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Which is the preferred way to concatenate a string in Python?
...timings with the timeit module:
a = a + b:
0.11338996887207031
a += b:
0.11040496826171875
However, those who recommend having lists and appending to them and then joining those lists, do so because appending a string to a list is presumably very fast compared to extending a string. And this can ...
When should I use perror(“…”) and fprintf(stderr, “…”)?
...ls due to out of range, I would use perror.
– freeboy1015
Aug 24 '12 at 2:22
6
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Google Guava isNullOrEmpty for collections
...e a limited number of votes per day, and answer down-votes cost you a tiny bit of reputation on top of that; use them wisely.stackoverflow.com/help/privileges/vote-down
– jeton
Dec 11 '15 at 18:01
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Creating a blurring overlay view
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edited Jul 8 '19 at 10:31
Eric
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Replacements for switch statement in Python?
...w a KeyError if no matching case is found
– martyglaubitz
May 18 '13 at 10:30
7
I thought about t...
Clear a terminal screen for real
...enerates a new one. The one disadvantage to reset is that it seems to be a bit slower (probably because it does more than just emit ESC c) but it's more portable.
– Laurence Gonsalves
Mar 20 '11 at 6:29
...
How do I grep for all non-ASCII characters?
...color='auto' -P -n "[^\x00-\x7F]" file.xml
Note also, that the important bit is the -P flag which equates to --perl-regexp: so it will interpret your pattern as a Perl regular expression. It also says that
this is highly experimental and grep -P may warn of unimplemented
features.
...
Is it safe to delete a NULL pointer?
... a C legacy). But deleting the same pointer twice (even after changing its bit pattern) is still a serious program error. Not by the wording of the standard, but by program logic and ownership. As is deleting a null pointer, since the null pointer corresponds to no object, so nothing could possibly ...
Metadata file … could not be found error when building projects
... reference to the new one.
In any case it seems that these messages are a bit of a red herring, I would check your build output and find the first project that fails to build and very carefully check the references on that project.
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YYYY-MM-DD format date in shell script
...
$(date +%F_%H-%M-%S)
can be used to remove colons (:) in between
output
2018-06-20_09-55-58
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