Anaconda の base 環境に Streamlit を直接インストールしても良いのですが，ここでは，仮想環境を構築し，仮想環境の中に Streamlit をインストールすることとします．まず，Documents フォルダの中に streamlit フォルダを作成した後，Anaconda Prompt でそのフォルダに移動します．
(base) C:\Users\UserName>cd Documents ⏎ (base) C:\Users\UserName\Documents>dir ⏎ ドライブ C のボリューム ラベルは Main です ボリューム シリアル番号は 12D8-4AB8 です C:\Users\UserName\Documents のディレクトリ 2025/07/02 15:33 <DIR> . 2025/07/02 15:33 <DIR> .. 2024/04/02 16:09 <DIR> AmosDevelopment 2021/01/28 17:47 <DIR> IBM 2021/03/12 14:22 <DIR> mteleco 2021/02/08 13:06 <DIR> My Digital Editions 2021/03/12 14:21 <DIR> Office のカスタム テンプレート 2025/07/02 15:33 <DIR> streamlit 2021/01/28 17:52 <DIR> Visual Studio 2019 2021/02/08 13:19 <DIR> サウンド レコーディング 2023/09/12 16:57 <DIR> マイ Tableau Prep リポジトリ 2023/09/12 16:50 <DIR> マイ Tableau リポジトリ 0 個のファイル 0 バイト 12 個のディレクトリ 68,282,204,160 バイトの空き領域 (base) C:\Users\UserName\Documents>cd streamlit ⏎ (base) C:\Users\UserName\Documents\streamlit>
次に，作成済みの仮想環境の一覧を確認します．まだ仮想環境を作成していないので，base 環境のみが表示されました．このとき，作成した仮想環境を有効にするためのコマンドがヒントとして表示されていることにも注意してください．
(base) C:\Users\UserName\Documents\streamlit>conda env list ⏎ # conda environments: # base * C:\ProgramData\anaconda3 (base) C:\Users\UserName\Documents\streamlit>
次のコマンドで Python のバージョンに 3.12 を指定した仮想環境を作成し，その環境名に py312stream を設定します．
(base) C:\Users\UserName\Documents\streamlit>conda create -n py312stream python=3.12 ⏎ Channels: - defaults Platform: win-64 Collecting package metadata (repodata.json): done Solving environment: done ## Package Plan ## environment location: C:\ProgramData\anaconda3\envs\py312stream added / updated specs: - python=3.12 The following packages will be downloaded: package | build ---------------------------|----------------- expat-2.7.1 | h8ddb27b_0 259 KB pip-25.1 | pyhc872135_2 1.3 MB python-3.12.11 | h716150d_0 16.5 MB setuptools-78.1.1 | py312haa95532_0 2.2 MB tk-8.6.14 | h5e9d12e_1 3.5 MB tzdata-2025b | h04d1e81_0 116 KB vc-14.42 | haa95532_5 11 KB vs2015_runtime-14.42.34433 | hbfb602d_5 1.2 MB wheel-0.45.1 | py312haa95532_0 177 KB xz-5.6.4 | h4754444_1 280 KB ------------------------------------------------------------ Total: 25.5 MB The following NEW packages will be INSTALLED: bzip2 pkgs/main/win-64::bzip2-1.0.8-h2bbff1b_6 ca-certificates pkgs/main/win-64::ca-certificates-2025.2.25-haa95532_0 expat pkgs/main/win-64::expat-2.7.1-h8ddb27b_0 libffi pkgs/main/win-64::libffi-3.4.4-hd77b12b_1 openssl pkgs/main/win-64::openssl-3.0.16-h3f729d1_0 pip pkgs/main/noarch::pip-25.1-pyhc872135_2 python pkgs/main/win-64::python-3.12.11-h716150d_0 setuptools pkgs/main/win-64::setuptools-78.1.1-py312haa95532_0 sqlite pkgs/main/win-64::sqlite-3.45.3-h2bbff1b_0 tk pkgs/main/win-64::tk-8.6.14-h5e9d12e_1 tzdata pkgs/main/noarch::tzdata-2025b-h04d1e81_0 vc pkgs/main/win-64::vc-14.42-haa95532_5 vs2015_runtime pkgs/main/win-64::vs2015_runtime-14.42.34433-hbfb602d_5 wheel pkgs/main/win-64::wheel-0.45.1-py312haa95532_0 xz pkgs/main/win-64::xz-5.6.4-h4754444_1 zlib pkgs/main/win-64::zlib-1.2.13-h8cc25b3_1 Proceed ([y]/n)? y ⏎ done # # To activate this environment, use # # $ conda activate py312stream # # To deactivate an active environment, use # # $ conda deactivate (base) C:\Users\UserName\Documents\streamlit>
