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Mastering the Art of Programming in Python 3

Generator Expressions

Iterating with generator expressions.

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Generators can be easily created on the fly by using generator expressions.

Generator expression versus list comprehension

The syntax of a generator expression is similar to that of a list comprehension with just one difference: the square brackets are replaced by round parentheses. For example:

Python 3.10.4
orig = [1, 2, 3]
listcomp = [n+1 for n in orig]  # Designing list comprehennsion out of list
generator = (n+1 for n in orig) # Designing generator exp. out of list
print(listcomp)
print(generator)

We can see that a generator expression doesn’t produce the output directly. It returns a generator object which will produce the items when explicitly told. Whereas, on printing listcomp, we immediately ...