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Execute command on all files in a directory
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One quick and dirty way which gets the job done sometimes is:
find directory/ | xargs Command
For example to find number of lines in all files in the current directory, you can do:
find . | xargs wc -l
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How do I check if file exists in Makefile so I can delete it?
...later when the target is built by make. If you delete the file in the meantime then the file won't be created. I have put in an edit to make it clearer.
– Michael
Jan 26 '19 at 10:58
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How to find the mime type of a file in python?
... Yeh, I didn\t have enough "points" to create comments at the time of writing this reply. But I probably should have written it as a comment, so that the @toivotuo could have edited his question.
– Simon Zimmermann
Jun 27 '10 at 6:59
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if A vs if A is not None:
... @cedbeu, Seems to depend on the value of A. I tested now python -m timeit -s"a=0" "if a: pass" "else: pass" is faster than python -m timeit -s"a=0" "if a is None: pass" "else: pass" but python -m timeit -s"a=1" "if a: pass" "else: pass" is slower. Might be platform dependant, see if you get ...
What is the difference between task and thread?
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In particular, the Task does not say why it is that it takes such a long time to return the value. It might be that it takes a long time to compute, or it might that it takes a long time to fetch. Only in the former case would you use a Thread to run a Task. (In .NET, threads are freaking expensiv...
Is std::unique_ptr required to know the full definition of T?
...portantly, when it is necessary to have a complete type, you get a compile-time error if you try to use the smart pointer with an incomplete type at that point.
No more undefined behavior:
If your code compiles, then you've used a complete type everywhere you need to.
class A
{
class impl;
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Else clause on Python while statement
... Actually a fairly useful construct for such a thing. Don't know how many times I've put found_it=False at the start of a loop, and then do an if check on found_it at the end
– Cruncher
Feb 19 at 18:51
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Is there a way to get rid of accents and convert a whole string to regular letters?
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This compiles the regular expression each time, which is fine if you only need it once, but if you need to do this with a lot of text, pre-compiling the regex is a win.
– David Conrad
Mar 3 '13 at 21:49
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What is the difference between .py and .pyc files? [duplicate]
...loads .pyc files before .py files, so if they're present, it can save some time by not having to re-compile the Python source code. You can get rid of them if you want, but they don't cause problems, they're not big, and they may save some time when running programs.
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What format string do I use for milliseconds in date strings on iPhone?
...imal places in the fractions-of-a-second component. (So ss.S will show the time to the nearest tenth of a second, for example.)
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