もう一度，仮想環境の一覧を確認します．py312stream が作成されていますが，* 印が付いている base 環境が有効であることが分かります．
(base) C:\Users\UserName\Documents\streamlit>conda env list ⏎ # conda environments: # base * C:\ProgramData\anaconda3 py312stream C:\ProgramData\anaconda3\envs\py312stream (base) C:\Users\UserName\Documents\streamlit>
仮想環境 py312stream を有効化します．
(base) C:\Users\UserName\Documents\streamlit>conda activate py312stream ⏎
(py312stream) C:\Users\UserName\Documents\streamlit>
現時点でインストールされているパッケージを一覧で確認します．仮想環境の設定直後であるので，インストールされているパッケージの数はごくわずかです．
(py312stream) C:\Users\UserName\Documents\streamlit>pip list ⏎
Package Version
---------- -------
pip 25.1
setuptools 78.1.1
wheel 0.45.1
(py312stream) C:\Users\UserName\Documents\streamlit>
いよいよ streamlit をインストールします．Streamlit をインストールすると，関連する多くのパッケージもインストールされることが分かります．
(py312stream) C:\Users\UserName\Documents\streamlit>pip install streamlit ⏎ Collecting streamlit Downloading streamlit-1.46.1-py3-none-any.whl.metadata (9.0 kB) Collecting altair<6,>=4.0 (from streamlit) Downloading altair-5.5.0-py3-none-any.whl.metadata (11 kB) Collecting blinker<2,>=1.5.0 (from streamlit) Downloading blinker-1.9.0-py3-none-any.whl.metadata (1.6 kB) Collecting cachetools<7,>=4.0 (from streamlit) Downloading cachetools-6.1.0-py3-none-any.whl.metadata (5.4 kB) Collecting click<9,>=7.0 (from streamlit) Downloading click-8.2.1-py3-none-any.whl.metadata (2.5 kB) Collecting numpy<3,>=1.23 (from streamlit) Downloading numpy-2.3.1-cp312-cp312-win_amd64.whl.metadata (60 kB) Collecting packaging<26,>=20 (from streamlit) Downloading packaging-25.0-py3-none-any.whl.metadata (3.3 kB) Collecting pandas<3,>=1.4.0 (from streamlit) Downloading pandas-2.3.0-cp312-cp312-win_amd64.whl.metadata (19 kB) Collecting pillow<12,>=7.1.0 (from streamlit) Downloading pillow-11.3.0-cp312-cp312-win_amd64.whl.metadata (9.2 kB) Collecting protobuf<7,>=3.20 (from streamlit) Downloading protobuf-6.31.1-cp310-abi3-win_amd64.whl.metadata (593 bytes) Collecting pyarrow>=7.0 (from streamlit) Downloading pyarrow-20.0.0-cp312-cp312-win_amd64.whl.metadata (3.4 kB) Collecting requests<3,>=2.27 (from streamlit) Downloading requests-2.32.4-py3-none-any.whl.metadata (4.9 kB) Collecting tenacity<10,>=8.1.0 (from streamlit) Downloading tenacity-9.1.2-py3-none-any.whl.metadata (1.2 kB) Collecting toml<2,>=0.10.1 (from streamlit) Downloading toml-0.10.2-py2.py3-none-any.whl.metadata (7.1 kB) Collecting typing-extensions<5,>=4.4.0 (from streamlit) Downloading typing_extensions-4.14.0-py3-none-any.whl.metadata (3.0 kB) Collecting watchdog<7,>=2.1.5 (from streamlit) Downloading watchdog-6.0.0-py3-none-win_amd64.whl.metadata (44 kB) Collecting gitpython!