello
+ ~~~~~~~~~
    + CategoryInfo          : ObjectNotFound: (streamlit:String) [], CommandNotFoundException
    + FullyQualifiedErrorId : CommandNotFoundException

PS C:\Users\randy> locate streamlit
locate : The term 'locate' is not recognized as the name of a cmdlet, function, script file, or operable program. Check the spelling of the name, or if a path was included, verify that the
path is correct and try again.
At line:1 char:1
+ locate streamlit
+ ~~~~~~
    + CategoryInfo          : ObjectNotFound: (locate:String) [], CommandNotFoundException
    + FullyQualifiedErrorId : CommandNotFoundException

PS C:\Users\randy> python -m streamlit hello

  Welcome to Streamlit!

  If you're one of our development partners or you're interested in getting
  personal technical support or Streamlit updates, please enter your email
  address below. Otherwise, you may leave the field blank.

  Email:

  Privacy Policy:
  As an open source project, we collect usage statistics. We cannot see and do
  not store information contained in Streamlit apps. You can find out more by
  reading our privacy policy at: https://streamlit.io/privacy-policy

  If you'd like to opt out of usage statistics, add the following to
  %userprofile%/.streamlit/config.toml, creating that file if necessary:

    [browser]
    gatherUsageStats = false


  Welcome to Streamlit. Check out our demo in your browser.

  Local URL: http://localhost:8501
  Network URL: http://10.0.2.15:8501

  Ready to create your own Python apps super quickly?
  Head over to https://docs.streamlit.io

  May you create awesome apps!

Best,
Randy