{"id":9259,"date":"2022-09-18T01:49:58","date_gmt":"2022-09-17T20:19:58","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-python-mapping-that-stays-sorted-by-value\/"},"modified":"2022-09-18T01:49:58","modified_gmt":"2022-09-17T20:19:58","slug":"solved-python-mapping-that-stays-sorted-by-value","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-python-mapping-that-stays-sorted-by-value\/","title":{"rendered":"[Solved] python mapping that stays sorted by value"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<div id=\"answer-59078213\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"59078213\" data-parentid=\"58998537\" data-score=\"0\" data-position-on-page=\"1\" data-highest-scored=\"1\" data-question-has-accepted-highest-score=\"1\" itemprop=\"acceptedAnswer\" itemscope itemtype=\"https:\/\/schema.org\/Answer\">\n<div class=\"post-layout\">\n<div class=\"votecell post-layout--left\"><\/div>\n<div class=\"answercell post-layout--right\">\n<div class=\"s-prose js-post-body\" itemprop=\"text\">\n<p>The following class is a quick and dirty implementation with no guarantees for efficiency but it provides the desired behavior.<br \/>\nShould someone provide a better answer, I will gladly accept it!<\/p>\n<pre class=\"lang-py prettyprint-override\"><code>class SortedValuesDict:\n    def __init__(self, args=None, **kwargs):\n        \"\"\"Initialize the SortedValuesDict with an Iterable or Mapping.\"\"\"\n        from collections import Mapping\n        from sortedcontainers import SortedSet\n        self.__sorted_values = SortedSet()\n        self.__key_value_pairs = {}\n        self.__value_key_pairs = {}\n        if args is not None:\n            iterable = args.items() if isinstance(args, Mapping) else args\n            for key, value in iterable:\n                self.__setitem__(key, value)\n        for key, value in kwargs.items():\n            self.__setitem__(key, value)\n\n    def __repr__(self):\n        \"\"\"Get a representation of the SortedValuesDict.\"\"\"\n        return f\"SortedValuesDict({', '.join(f'{k}: {v}' for k, v in self)})\"\n\n    def __setitem__(self, key, value):\n        \"\"\"Store the key, value pair in the SortedValuesDict.\"\"\"\n        if key in self:\n            del self[key]\n        self.__key_value_pairs[key] = value\n        self.__sorted_values.add(value)\n        if value in self.__value_key_pairs:\n            self.__value_key_pairs[value].add(key)\n        else:\n            self.__value_key_pairs[value] = {key}\n\n    def __getitem__(self, key):\n        \"\"\"Get the value corresponding to the key.\"\"\"\n        return self.__key_value_pairs[key]\n\n    def __delitem__(self, key):\n        \"\"\"Remove the given key from the SortedValuesDict\"\"\"\n        value = self.__key_value_pairs.pop(key)\n        keys = self.__value_key_pairs[value]\n        keys.remove(key)\n        if not keys:\n            del self.__value_key_pairs[value]\n            self.__sorted_values.remove(value)\n\n    def __contains__(self, key):\n        \"\"\"Test if key is in SortedValuesDict.\"\"\"\n        return key in self.__key_value_pairs\n\n    def __iter__(self):\n        \"\"\"Iterate over the SortedValuesDict items.\"\"\"\n        for value in self.__sorted_values:\n            for key in self.__value_key_pairs[value]:\n                yield key, value\n\n    def keys(self):\n        \"\"\"Iterate over the SortedValuesDict keys.\"\"\"\n        for value in self.__sorted_values:\n            for key in self.__value_key_pairs[value]:\n                yield key\n\n    def values(self):\n        \"\"\"Iterate over the SortedValuesDict values.\"\"\"\n        for value in self.__sorted_values:\n            for key in self.__value_key_pairs[value]:\n                yield value\n\n    def items(self):\n        \"\"\"Iterate over the SortedValuesDict items.\"\"\"\n        yield from self\n\n    def peek(self, pos=0):\n        \"\"\"Peek at the next key for the value at position pos.\"\"\"\n        return next(iter(self.__value_key_pairs[self.