=3.1.19,<4,>=3.0.7 (from streamlit) Downloading GitPython-3.1.44-py3-none-any.whl.metadata (13 kB) Collecting pydeck<1,>=0.8.0b4 (from streamlit) Downloading pydeck-0.9.1-py2.py3-none-any.whl.metadata (4.1 kB) Collecting tornado!=6.5.0,<7,>=6.0.3 (from streamlit) Downloading tornado-6.5.1-cp39-abi3-win_amd64.whl.metadata (2.9 kB) Collecting jinja2 (from altair<6,>=4.0->streamlit) Downloading jinja2-3.1.6-py3-none-any.whl.metadata (2.9 kB) Collecting jsonschema>=3.0 (from altair<6,>=4.0->streamlit) Downloading jsonschema-4.24.0-py3-none-any.whl.metadata (7.8 kB) Collecting narwhals>=1.14.2 (from altair<6,>=4.0->streamlit) Downloading narwhals-1.45.0-py3-none-any.whl.metadata (11 kB) Collecting colorama (from click<9,>=7.0->streamlit) Downloading colorama-0.4.6-py2.py3-none-any.whl.metadata (17 kB) Collecting gitdb<5,>=4.0.1 (from gitpython!=3.1.19,<4,>=3.0.7->streamlit) Downloading gitdb-4.0.12-py3-none-any.whl.metadata (1.2 kB) Collecting smmap<6,>=3.0.1 (from gitdb<5,>=4.0.1->gitpython!=3.1.19,<4,>=3.0.7->streamlit) Downloading smmap-5.0.2-py3-none-any.whl.metadata (4.3 kB) Collecting python-dateutil>=2.8.2 (from pandas<3,>=1.4.0->streamlit) Downloading python_dateutil-2.9.0.post0-py2.py3-none-any.whl.metadata (8.4 kB) Collecting pytz>=2020.1 (from pandas<3,>=1.4.0->streamlit) Downloading pytz-2025.2-py2.py3-none-any.whl.metadata (22 kB) Collecting tzdata>=2022.7 (from pandas<3,>=1.4.0->streamlit) Downloading tzdata-2025.2-py2.py3-none-any.whl.metadata (1.4 kB) Collecting charset_normalizer<4,>=2 (from requests<3,>=2.27->streamlit) Downloading charset_normalizer-3.4.2-cp312-cp312-win_amd64.whl.metadata (36 kB) Collecting idna<4,>=2.5 (from requests<3,>=2.27->streamlit) Downloading idna-3.10-py3-none-any.whl.metadata (10 kB) Collecting urllib3<3,>=1.21.1 (from requests<3,>=2.27->streamlit) Downloading urllib3-2.5.0-py3-none-any.whl.metadata (6.5 kB) Collecting certifi>=2017.4.17 (from requests<3,>=2.27->streamlit) Downloading certifi-2025.6.15-py3-none-any.whl.metadata (2.4 kB) Collecting MarkupSafe>=2.0 (from jinja2->altair<6,>=4.0->streamlit) Downloading MarkupSafe-3.0.2-cp312-cp312-win_amd64.whl.metadata (4.1 kB) Collecting attrs>=22.2.0 (from jsonschema>=3.0->altair<6,>=4.0->streamlit) Downloading attrs-25.3.0-py3-none-any.whl.metadata (10 kB) Collecting jsonschema-specifications>=2023.03.6 (from jsonschema>=3.0->altair<6,>=4.0->streamlit) Downloading jsonschema_specifications-2025.4.1-py3-none-any.whl.metadata (2.9 kB) Collecting referencing>=0.28.4 (from jsonschema>=3.0->altair<6,>=4.0->streamlit) Downloading referencing-0.36.2-py3-none-any.whl.metadata (2.8 kB) Collecting rpds-py>=0.7.1 (from jsonschema>=3.0->altair<6,>=4.0->streamlit) Downloading