インストールといっても、「ライブラリの追加」って感じでとても簡単です。
インストール手順
-- 仮想環境の作成
python -m venv myenv
-- 仮想環境のアクティブ化
.\myenv\Scripts\activate
-- Flaskのインストール
pip install Flask
-- インストール後確認
python -m flask --version
-- 仮想環境の非アクティブ化
deactivate実行例
flask-apl >> python -m venv myenv
flask-apl >> .\myenv\Scripts\activate
(myenv) flask-apl >> where python
(myenv) flask-apl >> python app.py
Traceback (most recent call last):
File "C:\python-prj\flask-apl\app.py", line 1, in <module>
from flask import Flask, render_template, request
ModuleNotFoundError: No module named 'flask'
(myenv) flask-apl >> pip install flask
Collecting flask
Using cached flask-3.1.1-py3-none-any.whl.metadata (3.0 kB)
Collecting blinker>=1.9.0 (from flask)
Using cached blinker-1.9.0-py3-none-any.whl.metadata (1.6 kB)
Collecting click>=8.1.3 (from flask)
Using cached click-8.2.0-py3-none-any.whl.metadata (2.5 kB)
Collecting itsdangerous>=2.2.0 (from flask)
Using cached itsdangerous-2.2.0-py3-none-any.whl.metadata (1.9 kB)
Collecting jinja2>=3.1.2 (from flask)
Using cached jinja2-3.1.6-py3-none-any.whl.metadata (2.9 kB)
Collecting markupsafe>=2.1.1 (from flask)
Using cached MarkupSafe-3.0.2-cp312-cp312-win_amd64.whl.metadata (4.1 kB)
Collecting werkzeug>=3.1.0 (from flask)
Using cached werkzeug-3.1.3-py3-none-any.whl.metadata (3.7 kB)
Collecting colorama (from click>=8.1.3->flask)
Using cached colorama-0.4.6-py2.py3-none-any.whl.metadata (17 kB)
Using cached flask-3.1.1-py3-none-any.whl (103 kB)
Using cached blinker-1.9.0-py3-none-any.whl (8.5 kB)
Using cached click-8.2.0-py3-none-any.whl (102 kB)
Using cached itsdangerous-2.2.0-py3-none-any.whl (16 kB)
Using cached jinja2-3.1.6-py3-none-any.whl (134 kB)
Using cached MarkupSafe-3.0.2-cp312-cp312-win_amd64.whl (15 kB)
Using cached werkzeug-3.1.3-py3-none-any.whl (224 kB)
Using cached colorama-0.4.6-py2.py3-none-any.whl (25 kB)
Installing collected packages: markupsafe, itsdangerous, colorama, blinker, werkzeug, jinja2, click, flask
Successfully installed blinker-1.9.0 click-8.2.0 colorama-0.4.6 flask-3.1.1 itsdangerous-2.2.0 jinja2-3.1.6 markupsafe-3.0.2 werkzeug-3.1.3
[notice] A new release of pip is available: 24.0 -> 25.1.1
[notice] To update, run: python.exe -m pip install --upgrade pip
(myenv) flask-apl >>
(myenv) flask-apl >> python -m flask --version
Python 3.12.4
Flask 3.1.1
Werkzeug 3.1.3
