Dropped Flasked Cheat sheet - Very Useful

README.md

@@ -1,3 +1,76 @@
 # Python3-Flask-Blog
 This is a flask based blog whose frontend is created using bootstrap.
 If you have any questions or suggestions, feel free to open an issue or pull request :)
+Flask is a web application framework written in Python. Armin Ronacher, who leads an international group of Python enthusiasts named Pocco, develops it. Flask is based on Werkzeug WSGI toolkit and Jinja2 template engine. Both are Pocco projects.
+
+Flask Cheat Sheet :
+#Barebones App
+from flask import Flask
+app = Flask(__name__)
+@app.route('/hello')
+def hello():
+ return 'Hello, World!'
+if __name__ == '__main__':
+ app.run(debug=True)
+#Flask Cheat Sheet and Quick Reference
+#Routing
+@app.route('/hello/<string:name>') # example.com/hello/Anthony
+def hello(name):
+ return 'Hello ' + name + '!' # returns hello Anthony!
+#Allowed Request Methods
+@app.route('/test') #default. only allows GET requests
+@app.route('/test', methods=['GET', 'POST']) #allows only GET and POST.
+@app.route('/test', methods=['PUT']) #allows only PUT
+#Configuration
+#direct access to config
+app.config['CONFIG_NAME'] = 'config value'
+#import from an exported environment variable with a path to a config file
+app.config.from_envvar('ENV_VAR_NAME')
+#Templates
+from flask import render_template
+@app.route('/')
+def index():
+ return render_template('template_file.html', var1=value1, ...)
+#JSON Responses
+import jsonify
+@app.route('/returnstuff')
+def returnstuff():
+ num_list = [1,2,3,4,5]
+ num_dict = {'numbers' : num_list, 'name' : 'Numbers'}
+ #returns {'output' : {'numbers' : [1,2,3,4,5], 'name' : 'Numbers'}}
+ return jsonify({'output' : num_dict})
+#Access Request Data
+request.args['name'] #query string arguments
+request.form['name'] #form data
+request.method #request type
+request.cookies.get('cookie_name') #cookies
+request.files['name'] #files
+#Redirect
+from flask import url_for, redirect
+@app.route('/home')
+def home():
+ return render_template('home.html')
+@app.route('/redirect')
+def redirect_example():
+ return redirect(url_for('index')) #sends user to /home
+#Abort
+from flask import abort()
+@app.route('/')
+def index():
+ abort(404) #returns 404 error
+ render_template('index.html') #this never gets executed
+#Set Cookie
+from flask import make_response
+@app.route('/')
+def index():
+ resp = make_response(render_template('index.html'))
+ resp.set_cookie('cookie_name', 'cookie_value')
+ return resp
+#Session Handling
+import session
+app.config['SECRET_KEY'] = 'any random string' #must be set to use sessions
+#set session
+@app.route('/login_success')
+def login_success():
+ session['key_name'] = 'key_value' #stores a secure cookie in browser
+ return redirect(url_for('index'))