Das deutsche Python-Forum

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ps: C:/xxx/xxx/ virtualenv venv
install pip 
install setuptools
ps: c:/xxx/xxx/ venv/scripts/activate
(venv) c:/xxx/xxx/  install flask

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warning: no previously-included files matching '*pyo' found under directory 'docs'
warning: no previously-included files matching  '*pyc' found under directory 'examples'
warning: no previously-included files matching  '*pyc' found under directory 'tests'

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from flask import Flask
app = Flask(__name__)

@app.route('/')
def hello_world():
    return 'Hello World!'

if __name__ == '__main__':
    app.run()

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Traceback(most recent call last):
file "flask1.py" line1, in <module>
from flask import Flask
ImportError: cannot import name Flask