Error in executing WebApp.py

[biswajeetbhatta]

While running WebApp.py, it's showing ImportError: No module named flask
Again tried installing Flask and the requirements got satisfied. Same error is showing. Please help in fixing the issue.

Thank you.
BISWAJEET BHATTA

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biswajeetbhatta@BISWAJEETs-MacBook-Air system % sudo python3 -m pip install flask
Password:
WARNING: The directory '/Users/biswajeetbhatta/Library/Caches/pip' or its parent directory is not owned or is not writable by the current user. The cache has been disabled. Check the permissions and owner of that directory. If executing pip with sudo, you should use sudo's -H flag.
Requirement already satisfied: flask in /Library/Python/3.8/site-packages (2.0.3)
Requirement already satisfied: Werkzeug>=2.0 in /Library/Python/3.8/site-packages (from flask) (2.0.3)
Requirement already satisfied: click>=7.1.2 in /Library/Python/3.8/site-packages (from flask) (8.0.4)
Requirement already satisfied: itsdangerous>=2.0 in /Library/Python/3.8/site-packages (from flask) (2.1.0)
Requirement already satisfied: Jinja2>=3.0 in /Library/Python/3.8/site-packages (from flask) (3.0.3)
Requirement already satisfied: MarkupSafe>=2.0 in /Library/Python/3.8/site-packages (from Jinja2>=3.0->flask) (2.1.0)
WARNING: Running pip as the 'root' user can result in broken permissions and conflicting behaviour with the system package manager. It is recommended to use a virtual environment instead: https://pip.pypa.io/warnings/venv
biswajeetbhatta@BISWAJEETs-MacBook-Air system % python WebApp.py
Traceback (most recent call last):
File "WebApp.py", line 19, in
from flask import Flask, render_template, Response, redirect, url_for, request, jsonify, send_file, session, g
ImportError: No module named flask
biswajeetbhatta@BISWAJEETs-MacBook-Air system % python WebApp.py
Traceback (most recent call last):
File "WebApp.py", line 19, in
from flask import flask, render_template, Response, redirect, url_for, request, jsonify, send_file, session, g
ImportError: No module named flask
biswajeetbhatta@BISWAJEETs-MacBook-Air system %