rpds_py-0.26.0-cp312-cp312-win_amd64.whl.metadata (4.3 kB) Collecting six>=1.5 (from python-dateutil>=2.8.2->pandas<3,>=1.4.0->streamlit) Downloading six-1.17.0-py2.py3-none-any.whl.metadata (1.7 kB) Downloading streamlit-1.46.1-py3-none-any.whl (10.1 MB) ---------------------------------------- 10.1/10.1 MB 78.3 MB/s eta 0:00:00 Downloading altair-5.5.0-py3-none-any.whl (731 kB) 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Downloading requests-2.32.4-py3-none-any.whl (64 kB) Downloading charset_normalizer-3.4.2-cp312-cp312-win_amd64.whl (105 kB) Downloading idna-3.10-py3-none-any.whl (70 kB) Downloading smmap-5.0.2-py3-none-any.whl (24 kB) Downloading tenacity-9.1.2-py3-none-any.whl (28 kB) Downloading toml-0.10.2-py2.py3-none-any.whl (16 kB) Downloading tornado-6.5.1-cp39-abi3-win_amd64.whl (444 kB) Downloading typing_extensions-4.14.0-py3-none-any.whl (43 kB) Downloading urllib3-2.5.0-py3-none-any.whl (129 kB) Downloading watchdog-6.0.0-py3-none-win_amd64.whl (79 kB) Downloading certifi-2025.6.15-py3-none-any.whl (157 kB) Downloading jinja2-3.1.6-py3-none-any.whl (134 kB) Downloading jsonschema-4.24.0-py3-none-any.whl (88 kB) Downloading attrs-25.3.0-py3-none-any.whl (63 kB) Downloading jsonschema_specifications-2025.4.1-py3-none-any.whl (18 kB) Downloading MarkupSafe-3.0.2-cp312-cp312-win_amd64.whl (15 kB) Downloading narwhals-1.45.0-py3-none-any.whl (371 kB) Downloading pyarrow-20.0.0-cp312-cp312-win_amd64.whl (25.7 MB) ---------------------------------------- 25.7/25.7 MB 85.5 MB/s eta 0:00:00 Downloading python_dateutil-2.9.0.post0-py2.py3-none-any.whl (229 kB) Downloading pytz-2025.2-py2.py3-none-any.whl (509 kB) Downloading referencing-0.36.2-py3-none-any.whl (26 kB) Downloading rpds_py-0.26.0-cp312-cp312-win_amd64.whl (234 kB) Downloading six-1.17.0-py2.py3-none-any.whl (11 kB) Downloading tzdata-2025.2-py2.py3-none-any.whl (347 kB) Downloading colorama-0.4.6-py2.py3-none-any.whl (25 kB) Installing collected packages: pytz, watchdog, urllib3, tzdata, typing-extensions, tornado, toml, tenacity, smmap, six, rpds-py, pyarrow, protobuf, pillow, packaging, numpy, narwhals, MarkupSafe, idna, colorama, charset_normalizer, certifi, cachetools, blinker, attrs, requests, referencing, python-dateutil, jinja2, gitdb, click, pydeck, pandas, jsonschema-specifications, gitpython, jsonschema, altair, streamlit Successfully installed MarkupSafe-3.0.2 altair-5.5.0 attrs-25.3.0 blinker-1.9.0 cachetools-6.1.0 certifi-2025.6.15 charset_normalizer-3.4.2 click-8.2.1 colorama-0.4.6 gitdb-4.0.12 gitpython-3.1.44 idna-3.10 jinja2-3.1.6 jsonschema-4.24.0 jsonschema-specifications-2025.4.1 narwhals-1.45.0 numpy-2.3.1 packaging-25.0 pandas-2.3.0 pillow-11.3.0 protobuf-6.31.1 pyarrow-20.0.0 pydeck-0.9.1 python-dateutil-2.9.0.post0 pytz-2025.2 referencing-0.36.2 requests-2.32.4 rpds-py-0.26.0 six-1.17.0 smmap-5.0.2 streamlit-1.46.1 tenacity-9.1.2 toml-0.10.2 tornado-6.5.1 typing-extensions-4.14.0 tzdata-2025.2 urllib3-2.5.0 watchdog-6.0.0 (py312stream) C:\Users\UserName\Documents\streamlit>
