René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"`netrc` emits syntax errors for comments after blank lines","articleBody":"# Bug report\r\n\r\n`netrc.netrc()` emits a syntax error if it encounters a comment after a blank line. Prior to the 3.11, it only did this if the comment was the first non-whitespace thing in the file, but now with 3.11 it does it for all comments.\r\n\r\nFor example:\r\n\r\n```python\r\nimport netrc\r\n\r\nfilename = 'netrctest'\r\n\r\nwith open(filename, 'w') as fl:\r\n    print(\"\"\"\r\n# HTTP\r\nmachine www.example.com login myuser password mypass\r\n\r\n# FTP\r\nmachine ftp.example.com login myuser password mypass\r\n\"\"\", file=fl)\r\n\r\nprint(netrc.netrc(filename))\r\n```\r\nproduces\r\n```console\r\n$ python netrc-test.py \r\nTraceback (most recent call last):\r\n  File \"/home/lukeshu/netrc-test.py\", line 14, in \u003cmodule\u003e\r\n    print(netrc.netrc(filename))\r\n          ^^^^^^^^^^^^^^^^^^^^^\r\n  File \"/usr/lib/python3.11/netrc.py\", line 31, in __init__\r\n    self._parse(file, fp, default_netrc)\r\n  File \"/usr/lib/python3.11/netrc.py\", line 66, in _parse\r\n    raise NetrcParseError(\r\nnetrc.NetrcParseError: bad toplevel token 'HTTP' (netrctest, line 3)\r\n```\r\n\r\nThis issue was made worse by https://github.com/python/cpython/pull/26330.  Prior to that change (prior to 3.11), it only triggered on the if the comment was the first thing in the file.  For example, if we remove the leading newline:\r\n\r\n```python\r\nimport netrc\r\n\r\nfilename = 'netrctest'\r\n\r\nwith open(filename, 'w') as fl:\r\n    print(\"\"\"# HTTP\r\nmachine www.example.com login myuser password mypass\r\n\r\n# FTP\r\nmachine ftp.example.com login myuser password mypass\r\n\"\"\", file=fl)\r\n\r\nprint(netrc.netrc(filename))\r\n```\r\nBefore we got:\r\n```console\r\n$ python netrc-test.py \r\nmachine www.example.com\r\n        login myuser\r\n        password mypass\r\nmachine ftp.example.com\r\n        login myuser\r\n        password mypass\r\n\r\n```\r\nbut now in 3.11 we get:\r\n```console\r\n$ python netrc-test.py \r\nTraceback (most recent call last):\r\n  File \"/home/lukeshu/netrc-test.py\", line 13, in \u003cmodule\u003e\r\n    print(netrc.netrc(filename))\r\n          ^^^^^^^^^^^^^^^^^^^^^\r\n  File \"/usr/lib/python3.11/netrc.py\", line 75, in __init__\r\n    self._parse(file, fp, default_netrc)\r\n  File \"/usr/lib/python3.11/netrc.py\", line 140, in _parse\r\n    raise NetrcParseError(\"bad follower token %r\" % tt,\r\nnetrc.NetrcParseError: bad follower token 'FTP' (netrctest, line 4)\r\n```\r\n\r\n# Your environment\r\n\r\n- CPython versions tested on: 3.11.3\r\n- Operating system and architecture: Parabola GNU/Linux-libre (like Arch Linux) on x86_64.\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-104511\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/LukeShu","@type":"Person","name":"LukeShu"},"datePublished":"2023-05-08T20:06:05.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":1},"url":"https://github.com/104306/cpython/issues/104306"}