coding-mentor-agent/kb/python-course-kb-practical-python/wiki/exercises/6-13-generator-expressions.md

id, source_exercise_id, title, section, source_path, source_repo, source_commit, student_visible_solution, has_private_solution, skip

id	source_exercise_id	title	section	source_path	source_repo	source_commit	student_visible_solution	has_private_solution	skip
practical-python-6.13	6.13	Generator Expressions	6.4 More Generators	06_Generators/04_More_generators.md	https://github.com/dabeaz-course/practical-python	93dca856b41c61a0a0f85ae334116e4c125629ea	false	false	false

Exercise 6.13: Generator Expressions

Source: Practical Python Programming, 06_Generators/04_More_generators.md.

Exercise 6.13: Generator Expressions

Generator expressions are a generator version of a list comprehension. For example:

>>> nums = [1, 2, 3, 4, 5]
>>> squares = (x*x for x in nums)
>>> squares
<generator object <genexpr> at 0x109207e60>
>>> for n in squares:
...     print(n)
...
1
4
9
16
25

Unlike a list a comprehension, a generator expression can only be used once. Thus, if you try another for-loop, you get nothing:

>>> for n in squares:
...     print(n)
...
>>>

关联来源

• summaries/04_More_generators