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Python `if x is not None` or `if not x is None`?
I've always thought of the if not x is None version to be more clear, but Google's style guide and PEP-8 both use if x is not None . Is there any minor performance difference (I'm assuming not), and is there any case where one really doesn't fit (making the other a clear winner for my convent...
Retrieve list of tasks in a queue in Celery
How can I retrieve a list of tasks in a queue that are yet to be processed?
14 Answers
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Does Go have “if x in” construct similar to Python?
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There is no built-in operator to do it in Go. You need to iterate over the array. You can write your own function to do it, like this:
func stringInSlice(a string, list []string) bool {
for _, b := range list {
if b == a {
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Parse a URI String into Name-Value Collection
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If you are looking for a way to achieve it without using an external library, the following code will help you.
public static Map<String, String> splitQuery(URL url) throws UnsupportedEncodingException {
Map<String, String> query_pairs = new LinkedHashMap<String, String>();...
Appending to an empty DataFrame in Pandas?
Is it possible to append to an empty data frame that doesn't contain any indices or columns?
3 Answers
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Image inside div has extra space below the image
Why in the following code the height of the div is bigger than the height of the img ? There is a gap below the image, but it doesn't seems to be a padding/margin.
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How to configure git push to automatically set upstream without -u?
... to automatically set the upstream reference when I push a locally-created branch for the first time.
10 Answers
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How do I find a “gap” in running counter with SQL?
I'd like to find the first "gap" in a counter column in an SQL table. For example, if there are values 1,2,4 and 5 I'd like to find out 3.
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Version number comparison in Python
I want to write a cmp -like function which compares two version numbers and returns -1 , 0 , or 1 based on their compared valuses.
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Throttling method calls to M requests in N seconds
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I'd use a ring buffer of timestamps with a fixed size of M. Each time the method is called, you check the oldest entry, and if it's less than N seconds in the past, you execute and add another entry, otherwise you sleep for the time differe...