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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Python language server didn't work properly when editing '__init__.py'","articleBody":"@CamberLoid commented on [Wed Jan 30 2019](https://github.com/Microsoft/vscode-python/issues/4226)\n\nIssue Type: \u003cb\u003eBug\u003c/b\u003e\r\n\r\nPython language server raised an exception and caused problems when handling this `import (modules),(),`  \r\nAfter double-checking on my Windows, I am sure this is because of the extra comma in the import expression in `__init__.py` , \r\n\r\nUsing Anaconda distribution. Have not tried to reproduce on other OS.\r\n\r\nEnvironment data\r\n---\r\n- Version: 1.30.2 (user setup)  \r\n- Commit: 61122f88f0bf01e2ac16bdb9e1bc4571755f5bd8  \r\n- Date: 2019-01-07T22:54:13.295Z   \r\n- Electron: 2.0.12  \r\n- Chrome: 61.0.3163.100  \r\n- Node.js: 8.9.3  \r\n- V8: 6.1.534.41  \r\n- OS: Windows_NT x64 10.0.18323\r\n\r\nActual behaviour\r\n---\r\nCannot access origin libraries by Ctrl+(Modules), and the exceptions below.   \r\nIt acts like this  \r\n\r\n![issue](https://user-images.githubusercontent.com/22998116/52004555-55228a00-2502-11e9-9af6-f73077e4b727.gif)\r\n\r\n\r\nExpected behaviour\r\n---\r\nAccess origin libraries by Ctrl+(Modules)  \r\nand no Exceptions\r\n\r\nLogs\r\n---\r\n```\r\n[Error - 1:18:14 AM] System.ArgumentOutOfRangeException: Index was out of range. Must be non-negative and less than the size of the collection.\r\nParameter name: index\r\n   at System.SZArrayHelper.get_Item[T](Int32 index)\r\n   at Microsoft.PythonTools.Analysis.Analyzer.DDG.ImportModule(ImportStatement\u0026 node, IModule\u0026 module, DottedName\u0026 moduleImportExpression, NameExpression\u0026 asNameExpression)\r\n   at Microsoft.PythonTools.Analysis.Analyzer.DDG.Walk(ImportStatement node)\r\n   at Microsoft.PythonTools.Parsing.Ast.ImportStatement.Walk(PythonWalker walker)\r\n   at Microsoft.PythonTools.Analysis.Analyzer.DDG.Walk(SuiteStatement node)\r\n   at Microsoft.PythonTools.Parsing.Ast.SuiteStatement.Walk(PythonWalker walker)\r\n   at Microsoft.PythonTools.Parsing.Ast.PythonAst.Walk(PythonWalker walker)\r\n   at Microsoft.PythonTools.Analysis.AnalysisUnit.AnalyzeWorker(DDG ddg, CancellationToken cancel)\r\n   at Microsoft.PythonTools.Analysis.Analyzer.DDG.Analyze(Deque`1 queue, CancellationToken cancel, Action`1 reportQueueSize, Int32 reportQueueInterval)\r\n   at Microsoft.PythonTools.Analysis.PythonAnalyzer.AnalyzeQueuedEntries(CancellationToken cancel)\r\n   at Microsoft.PythonTools.Intellisense.AnalysisQueue.GroupAnalysis.Analyze(CancellationToken cancel)\r\n   at Microsoft.PythonTools.Intellisense.AnalysisQueue.HandleAnalyzable(IAnalyzable item, AnalysisPriority priority, CancellationToken cancellationToken)\r\n   at Microsoft.PythonTools.Intellisense.AnalysisQueue.ConsumerLoop()\r\n```\r\n\r\n\r\nExtension version: 2019.1.0\r\nVS Code version: Code 1.30.2 (61122f88f0bf01e2ac16bdb9e1bc4571755f5bd8, 2019-01-07T22:54:13.295Z)\r\nOS version: Windows_NT x64 10.0.18323\r\n\r\n\u003cdetails\u003e\r\n\u003csummary\u003eSystem Info\u003c/summary\u003e\r\n\r\n|Item|Value|\r\n|---|---|\r\n|CPUs|Intel(R) Core(TM) i7-8750H CPU @ 2.20GHz (12 x 2208)|\r\n|GPU Status|2d_canvas: enabled\u003cbr\u003echecker_imaging: disabled_off\u003cbr\u003eflash_3d: enabled\u003cbr\u003eflash_stage3d: enabled\u003cbr\u003eflash_stage3d_baseline: enabled\u003cbr\u003egpu_compositing: enabled\u003cbr\u003emultiple_raster_threads: enabled_on\u003cbr\u003enative_gpu_memory_buffers: disabled_software\u003cbr\u003erasterization: enabled\u003cbr\u003evideo_decode: enabled\u003cbr\u003evideo_encode: enabled\u003cbr\u003ewebgl: enabled\u003cbr\u003ewebgl2: enabled|\r\n|Memory (System)|15.87GB (9.36GB free)|\r\n|Process Argv||\r\n|Screen Reader|no|\r\n|VM|0%|\r\n\r\n\u003c/details\u003e\r\n\u003c!-- generated by issue reporter --\u003e\n\n---\n\n@d3r3kk commented on [Thu Jan 31 2019](https://github.com/Microsoft/vscode-python/issues/4226#issuecomment-459536232)\n\nVerified, here's another gif that might help figure out the issue:\r\n\r\n![4226_intellisense_exception_on_import_trailing_comma](https://user-images.githubusercontent.com/11466735/52090633-d01d8c00-2566-11e9-8ed7-dfb53e45fde6.gif)\r\n\r\nThis is using `Microsoft Python Language Server version 0.1.78.0`, Miniconda3 on Windows with Python 3.7.2\r\n\n\n","author":{"url":"https://github.com/d3r3kk","@type":"Person","name":"d3r3kk"},"datePublished":"2019-01-31T22:47:43.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":5},"url":"https://github.com/572/python-language-server/issues/572"}