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How do I find the duplicates in a list and create another list with them?
... not hashable, you cannot use sets/dicts and have to resort to a quadratic time solution (compare each with each). For example:
a = [[1], [2], [3], [1], [5], [3]]
no_dupes = [x for n, x in enumerate(a) if x not in a[:n]]
print no_dupes # [[1], [2], [3], [5]]
dupes = [x for n, x in enumerate(a) if...
Convert timestamp to readable date/time PHP
I have a timestamp stored in a session (1299446702).
13 Answers
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Why start an ArrayList with an initial capacity?
...atedly reallocated as the list grows.
The larger the final list, the more time you save by avoiding the reallocations.
That said, even without pre-allocation, inserting n elements at the back of an ArrayList is guaranteed to take total O(n) time. In other words, appending an element is an amortize...
Converting ISO 8601-compliant String to java.util.Date
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Unfortunately, the time zone formats available to SimpleDateFormat (Java 6 and earlier) are not ISO 8601 compliant. SimpleDateFormat understands time zone strings like "GMT+01:00" or "+0100", the latter according to RFC # 822.
Even if Java 7 a...
Fetch frame count with ffmpeg
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Calculate it based on time, instead.
That's what I do and it works great for me, and many others.) First, find the length of the video in the below snippet:
Seems stream 0 codec frame rate differs from container frame rate: 5994.00
(5994/1) ->...
Simple Vim commands you wish you'd known earlier [closed]
I'm learning new commands in Vim all the time, but I'm sure everyone learns something new once in a while. I just recently learned about this:
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What does f+++++++++ mean in rsync logs?
...nes:
1 - A huge advantage of rsync is that after an interruption the next time it continues smoothly.
The next rsync invocation will not transfer the files again, that it had already transferred, if they were not changed in the meantime. But it will start checking all the files again from the begi...
Java: splitting a comma-separated string but ignoring commas in quotes
... " %s* "+ // match 'otherThanQuote' zero or more times
" %s "+ // match 'quotedString'
" )* "+ // end group 1 and repeat it zero or more times
" %s* "+ // ...
How do I represent a time only value in .NET?
Is there a way one can represent a time only value in .NET without the date? For example, indicating the opening time of a shop?
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Simple way to repeat a String in java
...simple commons method or operator that allows me to repeat some String n times. I know I could write this using a for loop, but I wish to avoid for loops whenever necessary and a simple direct method should exist somewhere.
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