Book Image

Web App Development Made Simple with Streamlit

By : Rosario Moscato
Book Image

Web App Development Made Simple with Streamlit

By: Rosario Moscato

Overview of this book

This book is a comprehensive guide to the Streamlit open-source Python library and simplifying the process of creating web applications. Through hands-on guidance and realistic examples, you’ll progress from crafting simple to sophisticated web applications from scratch. This book covers everything from understanding Streamlit's central principles, modules, basic features, and widgets to advanced skills such as dealing with databases, hashes, sessions, and multipages. Starting with fundamental concepts like operation systems virtualization, IDEs, development environments, widgets, scripting, and the anatomy of web apps, the initial chapters set the groundwork. You’ll then apply this knowledge to develop some real web apps, gradually advancing to more complex apps, incorporating features like natural language processing (NLP), computer vision, dashboards with interactive charts, file uploading, and much more. The book concludes by delving into the implementation of advanced skills and deployment techniques. By the end of this book, you’ll have transformed into a proficient developer, equipped with advanced skills for handling databases, implementing secure login processes, managing session states, creating multipage applications, and seamlessly deploying them on the cloud.
Table of Contents (23 chapters)
Free Chapter
1
Part 1: Getting Started with Streamlit
5
Part 2: Building a Basic Web App for Essential Streamlit Skills
10
Part 3: Developing Advanced Skills with a Covid-19 Detection Tool
15
Part 4: Advanced Techniques for Secure and Customizable Web Applications

Date, time, and more

Another very useful element that we can manage out of the box in Streamlit is date and time – that is, dates, hours, and so on.

For example, to print today’s date on the screen, we just have to write the following:

import datetime
today = st.date_input("Today is",datetime.datetime.now())

Here, the first line simply imports the datetime package while the second, using Streamlit’s date_input, asks the user to select a date. This date will be saved in the today variable:

Figure 3.34: The st.date_input widget

Figure 3.34: The st.date_input widget

Continuing with date and time, we can do the same with time, as follows:

import time
hour = st.time_input("The time is",datetime.time(12,30))

This time, we are importing time and using time_input, where we specify that the time is 12:30. On the screen, we can select any time we want:

Figure 3.35: The st.time_input widget

Figure 3.35: The st.time_input widget

Streamlit is powerful and easy...