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How to write file if parent folder doesn't exist?
...you could go with async/await like this gist: gist.github.com/lucasreppewelander/…
– Lucas Reppe Welander
Mar 8 '18 at 21:48
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How to convert image to byte array
Can anybody suggest how I can convert an image to a byte array and vice versa?
12 Answers
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How do you list the active minor modes in emacs?
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C-h m or M-x describe-mode shows all the active minor modes (and major mode) and a brief description of each.
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Vagrant's port forwarding not working [closed]
... with a simple HTTP server you can use -- go to the folder with index.html and run sudo python -m SimpleHTTPServer 80, then try hitting that with curl from both boxes. If that works, then it's probably an Apache configuration issue. I don't have enough experience with Apache to help if that's the ...
Why do std::shared_ptr work
...g delete). When the shared_ptr is destroyed, it calls that stored function and that will call the deleter.
A simple sketch of the type erasure that is going on simplified with std::function, and avoiding all reference counting and other issues can be seen here:
template <typename T>
void del...
How to avoid java.util.ConcurrentModificationException when iterating through and removing elements
...ould have mentioned that i remove the elements in another part of the code and not the loop itself.
– RoflcoptrException
Nov 12 '11 at 13:28
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How to save all the variables in the current python session?
...s()[key]
except TypeError:
#
# __builtins__, my_shelf, and imported modules can not be shelved.
#
print('ERROR shelving: {0}'.format(key))
my_shelf.close()
To restore:
my_shelf = shelve.open(filename)
for key in my_shelf:
globals()[key]=my_shelf[key]
my_she...
How can I join elements of an array in Bash?
...a #a
The code above is based on the ideas by @gniourf_gniourf, @AdamKatz, and @MattCowell.
Alternatively, a simpler function that supports only single character delimiter, would be:
function join_by { local IFS="$1"; shift; echo "$*"; }
For example,
join_by , a "b c" d #a,b c,d
join_by / var local...
Why is address zero used for the null pointer?
...ll pointer in C source while represented differently at runtime. The C++ standard has a note that makes clear that converting "an integral constant expression with value zero always yields a null pointer, but converting other expressions that happen to have value zero need not yield a null pointer"....
Beginners Guide to Haskell? [closed]
...aven't been able to find one that seems interesting enough to read through and/or makes sense.
16 Answers
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