Python Flask Cheatsheet
a cheatsheet so you dont have to remember everything
Routes
A route in Flask is a way of mapping a specific URL path to a Python function (known as a view function) that handles the web request and returns a response
BASIC TEMPLATE:
from flask import Flask
app = Flask(__name__)
@app.route("/")
def home():
return `<h1>hello</h1>`
if __name__ == "__main__":
app.run(debug=True)
URL & ROUTES
root:
@app.route("/")
taking variable:
@app.route('/add/<number>')
def add_func(number):
taking variable more than one:
@app.route('/add/<number>/<number>')
def add_func(number1,number2):
taking variable specific type:
@app.route('/add/<int:number>')
def add_func(number):
talking args from the requests:
/add?age=10
def add_func(number):
name = requests.args
// return dict
specific = requests.args.get("age")
POST Requests
only accept post request
@app.route('/hello',methods=["POST"])
def function():
````
only post and get request
@app.route('/hello',methods=["POST","GET"]) def function(): if request.method = "GET": return "you got get request" if request.method = "POST": return "you got post request" ````
TEMPLATES
you have to import Flask,render_template
add in starting
app = Flask(__name__,template_folders='templates')
structure:
project/
│
├── app.py
├── templates/
│ └── index.html
return a html file:
@app.route("/")
def home():
return render_template("index.html")
transfering variables in html file:
def home():
data = "hello"
return render_template("index.html",mydata=data)
inside the html:
use {{ variable }} when dynamic content or variables is passed
<p>{{mmydata}}</p>
we use {% ... %} (curly braces with percent signs) for if statements and for loops
for example a list is passed in mydata
we can do
{% for item in mydata %}
{{item}}
{% endfor %}
using if funciton
{% if mydata == "hello" %}
{{item}}
{% endif %}
template inheritance
for example you dont wanna use the starting stuff of the index.html or and what to use same in all we can use block {% block name %} ... {% endblock %}
block := Used in your "base" or parent file (often called base.html or layout.html), a block defines a section that child pages can fill with their own content
base.html
<!DOCTYPE html>
<html>
<head>
<title>{% block title %}My Site{% endblock %}</title>
</head>
<body>
<nav>Navigation Bar</nav>
<div class="main-content">
{% block content %}{% endblock %} <!-- Content from child pages goes here -->
</div>
<footer>Site Footer</footer>
</body>
</html>
index.html
{% extends "base.html" %}
{% block title %}Home Page{% endblock %}
{% block content %}
<h1>Welcome to the Home Page!</h1>
<p>This text is specific to the index page.</p>
{% endblock %}
Why use url_for?
Instead of hardcoding a link like<a href="/login">, you use{{ url_for('login') }}.
images & files
strucutre for using images,and static file
├── static/
│ ├── css/
│ │ └── style.css
│ ├── js/
│ │ └── script.js
│ └── img/
│ └── logo.png
use this for
app = Flask(__name__,template_folders='templates',static_folder='static',static_url_path='/')
insde html you wanna use image
<img src="/img/logo.png">