execute hello world with flask "ImportError: No module named flask"

Question

I'm trying to use flask and python. I did a simple file named hello.py. tHis file contains this code:

from flask import Flask app = Flask(__name__)   @app.route("/") def main():     return "Welcome!"  if __name__ == "__main__":     app.run() 

This is a simple hello world with flask. I want to execute it but actually, I have a problem. In the terminal, I typed python hello.py and I get this error:

File "hello.py", line 1, in <module> from flask import Flask ImportError: No module named flask 

Even that I installed flask globally. I understand that this is a basic question, but I'm stuck?

Answer 1

You don't have installed flask

Linux:

Install flask as global package:

sudo pip install flask 

Install in virtualenv

virtualenv venv source venv pip install flask 

Install system package

• debian, ubuntu

  apt-get install python-flask 

• arch

  pacman -S python-flask 

• fedora

  yum install python-flask 

Install via Anaconda

conda install flask 

Windows:

python -m pip install flask