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Is explicitly closing files important?

In Python, if you either open a file without calling close() , or close the file but not using try - finally or the " with " statement, is this a problem? Or does it suffice as a coding practice to rely on the Python garbage-collection to close all files? For example, if one does this: ...
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.NET List Concat vs AddRange

What is the difference between the AddRange and Concat functions on a generic List? Is one recommended over the other? ...
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MySQLDump one INSERT statement for each data row

with the following statement: 2 Answers 2 ...
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How to list commits since certain commit?

Is there anyway to get a list of commits from a given commit number to HEAD? 5 Answers ...
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Is Chrome's JavaScript console lazy about evaluating arrays?

I'll start with the code: 7 Answers 7 ...
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JavaScript equivalent of PHP's in_array()

Is there a way in JavaScript to compare values from one array and see if it is in another array? 20 Answers ...
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Intellij IDEA generate for-each/for keyboard shortcut

Is there a keyboard shortcut generating a foreach and also for loop? 7 Answers 7 ...
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How do I make a dotted/dashed line in Android?

I'm trying to make a dotted line. I'm using this right now for a solid line: 19 Answers ...
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Python argparse command line flags without arguments

How do I add an optional flag to my command line args? 4 Answers 4 ...
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How can I use if/else in a dictionary comprehension?

Does there exist a way in Python 2.7+ to make something like the following? 4 Answers ...