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Generator Expressions vs. List Comprehension
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John's answer is good (that list comprehensions are better when you want to iterate over something multiple times). However, it's also worth noting that you should use a list if you want to use any of the list methods. For example, the following code won't work:
def gen():
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Git checkout: updating paths is incompatible with switching branches
My problem is related to Fatal Git error when switching branch .
11 Answers
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Replace multiple whitespaces with single whitespace in JavaScript string
...a whitespaces, each time there's more than only one whitespace I'd like it be only one.
11 Answers
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How do I specify unique constraint for multiple columns in MySQL?
I have a table:
14 Answers
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Is there a performance difference between i++ and ++i in C++?
We have the question is there a performance difference between i++ and ++i in C?
17 Answers
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Can I split an already split hunk with git?
...t really is a fantastic feature.
I also discovered that a large hunk could be split into smaller hunks by hitting the s key, which adds to the precision of the commit.
But what if I want even more precision, if the split hunk is not small enough?
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Find the nth occurrence of substring in a string
This seems like it should be pretty trivial, but I am new at Python and want to do it the most Pythonic way.
21 Answers
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Why can't decimal numbers be represented exactly in binary?
There have been several questions posted to SO about floating-point representation. For example, the decimal number 0.1 doesn't have an exact binary representation, so it's dangerous to use the == operator to compare it to another floating-point number. I understand the principles behind floating-po...
How do you clone a BufferedImage
I have an object which has many bufferedimages in it, I want to create a new object copying all the bufferedimages into the new object, but these new images may be altered and i don't want the original object images to be altered by altering the new objects images.
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What do two question marks together mean in C#?
...se that, otherwise use what's to the right."
Note that you can use any number of these in sequence. The following statement will assign the first non-null Answer# to Answer (if all Answers are null then the Answer is null):
string Answer = Answer1 ?? Answer2 ?? Answer3 ?? Answer4;
Also it's wo...