seLain

https://stackoverflow.com/questions/3042437/how-to-change-the-commit-author-for-one-specific-commit

git rebase -i <earliercommit>
for each commit you want to change:
    change the text from "pick" to "edit"
    git commit --amend --author="Author Name <email@address.com>"
    git rebase --continue
git rebase --continue

done

seLain

https://help.github.com/articles/checking-out-pull-requests-locally/

checkout from origin

git fetch origin pull/ID/head:BRANCHNAME
git checkout BRANCHNAME
<do modifications>
<add>
<commit>
git push origin BRANCHNAME

seLain

git fetch --all  # or whatever to make sure your repo consistent with origin
git checkout -b new_branch_for_single_change upstream/master # or origin mater, dependes where's your base source
git cherry-pick hashcode_of_specific_commit
git push -u origin new_branch_for_single_change  # push this new branch to origin

then create PR from new_branch_for_single_change branch on origin to upsteam

seLain

ref stackoverflow:
https://stackoverflow.com/questions/41283955/github-keeps-saying-this-branch-is-x-commits-ahead-y-commits-behind

works by
1. git remote add upstream https://github/upstream/repo.git
2. git pull --rebase upstream master
2.1 git rebase --skip  (if the conflicts are not true, skip the patches)
3. git push --force-with-lease origin master

If there are branches to fix

seLain

## useful refs
* https://realpython.com/deploying-a-django-app-to-aws-elastic-beanstalk/#Create.the.Admin.User
* https://docs.aws.amazon.com/elasticbeanstalk/latest/dg/create-deploy-python-django.html


## CLI approach
1. Enter your project root (versioned with Git)
2. install awsebcli
2.1 if encountering trouble installing PyYAML, using prepackages wheel: 
3. > eb init

seLain

This can be done in interactive python shell

> from django.core.management.utils import get_random_secret_key
> get_random_secret_key()

seLain

- Django does not automatically check max_lenght limitation before save()
- Django does not automatically check choices before save() --> it's for form

for the length limitation, using

datamodel.full_clean()
datamodel.save()

can resolve it. or, override save() to enforce full_clean()
ex:

seLain

ref: http://sushihangover.github.io/git-set-up-a-fetch-only-remote/

> git remote -v   # to see all remotes
> git remote set-url --push <remote_name> DISABLE

for example:
> git remote set-url --push upstream DISABLE

check again by 
> git remote -v

seLain

say you have ...
- upstream : https://github.com/xxxxx/project_a.git
- origin : https://github.com/yourself/fork_project_a.git

and there is a sibling project : https://github.com/community_contributor/fork_project_a.git

1. get into your git bash under fork_project_a
2. add sibling project as new remote: 
   git remote add community_contributor https://github.com/community_contributor/fork_project_a.git
3. git fetch (to update and also make sure new remote added)

seLain

import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.util.Scanner;

class Solution{

    public static void main(String[] args){
        Scanner in = new Scanner(System.in);
        while(in.hasNext()){
            String IP = in.next();