Programming II - Python Basics

What is the difference between a list and a NumPy array?

• NumPy arrays are slower and use more memory than lists.

• NumPy arrays are faster, use less memory, and support mathematical operations directly.

• Lists can only store one data type, while NumPy arrays can store multiple types.

• NumPy arrays are only used for 1-dimensional data, while lists can be multi-dimensional.

What does the 'map()' function do?

• It applies a function to all items in an iterable.

• It creates a new list from an existing list.

• It filters items from an iterable based on a condition.

• It sorts the items in an iterable.

What are the two main platforms to write Python code?

• Jupyter Notebook and Google Colab

• Visual Studio Code and PyCharm

• Eclipse and NetBeans

• Atom and Sublime Text

What does the 'not' operator do?

• It flips True to False and vice versa.

• It converts a string to an integer.

• It checks if a value is null.

• It returns the absolute value of a number.

How do you define a function in Python?

• Use the syntax: def function_name(parameters):

• Use the syntax: function_name(parameters) = def

• Define a function by writing function_name(parameters) in the main body

• Use the syntax: define function_name(parameters) as:

What is the purpose of the pandas library?

• Data visualization and reporting.

• Data manipulation and analysis.

• Machine learning model training.

• Web development and design.

What is the purpose of the 'filter()' function?

• It constructs an iterator from elements of an iterable for which a function returns true.

• It sorts the elements of an iterable in ascending order.

• It maps a function to all elements of an iterable.

• It reduces an iterable to a single cumulative value.

What is scientific notation in Python?

• A way to represent very small or large numbers, e.g., x = 25e-3 means 25 × 10⁻³.

• A method to convert strings to integers in Python.

• A technique for creating complex data structures in Python.

• A way to format dates and times in Python.

What is a DataFrame in pandas?

• A 2-dimensional labeled data structure with columns of potentially different types.

• A 1-dimensional array of data.

• A type of database used for storing large datasets.

• A graphical representation of data in charts and graphs.

What is the output of 'print(3 * 2 == 7)'?

• True

• False

• None

• Error