使用Python在Google Cloud Storage上读写JSON文件

Question

As said, I have a JSON file on a Cloud Storage bucket, is there a way to read (and modify) its content via Python?

@app.route("/myform/", methods=('GET', 'POST'))
def myform():
    form = MyForm()
    if form.validate_on_submit():
       return redirect('/')
    return render_template('my_form.html', form=form)

I would like to read a JSON on Google Cloud Storage and add to it the value defined by the form (a key and its value).

This is all on a Flask webapp running on a standard AppEngine.

Answer 1

Google Cloud Platform (GCP) has a sample Bookshelf tutorial that shows how to store persistent data on Cloud Storage using Flask framework in Python. Here is an example on how to create, read, update, and delete (CRUD) data stored in Cloud Storage.

Create:

@crud.route('/add', methods=['GET', 'POST'])
def add():
    if request.method == 'POST':
        data = request.form.to_dict(flat=True)
        book = get_model().create(data)
        return redirect(url_for('.view', id=book['id']))
    return render_template("form.html", action="Add", book={})

Read:

@crud.route("/")
def list():
    token = request.args.get('page_token', None)
    if token:
        token = token.encode('utf-8')
    books, next_page_token = get_model().list(cursor=token)
    return render_template(
        "list.html",
        books=books,
        next_page_token=next_page_token)

Update:

@crud.route('/<id>/edit', methods=['GET', 'POST'])
def edit(id):
    book = get_model().read(id)
if request.method == 'POST':
    data = request.form.to_dict(flat=True)
    book = get_model().update(data, id)
    return redirect(url_for('.view', id=book['id']))
return render_template("form.html", action="Edit", book=book)

Delete:

@crud.route('/<id>/delete')
def delete(id):
    get_model().delete(id)
    return redirect(url_for('.list'))

You can find more details on GCPs JSON API reference here .