今回はゴチバトルの問題を解くために，ortoolpy もインストールします．
py312stream) C:\Users\UserName\Documents\streamlit>pip install ortoolpy ⏎ Collecting ortoolpy Downloading ortoolpy-0.9.0-py3-none-any.whl.metadata (5.8 kB) Collecting more-itertools>=10.7.0 (from ortoolpy) Downloading more_itertools-10.7.0-py3-none-any.whl.metadata (37 kB) Requirement already satisfied: pandas>=2.3.0 in c:\programdata\anaconda3\envs\py312stream\lib\site-packages (from ortoolpy) (2.3.0) Collecting pulp>=3.2.1 (from ortoolpy) Downloading pulp-3.2.1-py3-none-any.whl.metadata (6.9 kB) Requirement already satisfied: numpy>=1.26.0 in c:\programdata\anaconda3\envs\py312stream\lib\site-packages (from pandas>=2.3.0->ortoolpy) (2.3.1) Requirement already satisfied: python-dateutil>=2.8.2 in c:\programdata\anaconda3\envs\py312stream\lib\site-packages (from pandas>=2.3.0->ortoolpy) (2.9.0.post0) Requirement already satisfied: pytz>=2020.1 in c:\programdata\anaconda3\envs\py312stream\lib\site-packages (from pandas>=2.3.0->ortoolpy) (2025.2) Requirement already satisfied: tzdata>=2022.7 in c:\programdata\anaconda3\envs\py312stream\lib\site-packages (from pandas>=2.3.0->ortoolpy) (2025.2) Requirement already satisfied: six>=1.5 in c:\programdata\anaconda3\envs\py312stream\lib\site-packages (from python-dateutil>=2.8.2->pandas>=2.3.0->ortoolpy) (1.17.0) Downloading ortoolpy-0.9.0-py3-none-any.whl (28 kB) Downloading more_itertools-10.7.0-py3-none-any.whl (65 kB) Downloading pulp-3.2.1-py3-none-any.whl (16.4 MB) ---------------------------------------- 16.4/16.4 MB 73.6 MB/s eta 0:00:00 Installing collected packages: pulp, more-itertools, ortoolpy Successfully installed more-itertools-10.7.0 ortoolpy-0.9.0 pulp-3.2.1 (py312stream) C:\Users\UserName\Documents\streamlit>
ここでインストール済みのパッケージを一覧で確認します．今回インストールされたのは streamlit 1.46.1 です．
(py312stream) C:\Users\UserName\Documents\streamlit>pip list ⏎ Package Version ------------------------- ----------- altair 5.5.0 attrs 25.3.0 blinker 1.9.0 cachetools 6.1.0 certifi 2025.6.15 charset-normalizer 3.4.2 click 8.2.1 colorama 0.4.6 gitdb 4.0.12 GitPython 3.1.44 idna 3.10 Jinja2 3.1.6 jsonschema 4.24.0 jsonschema-specifications 2025.4.1 MarkupSafe 3.0.2 more-itertools 10.7.0 narwhals 1.45.0 numpy 2.3.1 ortoolpy 0.9.0 packaging 25.0 pandas 2.3.0 pillow 11.3.0 pip 25.1 protobuf 6.31.1 PuLP 3.2.1 pyarrow 20.0.0 pydeck 0.9.1 python-dateutil 2.9.0.post0 pytz 2025.2 referencing 0.36.2 requests 2.32.4 rpds-py 0.26.0 setuptools 78.1.1 six 1.17.0 smmap 5.0.2 streamlit 1.46.1 tenacity 9.1.2 toml 0.10.2 tornado 6.5.1 typing_extensions 4.14.0 tzdata 2025.2 urllib3 2.5.0 watchdog 6.0.0 wheel 0.45.1 (py312stream) C:\Users\UserName\Documents\streamlit>