Py Generators — Free Python Tutorial
Learn Py Generators in Python with a free, beginner-friendly tutorial, examples and practice for Indian students on Syllab.in.
TL;DR: Learn Py Generators in Python with a free, beginner-friendly tutorial, examples and practice for Indian students on Syllab.in.
Written & reviewed by the Syllab.in Academic Team (CBSE/NCERT subject experts) · Updated
Py Generators in Python
A generator is a function that returns values one at a time using the yield keyword, instead of returning all values at once. This saves memory when working with large data.
Regular functions use return — they compute everything and hand it all back. Generators yield — they pause, give one value, and resume when you ask for the next.
Python's for loop and next() function work naturally with generators. The iterator protocol requires __iter__() and __next__() methods.
Common use: reading huge files line by line, generating infinite sequences, or building data pipelines without loading everything into memory.
Py Generators — Syntax
def my_generator():
yield value1
yield value2
...
# Using a generator
for item in my_generator():
print(item)
# Generator expression (like list comprehension but lazy)
gen = (x**2 for x in range(10))
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