Various Built In Functions

Python ships with a rich set of built-in functions that are always available, without needing any import. Knowing these well saves you from writing custom code for common, everyday tasks.

Commonly Used Built-In Functions

• len() - returns the number of items in a list, string, or other collection
• range() - generates a sequence of numbers, most often used in loops
• map() - applies a function to every item in an iterable
• filter() - keeps only the items in an iterable that satisfy a condition
• zip() - combines multiple iterables together, element by element
• sorted() - returns a new sorted list from any iterable
• enumerate() - loops through an iterable while also tracking the index

names = ["Aman", "Priya", "Rohit"]
scores = [78, 92, 85]

for index, name in enumerate(names):
    print(index, name)

for name, score in zip(names, scores):
    print(name, "scored", score)

print(sorted(scores))          # [78, 85, 92]
print(sorted(scores, reverse=True))   # [92, 85, 78]

Coming Up Next

With Python's functional toolkit covered, the course now shifts into Object Oriented Programming, starting with an introduction to its core concepts.