Mastering Data Entry and Visualization

What is Streamlit used for in Python?

• Streamlit is used for creating interactive web applications in Python.

• Streamlit is used for creating desktop applications in Python.

• Streamlit is a library for machine learning model training.

• Streamlit is used for data analysis in Python.

Answer explanation

Streamlit is specifically designed for creating interactive web applications in Python, allowing users to build and share data-driven apps easily. The other options do not accurately describe its primary function.

How can you create a text input box in Streamlit?

• st.write_input('Input your text')

• st.text_input('Enter your text here')

• st.input_text('Your text here')

• st.textbox('Type something')

Answer explanation

The correct way to create a text input box in Streamlit is using st.text_input('Enter your text here'). This function specifically allows users to input text, while the other options are incorrect or do not exist.

What function is used to display a histogram in Python?

• plt.plot()

• plt.bar()

• plt.hist()

• plt.scatter()

Answer explanation

The function plt.hist() is specifically designed to create histograms in Python using Matplotlib. Other functions like plt.plot() and plt.bar() serve different purposes, making plt.hist() the correct choice for displaying histograms.

Which library is commonly used for creating pie charts in Python?

• Seaborn

• Matplotlib

• NumPy

• Pandas

Answer explanation

Matplotlib is the most commonly used library for creating pie charts in Python due to its extensive capabilities for data visualization, including pie chart functionality. Seaborn and Pandas are built on top of Matplotlib, while NumPy is primarily for numerical operations.

What is the purpose of the st.write() function in Streamlit?

• To create interactive widgets in a Streamlit app.

• To manage user authentication in a Streamlit app.

• To handle database connections in a Streamlit app.

• To display text, data, and other content in a Streamlit app.

Answer explanation

The st.write() function in Streamlit is used to display text, data, and other content in a Streamlit app, making it essential for presenting information to users.

How do you calculate the average of a list of numbers in Python?

• average = sum(numbers) / len(numbers)

• average = sum(numbers) * len(numbers)

• average = len(numbers) / sum(numbers)

• average = max(numbers) - min(numbers)

Answer explanation

To calculate the average of a list of numbers in Python, you use the formula: average = sum(numbers) / len(numbers). This correctly divides the total sum of the numbers by the count of numbers, yielding the average.

What command is used to run a Streamlit app?

• start streamlit app

• run streamlit

• streamlit start

• streamlit run

Answer explanation

The correct command to run a Streamlit app is 'streamlit run'. This command initializes the Streamlit server and launches the specified app, making it the standard way to start a Streamlit application.

How can you customize the appearance of a histogram in Python?

• Use NumPy to create a histogram without customization.

• Use only default settings without any modifications.

• Apply CSS styles directly to the histogram.

• Use Matplotlib or Seaborn to customize color, labels, bins, axis limits, and titles.

Answer explanation

To customize a histogram in Python, use libraries like Matplotlib or Seaborn. They allow you to modify colors, labels, bins, axis limits, and titles, enhancing the visual representation of your data.

What is the function to create a pie chart in Matplotlib?

• plt.pie()

• plt.chart()

• plt.diagram()

• plt.graph()

Answer explanation

The correct function to create a pie chart in Matplotlib is plt.pie(). The other options, plt.chart(), plt.diagram(), and plt.graph(), do not exist in the Matplotlib library.

How do you import Streamlit in a Python script?

• import streamlit

• import streamlit as st

• from streamlit import st

• require streamlit as st

Answer explanation

The correct way to import Streamlit in a Python script is 'import streamlit as st'. This allows you to use 'st' as a shorthand for accessing Streamlit functions, making your code cleaner and more concise.