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What is the purpose of Looper and how to use it?

I am new to Android. I want to know what the Looper class does and also how to use it. I have read the Android Looper class documentation but I am unable to completely understand it. I have seen it in a lot of places but unable to understand its purpose. Can anyone help me by defining the purpos...
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Find the most frequent number in a numpy vector

Suppose I have the following list in python: 12 Answers 12 ...
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Why is it string.join(list) instead of list.join(string)?

This has always confused me. It seems like this would be nicer: 10 Answers 10 ...
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How to count the number of occurrences of an element in a List

I have an ArrayList , a Collection class of Java, as follows: 22 Answers 22 ...
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Why does printf not flush after the call unless a newline is in the format string?

Why does printf not flush after the call unless a newline is in the format string? Is this POSIX behavior? How might I have printf immediately flush every time? ...
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Add list to set?

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What is the facade design pattern?

Is facade a class which contains a lot of other classes? 20 Answers 20 ...
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How to overcome root domain CNAME restrictions?

We are hosting many web applications for our customers. As is obvious they want to use their own domains to refer to those applications, usually they want that any user that either type http://www.customer1.example or http://customer1.example goes to their web application. ...
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Joda-Time: what's the difference between Period, Interval and Duration?

In Joda-Time 2, what is the difference between the three kinds of time spans: 2 Answers ...
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Is it ok to use dashes in Python files when trying to import them?

Basically when I have a python file like: 7 Answers 7 ...