{"id":1208,"date":"2020-11-18T04:24:22","date_gmt":"2020-11-18T04:24:22","guid":{"rendered":"https:\/\/www.pythontutorial.net\/?page_id=1208"},"modified":"2025-03-27T15:05:32","modified_gmt":"2025-03-27T15:05:32","slug":"python-generator-expressions","status":"publish","type":"page","link":"https:\/\/www.pythontutorial.net\/advanced-python\/python-generator-expressions\/","title":{"rendered":"Python Generator Expressions"},"content":{"rendered":"\n

Summary<\/strong>: in this tutorial, you’ll learn about the Python generator expression to create a generator object.<\/p>\n\n\n\n

Introduction to generator expressions #<\/a><\/h2>\n\n\n\n

A generator expression is an expression that returns a generator<\/a> object.<\/p>\n\n\n\n

Basically, a generator function is a function that contains a yield<\/code> statement and returns a generator object.<\/p>\n\n\n\n

For example, the following defines a generator function:<\/p>\n\n\n

def squares(length):\n    for<\/span> n in<\/span> range(length):\n        yield<\/span> n ** 2<\/span><\/code><\/span>Code language:<\/span> JavaScript<\/span> (<\/span>javascript<\/span>)<\/span><\/small><\/pre>\n\n\n
The squares<\/code> generator function returns a generator object that produces square numbers of integers from 0<\/code> to length - 1<\/code>. <\/p>\n\n\n\n
def squares(length):\n    for<\/span> n in range(length):\n        yield<\/span> n ** 2<\/span>\n\nfor<\/span> square in squares(5<\/span>):\n    print<\/span>(square)<\/code><\/span>Code language:<\/span> PHP<\/span> (<\/span>php<\/span>)<\/span><\/small><\/pre>\n\n\n
Output:<\/p>\n\n\n
0\n1\n4\n9\n16<\/code><\/span><\/pre>\n\n\n
A generator expression provides you with a more simple way to return a generator object.<\/p>\n\n\n\n
The following example defines a generator expression that returns square numbers of integers from 0 to 4:<\/p>\n\n\n
squares = (n** 2 for n in range(5))<\/code><\/span><\/pre>\n\n\n
Since the squares<\/code> is a generator object, you can iterate over its elements like this:<\/p>\n\n\n
for<\/span> square in squares:\n    print<\/span>(square)<\/code><\/span>Code language:<\/span> PHP<\/span> (<\/span>php<\/span>)<\/span><\/small><\/pre>\n\n\n
A generator expression is like a list comprehension<\/a> in terms of syntax. For example, a generator expression also supports complex syntaxes including:<\/p>\n\n\n\n
As you can see, instead of using a function<\/a> to define a generator function, you can use a generator expression.<\/p>\n\n\n\n
Try it<\/a><\/p>\n\n\n\n
Because a generator object is an iterator<\/a>, you can use a for loop<\/a> to iterate over its elements:<\/p>\n\n\n