#To home directory
$$ cd

#Create a Python virtual environment(myenv can be another name)
$$ python3 -m venv myenv

#Enable the Python virtual environment
$$ source myenv/bin/activate
#In the place of the environment name on the left(myenv)Is displayed, it is successful

#Keep pip up to date
$$ pip install --upgrade pip

#Install Flask
$$ pip install flask

#Check if there is a module in pip properly
$$ pip freeze

#Create a py file, this time it will run on Apache/var/www/Make in html
$$ vi /var/www/html/test.py

#I say it many times'i'Input mode, when input is finished'esc'、':wq'End of saving with
from flask import Flask
app = Flask(__name__)
 
@app.route('/')
def hello():
    return 'Hello World!'
 
if __name__ == '__main__':
#Flask is hosted by'0.0.0.0'It seems that it will not work otherwise, this area is essential
    app.run(host='0.0.0.0')

#Run in browser!
$$ python3 /var/www/html/test.py

# http://Public IP address set in AWS:Hello with connection to 5000!Should be doing

#End of Python virtual environment
$$ deactivate

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