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Detecting an undefined object property
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Why use Abstract Base Classes in Python?
...ways of duck typing in Python, I fail to understand the need for ABC (abstract base classes). The help is good on how to use them.
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How can I use if/else in a dictionary comprehension?
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How do you test functions and closures for equality?
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How to understand Locality Sensitive Hashing?
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Facebook Graph API v2.0+ - /me/friends returns empty, or only friends who also use my application
... can still use the Send Dialog on Web or the new Message Dialog on iOS and Android.
UPDATE: Facebook have published an FAQ on these changes here: https://developers.facebook.com/docs/apps/faq which explain all the options available to developers in order to invite friends etc.
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How to get my IP address programmatically on iOS/macOS?
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What is “X-Content-Type-Options=nosniff”?
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What are the security risks of setting Access-Control-Allow-Origin?
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