Hello World, Welcome to projectsplaza.com. Today I am going to discuss how to create a bar chart image with the Matplotlib in Django 3. We will create a bar chart according to data and save a png image and then display this image in the Django template. I have divided this tutorial into the following parts:
I have assumed that you have basic knowledge of Django. If you are new to Django then please see our beginner tutorials.
According to the official website: Matplotlib is a comprehensive library for creating static, animated, and interactive visualizations in Python.
First of all, we will install the Matplotlib package with the following command.
pip install matplotlib
Add this package to your project-level settings.py in the installed apps list.
In this step, we will create a method to create a piechart with the matplotlib package. Add the following method in views.py file.
# MatPlotLib
import matplotlib
matplotlib.use('Agg')
from matplotlib import pyplot as plt
import numpy as np
# Pie Chart
def piechart(request):
# Pie chart, where the slices will be ordered and plotted counter-clockwise:
labels = 'Sale', 'Purchase'
sizes = [random.randint(10,30), random.randint(30,50)]
explode = (0.1, 0) # only "explode" the 2nd slice (i.e. 'Hogs')
fig1, ax1 = plt.subplots()
ax1.pie(sizes, explode=explode, labels=labels, autopct='%1.1f%%',
shadow=True, startangle=90)
ax1.axis('equal') # Equal aspect ratio ensures that pie is drawn as a circle.
plt.savefig('media/sale_purchase_peichart.png',dpi=100)
return render(request,'piechart.html')
In the above code, We are passing random numbers for sale and purchase value. Every time you refresh you will see the different piechart. You can replace the random number with dynamic values. We are showing a piechart as an image so we will do the following things to show the image.
from . import views
from django.conf import settings
from django.conf.urls.static import static
urlpatterns=[
path('',views.piechart,name='piechart')
]
urlpatterns += static(settings.MEDIA_URL, document_root=settings.MEDIA_ROOT)
Till now we have saved the piechart in the folder. In this step, we will show the image in the Django template.
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>PieChart with Matplotlib</title>
</head>
<body>
<h3>Sale Purchase Via PieChart</h3>
<hr/>
<img src="./media/sale_purchase_peichart.png" />
</body>
</html>
When you will run the application in the browser, you will see the following screen.
Hello World, Welcome to ProjectsPlaza.com. Today we will create login signup and logout with the user model in Django 3. In this tutorial, we will use the user model which comes with Django. Signup functionality does not come with Django but provides a UserCreationForm class to create signup functionality. This is a small but full-fledged app. You can download this app from GitHub. I will create an accounts app in an existing project. I have divided this tutorial into the following parts:
I have assumed that you have installed django and you have already a project. If not then please see my todo tutorial.
In this step, we will create accounts app with the following command
py manage.py startapp accounts
In this step, we will connect our newly created app with a project in projects/settings.py
INSTALLED_APPS = [
...
'accounts',
]
In this step, we will connect our accounts app URL with the project URL. Open project/urls.py and add the following code.
urlpatterns = [
...
path('accounts/',include('django.contrib.auth.urls')),
path('accounts/',include('accounts.urls')),
]
Here we have attached two paths. One is from Django auth functionality and another is from the accounts app. We need to create accounts/urls.py and add the following code.
from django.urls import path
from .views import SignUp,home
urlpatterns=[
path('home/',home,name='home'),
path('signup/',SignUp.as_view(),name='signup'),
]
In the next section, we will create a login, signup, and home views.
When we try to access http://127.0.0.1:8000/accounts/login, it will try to find associated login file in accounts/templates/registration/login.html. So let’s create the login.html file in the relative folder and add the following code.
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Login</title>
</head>
<body>
<h3>Login</h3>
<hr/>
<form action="." method="post">
{% csrf_token %}
<table>
{{form.as_table}}
<tr>
<td colspan="2">
<hr/>
<button colspan="2">Submit</button>
</td>
</tr>
</table>
</form>
</body>
</html>
When you run the server, you will see the following screenshot.
Open accounts.views.py file and add the following code in it.
from django.shortcuts import render
from django.urls import reverse_lazy
from django.views import generic
from django.contrib.auth.forms import UserCreationForm
def home(request):
return render(request,'home.html')
# Sign Up
class SignUp(generic.CreateView):
form_class=UserCreationForm
success_url=reverse_lazy('login')
template_name='registration/signup.html'
As you can see, we have created two methods. One if for the home template and another is for the signup template. When the user successfully login, logout, or signup then we will redirect to this home view.
When you access the http://127.0.0.1:8000/accounts/signup, You will see the following screen
In this step, we will set up redirect after a successful login or after successful logout. Open project settings.py file and add the following next-to-last-line.
LOGIN_REDIRECT_URL='home' LOGOUT_REDIRECT_URL='home'
You can see that we are redirecting at home after login or log out successfully.
I hope you are enjoying my tutorial. Please add your feedback in the comment section.
Hello World, Welcome to ProjectsPlaza.com. Today I am going to discuss how to add and update data with ModelForm in Django 3. In this tutorial, We will create a simple todo application with add, update, and delete functionality. I have divided this tutorial into the following steps:
This is a small but full-fledged application built with Django 3 and bootstrap 4. You can download source code from GitHub.
Hello World, Welcome to ProjectPlaza.com. Today we will discuss how to upload image in Django. We will create a simple form to upload a single image. We will upload an image with Django core FileSystemStorage package. I have divided this tutorial into the following parts:
I have assumed that you have basic knowledge of Django. If not then please see this tutorial.
Hello World, Welcome to ProjectsPlaza.com. Today we will discuss how to create a search field in the Django admin panel. I am using Django 3. Django is a very powerful MVT (Model View Template) web Framework built with python. It comes with lots of features.
For creating a search option in the Django admin panel, We just need to activate the search features. If you have not created an admin panel in Django then please have a look at the following tutorial ?.
Hello World, Welcome to ProjectsPlaza.com. Today we will discuss how to use annotate aggregation in Django. In this tutorial, we will fetch data from two different models. For example, I am creating a video sharing website like YouTube. I have two models. One is a channel and another is a video. Both models are joined with foreign keys. Now I want to fetch channels with videos count. I will do this with annotate aggregation.
Hello World, Welcome to projects plaza.com. Today we will learn how to create a class-based view in Django 3. In this tutorial, we will render a simple template via class. Basically, there are two methods to load the view template in Django. One is a function-based view(FBV) and another is a class-based view(CBV). Class-based views were introduced in Django 1.7. The reason behind this was the proper structure, inheritance and the developer can customize the class-based view more than the function-based view.
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>CBV View</title>
</head>
<body>
<h3>Hello World, This is class based view</h3>
</body>
</html>
urlpatterns=[
...
path('cbv',TemplateView.as_view(template_name="cbv.html"))
]
Hello World, Welcome to projectsplaza.com. Today we will learn how to save form data in the database in django. We will use the SQL database. I am assuming that you have installed Django in your system, If not then please refer to this tutorial. We will create a simple contact form in which the user will fill his basic information like full name, email, and message.
I have divided this tutorial into the following parts.