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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Issue with Variable Scope in Python within Generator Expressions","articleBody":"I am facing an issue in Python where variables within generator expressions (such as `all(...)` or list comprehensions) are not accessible unless declared globally. For instance, in `all(row[column] == fieldData for row in eventsList)`, both `column` and `eventsList` are not accessible in that context, resulting in the `exception: name 'eventsList' is not defined`. Does anyone know how to solve this without declaring the variables globally?\r\n\r\nThis won't work:\r\n```python\r\ncolumn = 'some_column'\r\nfieldData = 'expected_value'\r\neventsList = [{'some_column': 'expected_value'}, {'some_column': 'other_value'}]\r\n\r\nif all(row[column] == fieldData for row in eventsList):\r\n    print(\"All rows match\")\r\nelse:\r\n    print(\"Not all rows match\")\r\n```\r\n    \r\nbut will do if I append `global column, fieldData, eventsList` at the beggining","author":{"url":"https://github.com/melv33n","@type":"Person","name":"melv33n"},"datePublished":"2024-12-09T11:20:46.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":3},"url":"https://github.com/388/python-apps/issues/388"}