__sorted_values[pos]]))\n\n    def peekvalue(self, pos=0):\n        \"\"\"Peek at the value at position pos (default 0).\"\"\"\n        return self.__sorted_values[pos]\n\n    def peekitem(self, pos=0):\n        \"\"\"Peek at the the next key for the value at position pos.\"\"\"\n        value = self.__sorted_values[pos]\n        return next(iter(self.__value_key_pairs[value])), value\n\n    def pop(self, pos=-1):\n        \"\"\"Pop a key corresponding to the value at position pos.\"\"\"\n        value = self.__sorted_values[pos]\n        keys = self.__value_key_pairs[value]\n        key = keys.pop()\n        del self.__key_value_pairs[key]\n        if not keys:\n            del self.__value_key_pairs[self.__sorted_values.pop(pos)]\n        return key\n\n    def popitem(self, pos=-1):\n        \"\"\"Pop an item corresponding to the value at position pos.\"\"\"\n        value = self.__sorted_values[pos]\n        keys = self.__value_key_pairs[value]\n        key = keys.pop()\n        del self.__key_value_pairs[key]\n        if not keys:\n            del self.__value_key_pairs[self.__sorted_values.pop(pos)]\n        return key, value\n<\/code><\/pre>\n<pre class=\"lang-py prettyprint-override\"><code>m = SortedValuesDict(a=3, b=1, c=2)\n[*m.values()]  # [1, 2, 3]\n[*m]  # [('b', 1), ('c', 2), ('a', 3)] (same as [*m.items()])\nm.peekitem(0)  # ('b', 1)\nm.peekitem(-1)  # ('a', 3)\nm['d'] = 0\nm.peekitem(0)  # ('d', 0)\nm.peekitem(-1)  # ('a', 3)\nm['e'] = 0\nm  # SortedValuesDict(d: 0, e: 0, b: 1, c: 2, a: 3)\nm.peekitem(0)  # (('d', 0), ('e', 0))\nm.pop()  # 'a' (from back)\nm.pop(0)  # 'd'\nm  # SortedValuesDict(e: 0, b: 1, c: 2)\nm.popitem()  # ('c', 2)\n<\/code><\/pre>\n<\/p><\/div>\n<div class=\"mt24\"><\/div>\n<\/div>\n<p>            <span class=\"d-none\" itemprop=\"commentCount\"><\/span> <\/p><\/div>\n<\/div>\n<p>[ad_2]<\/p>\n<p>solved python mapping that stays sorted by value <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] The following class is a quick and dirty implementation with no guarantees for efficiency but it provides the desired behavior. Should someone provide a better answer, I will gladly accept it! class SortedValuesDict: def __init__(self, args=None, **kwargs): &#8220;&#8221;&#8221;Initialize the SortedValuesDict with an Iterable or Mapping.&#8221;&#8221;&#8221; from collections import Mapping from sortedcontainers import SortedSet self.__sorted_values &#8230; <a title=\"[Solved] python mapping that stays sorted by value\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-python-mapping-that-stays-sorted-by-value\/\" aria-label=\"More on [Solved] python mapping that stays sorted by value\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[859,349,561],"class_list":["post-9259","post","type-post","status-publish","format-standard","hentry","category-solved","tag-data-structures","tag-python","tag-sorting"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>[Solved] python mapping that stays sorted by value - JassWeb<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/jassweb.com\/solved\/solved-python-mapping-that-stays-sorted-by-value\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] python mapping that stays sorted by value - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] The following class is a quick and dirty implementation with no guarantees for efficiency but it provides the desired behavior. Should someone provide a better answer, I will gladly accept it! class SortedValuesDict: def __init__(self, args=None, **kwargs): &quot;&quot;&quot;Initialize the SortedValuesDict with an Iterable or Mapping.&quot;&quot;&quot; from collections import Mapping from sortedcontainers import SortedSet self.__sorted_values ... 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Should someone provide a better answer, I will gladly accept it! class SortedValuesDict: def __init__(self, args=None, **kwargs): \"\"\"Initialize the SortedValuesDict with an Iterable or Mapping.\"\"\" from collections import Mapping from sortedcontainers import SortedSet self.__sorted_values ... 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