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Downloading Python3 needs Homebrew
/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install.sh)"
Now insert Homebrew directory on your PATH environment variable to start using it
export PATH="/usr/local/opt/python/libexec/bin:$PATH"
If you have OS X 10.12 (Sierra) or older
export PATH=/usr/local/bin:/usr/local/sbin:$PATH
Now install Python3
brew install python
Then check if Python3 is working on your system
python3 --version
Download PIP from their website using curl command
curl https://bootstrap.pypa.io/get-pip.py -o get-pip.py
Now install downloaded packages from PIP
python3 get-pip.py
Then check if PIP is working
pip --version
Install flask and its required modules
pip3 install flask flask_login flask_bcrypt flask_wtf wtforms email_validator
git basics: https://www.atlassian.com/git
Do this before changing something or pushing your changes
git pull
To check the status if you have changed something
git status
To add all changed files to a commit
git add .
To make a commit - yourmessage can be anything straightforward to what you did
git commit -m "yourmessage"
To make a push to the Github repository (updating files in Github)
git push
If it is asking you to login
git config --global user.name "your-github-username"
git config --global user.email "your-github-email"