Built-in Functions

Built-in functions in Python are predefined functions that are readily available for use in any Python program without requiring additional specifications or definitions. One of these built-in functions is the print() function, which we have already used. We didn't need to define this function, write its body, or specify the return value; we simply called it and provided inputs. There are many built-in functions in Python. Let's consider some of the most commonly used ones:

print(): Outputs a specified message or variable to the console.

print("My message")


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print("My message")

len(): Returns the number of elements in an object, such as a string, list, or tuple.

word = "Codefinity"

print("Word length:", len(word))


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word = "Codefinity"
print("Word length:", len(word))

sum(): Computes the total of a sequence of numbers.

numbers = [5, 2, 3]

print("Sum of numbers:", sum(numbers))


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numbers = [5, 2, 3]
print("Sum of numbers:", sum(numbers))

max() and min(): Return the maximum or minimum value from a sequence.

numbers = [5, 2, 3]

print("The largest among the numbers:", max(numbers))

print("The smallest of the numbers:", min(numbers))


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numbers = [5, 2, 3]
print("The largest among the numbers:", max(numbers))
print("The smallest of the numbers:", min(numbers))

You might already be familiar with these functions, or perhaps not. The key in this chapter is to understand the difference between built-in functions and those you create yourself.

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