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What is the purpose of the word 'self'?

...way that makes the instance to which the method belongs be passed automatically, but not received automatically: the first parameter of methods is the instance the method is called on. That makes methods entirely the same as functions, and leaves the actual name to use up to you (although self is th...
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What are the differences between json and simplejson Python modules?

...ossible. A good practice, in my opinion, is to use one or the other as a fallback. try: import simplejson as json except ImportError: import json share | improve this answer | ...
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How do cache lines work?

...,5% of its time (if it only reads memory) idle waiting for the memory. In order to speed things up there is the L1, L2, L3 caches. They use memory being directly placed on the chip and using a different kind of transistor circuits to store the given bits. This takes more room, more energy and is mo...
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Ignore .pyc files in git repository

...t to to do it beforehand, if you just add the line to the .gitignore file, all previously committed .pyc files will still be tracked, so you'll need to remove them from the repository. If you are on a Linux system (or "parents&sons" like a MacOSX), you can quickly do it with just this one line ...
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When do you use map vs flatMap in RxJava?

...t his id when user login in. Obviously I need two requests and they are in order. Let's begin. Observable<LoginResponse> login(String email, String password); Observable<UserInfo> fetchUserInfo(String userId); Here are two methods, one for login returned Response, and another for ...
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How to get line count of a large file cheaply in Python?

... You can't get any better than that. After all, any solution will have to read the entire file, figure out how many \n you have, and return that result. Do you have a better way of doing that without reading the entire file? Not sure... The best solution will always ...
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How do I change the string representation of a Python class? [duplicate]

... functions. Json dumps treats the object as a dictionary, and will convert all keys to strs. – mchicago Mar 7 '14 at 12:14 add a comment  |  ...
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How do I create some kind of table of content in GitHub wiki?

...nk is <project URL#<header name>. The <header name> must be all lower case. share | improve this answer | follow | ...
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How do I check if the Java JDK is installed on Mac?

How do you check if Java SDK is installed on a Mac? 8 Answers 8 ...
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How can I find script's directory with Python? [duplicate]

... You need to call os.path.realpath on __file__, so that when __file__ is a filename without the path you still get the dir path: import os print(os.path.dirname(os.path.realpath(__file__))) ...