from Flask import Flask ImportError: No module named Flask

Question

I am following the tutorial here.

My file looks like this:

from flask import Flask
app = Flask(__name__)

@app.route("/")
def main():
    return "Welcome!"

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

I run python app.py and get the following:

Traceback (most recent call last):
File "app.py", line 1, in <module>
from flask import Flask
ImportError: No module named Flask

I do have flask installed. I was thinking it's a $PATH issue. I don't really know where to begin as far as troubleshooting goes.

which flask gives me: /usr/local/bin/flask

which python gives me: /usr/bin/python

Any help is much appreciated, there are other similar issues out there but those solutions have not helped. Happy to answer any questions. Thank you.

Answers to questions:

Q. Which Python version? A. Python 2.7.10

Q. How did you install Flask? A. pip install flask

Answer 1

before run your app.py you need to activate your server by this command

. venv/bin/activate