在 python 中出现 flask 的 ModuleNotFound 错误

Question

I installed the flask module via following command.[.[cmd image][1]][1] When I ran the following code.

from flask import Flask, render_template
app = Flask(__name__)
@app.route('/')
def index():
    #a = input('Enter name')
    return render_template(r'form.html')

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

It gave an error. ModuleNotFoundError: No module named 'flask'

Note:- I am not using virtualenv . And I am having my html page in templates folder [1]: https://i.stack.imgur.com/t4XzJ.png

Answer 1

It seems you have installed flask on the system wide environment. To access the flask in your virtualenv, you have to get into the virtualenv directory and activate it by using following command.

source virtual_env_name/bin/activate

replace 'virtual_env_name' with the virtualenv name you created. After that in your command line, you will get (virtual_env_name) added before. the current directory path.

Now you can install the flask framework using pip3.

pip3 install flask

Keep in mind to activate venv everytime you are using the flask.