What Are Built-in Functions?

Python has many built-in functions that help you work with data quickly without writing your own code from scratch.

Some useful ones for data analytics include:

• len() — returns the length of a list, string, or other collection
• sum() — adds all numbers in a list
• min() — finds the smallest value
• max() — finds the largest value
• round() — rounds a float to a given number of decimal places

Examples:

numbers = [4, 7, 1, 9]
print(len(numbers)) # Outputs 4
print(sum(numbers)) # Outputs 21
print(min(numbers)) # Outputs 1
print(max(numbers)) # Outputs 9
print(round(3.14159, 2)) # Outputs 3.14