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Title: How to maintain keys in TransformDict? · Issue #21 · fluentpython/example-code · GitHub

Open Graph Title: How to maintain keys in TransformDict? · Issue #21 · fluentpython/example-code

X Title: How to maintain keys in TransformDict? · Issue #21 · fluentpython/example-code

Description: I see the demo: ''' >>> d = TransformDict(str.lower) >>> d['Foo'] = 5 >>> d['foo'] == d['FOO'] == d['Foo'] == 5 True >>> set(d.keys()) {'Foo'} ''' but , i dont know the object how to maintain the keys. thanks

Open Graph Description: I see the demo: ''' >>> d = TransformDict(str.lower) >>> d['Foo'] = 5 >>> d['foo'] == d['FOO'] == d['Foo'] == 5 True >>> set(d.keys()) {'Foo'} ''' but , i dont know the object how to maintain the k...

X Description: I see the demo: ''' >>> d = TransformDict(str.lower) >>> d['Foo'] = 5 >>> d['foo'] == d['FOO'] == d['Foo'] == 5 True >>&...

Opengraph URL: https://github.com/fluentpython/example-code/issues/21

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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":" How to maintain keys in TransformDict?","articleBody":"I see the demo:\r\n'''\r\n    \u003e\u003e\u003e d = TransformDict(str.lower)\r\n    \u003e\u003e\u003e d['Foo'] = 5\r\n    \u003e\u003e\u003e d['foo'] == d['FOO'] == d['Foo'] == 5\r\n    True\r\n    \u003e\u003e\u003e set(d.keys())\r\n    {'Foo'}\r\n'''\r\nbut , i dont know the object how to maintain the keys.\r\nthanks\r\n","author":{"url":"https://github.com/oldman1991","@type":"Person","name":"oldman1991"},"datePublished":"2018-06-11T03:10:41.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/21/example-code/issues/21"}

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