git push heroku master 产生“没有任何变化”但不识别本地变化？

Question

I am working on a website (django) that I uploaded online with heroku. Everything worked fine until I had to make a change in my views.py. Now when I do:

- git add .
- git commit -m "smtg"
- git push heroku master 

It tells me that nothing change but I made some changes, it seems like it cannot see those. When I try git init it tells me "

Reinitialized existing Git repository in C:/Users/Loic/Documents/my_site2/.git/

" Could you please help me it is a school project. Thank you

EDIT: now after git push heroku master I have:

 To https://git.heroku.com/cleanpharmacycle.git
 ! [rejected]        master -> master (non-fast-forward)
error: failed to push some refs to 'https://git.heroku.com/cleanpharmacycle.git'
hint: Updates were rejected because the tip of your current branch is behind
hint: its remote counterpart. Integrate the remote changes (e.g.
hint: 'git pull ...') before pushing again.
hint: See the 'Note about fast-forwards' in 'git push --help' for details.

Answer 1

Check your current branch is master.

 git branch 

If the pointer is not pointing the master, then check out to master branch

git checkout master

git push heroku yourlocalbranch:master if you want to push your local, non master branch to heroku master

Commit your changes and try to push to heroku

git commit -am "xxxyyzzz"    
git push heroku master