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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Accessing a tkinter object's string representation converts the object to a string on Windows","articleBody":"Introduced in #16545\r\nAffects Python 3.7+ on Windows only\r\n\r\n---\r\n\r\nThe [`FromObj`](https://github.com/python/cpython/blob/3eb12df8b526aa5a2ca6b43f21a1c5e7d38ee634/Modules/_tkinter.c#L1115) function in `_tkinter.c` attempt to convert a `Tcl_Obj` to an equivalent Python object if possible, and otherwise returns a `_tkinter.Tcl_Obj` with the `typename` attribute set to the original object's type.\r\n\r\nHowever, on Windows, accessing the resulting object's string representation [calls `Tcl_GetUnicodeFromObj`](https://github.com/python/cpython/blob/3eb12df8b526aa5a2ca6b43f21a1c5e7d38ee634/Modules/_tkinter.c#L492), which converts the `Tcl_Obj` to a `String`. This side effect isn't mentioned in the Tcl documentation, but is [in the Tcl source code](https://github.com/tcltk/tcl/blob/c529405c659f132d217336a626895a13a0ecaef0/generic/tclStringObj.c#L655-L672). As a result, retrieving the same tk property afterwards will return a Python string instead.\r\n\r\nMinimal example:\r\n```py\r\nimport tkinter as tk\r\n\r\nroot = tk.Tk()\r\nprint(type(root.cget(\"padx\")))\r\n_ = str(root.cget(\"padx\"))  # should really not cause any side effects\r\nprint(type(root.cget(\"padx\")))\r\n\r\n# Windows:\r\n# \u003cclass '_tkinter.Tcl_Obj'\u003e\r\n# \u003cclass 'str'\u003e\r\n# Other platforms:\r\n# \u003cclass '_tkinter.Tcl_Obj'\u003e\r\n# \u003cclass '_tkinter.Tcl_Obj'\u003e\r\n```\r\n\r\n---\r\n\r\nPossible solutions: `unicodeFromTclObj` should copy the object before passing calling `Tcl_GetUnicodeFromObj`, or handle Unicode without it like on other platforms.\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-120884\n* gh-120905\n* gh-120913\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/daniilS","@type":"Person","name":"daniilS"},"datePublished":"2023-02-11T19:57:21.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":2},"url":"https://github.com/101830/cpython/issues/101830"}