大约有 45,000 项符合查询结果(耗时:0.0814秒) [XML]

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Find the day of a week

Let's say that I have a date in R and it's formatted as follows. 7 Answers 7 ...
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How can I see the raw SQL queries Django is running?

... "Django never actually interpolates the parameters: it sends the query and the parameters separately to the database adapter, which performs the appropriate operations." From Django bug report #17741. Because of that, you should not send query output directly to a database. ...
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Difference between map and collect in Ruby?

I have Googled this and got patchy / contradictory opinions - is there actually any difference between doing a map and doing a collect on an array in Ruby/Rails? ...
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Python UTC datetime object's ISO format doesn't include Z (Zulu or Zero offset)

... Python datetime objects don't have time zone info by default, and without it, Python actually violates the ISO 8601 specification (if no time zone info is given, assumed to be local time). You can use the pytz package to get some default time zones, or directly subclass tzinfo yourself:...
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How to read a line from the console in C?

... line in a C console program The text entered might have a variable length and we can't make any assumption about its content. ...
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How do I encode and decode a base64 string?

... Null checks for input strings in both functions and the solution is perfect :) – Sverrir Sigmundarson Mar 29 '14 at 23:05 24 ...
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How to test a merge without actually merging first

... simulating a git merge between two branches, the current working branch and the master, but without making any changes? ...
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How to print out all the elements of a List in Java?

...odels = new ArrayList<>(); // TODO: First create your model and add to models ArrayList, to prevent NullPointerException for trying this example // Print the name from the list.... for(Model model : models) { System.out.println(model.getName()); } ...
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What is the purpose of Rank2Types?

...morphic. In the example map uses id as if it had type String -> String. And of course you can also pass a simple monomorphic function of the given type instead of id. Without rank2types there is no way for a function to require that its argument must be a polymorphic function and thus also no way...
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How many classes should I put in one file? [closed]

...can have one public class per file. Python doesn't have this restriction, and I'm wondering what's the best practice for organizing classes. ...