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Is there a way to pass optional parameters to a function?

Is there a way in Python to pass optional parameters to a function while calling it and in the function definition have some code based on "only if the optional parameter is passed" ...
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MySQL ERROR 1045 (28000): Access denied for user 'bill'@'localhost' (using password: YES)

...ands. The recommended solution is to drop this anonymous user (this is usually a good thing to do anyways). Below edits are mostly irrelevant to the main question. These are only meant to answer some questions raised in other comments within this thread. Edit 1 Authenticating as 'bill'@'%' thr...
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Are HLists nothing more than a convoluted way of writing tuples?

I am really interested in finding out where the differences are, and more generally, to identify canonical use cases where HLists cannot be used (or rather, don't yield any benefits over regular lists). ...
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How to declare string constants in JavaScript? [duplicate]

... There's no constants in JavaScript, but to declare a literal all you have to do is: var myString = "Hello World"; I'm not sure what you mean by store them in a resource file; that's not a JavaScript concept. ...
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How to make URL/Phone-clickable UILabel?

...TextView.editable = NO; yourTextView.dataDetectorTypes = UIDataDetectorTypeAll; Swift: yourTextView.editable = false; yourTextView.dataDetectorTypes = UIDataDetectorTypes.All; This will detect links automatically. See the documentation for details. ...
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urllib2.HTTPError: HTTP Error 403: Forbidden

...Error, e: print e.fp.read() content = page.read() print content Actually, it works with just this one additional header: 'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8', share | ...
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What is the meaning and difference between subject, user and principal?

...utomation, applications, connections, etc. User - A subset of principal usually referring to a human operator. The distinction is blurring over time because the words "user" or "user ID" are commonly interchanged with "account". However, when you need to make the distinction between the broad clas...
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Iterate a list as pair (current, next) in Python

...(b, None) return itertools.izip(a, b) How this works: First, two parallel iterators, a and b are created (the tee() call), both pointing to the first element of the original iterable. The second iterator, b is moved 1 step forward (the next(b, None)) call). At this point a points to s0 and b...
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What is the most efficient way to deep clone an object in JavaScript?

... Native deep cloning It's called "structured cloning", works experimentally in Node 11 and later, and hopefully will land in browsers. See this answer for more details. Fast cloning with data loss - JSON.parse/stringify If you do not use Dates, funct...
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Preferred method to store PHP arrays (json_encode vs serialize)

...ciative array of data in a flat file for caching purposes. I might occasionally come across the need to convert it to JSON for use in my web app but the vast majority of the time I will be using the array directly in PHP. ...