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Print number of keys in Redis
...uild_id:b63575307aaffe0a
redis_mode:standalone
os:Linux 5.4.0-1017-aws x86_64
arch_bits:64
multiplexing_api:epoll
atomicvar_api:atomic-builtin
gcc_version:9.3.0
process_id:2854672
run_id:90a5246f10e0aeb6b02cc2765b485d841ffc924e
tcp_port:6379
uptime_in_seconds:2593097
uptime_in_days:30
hz:10
configur...
Python (and Python C API): __new__ versus __init__
...xample that would hopefully make the difference clear:
a = Shape(sides=3, base=2, height=12)
b = Shape(sides=4, length=2)
print(a.area())
print(b.area())
# I want `a` and `b` to be an instances of either of 'Square' or 'Triangle'
# depending on number of sides and also the `.area()` method to do t...
How to check if there exists a process with a given pid in Python?
...format(pid)):
return True
return False
This applies to linux based systems only, obviously.
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How do I 'overwrite', rather than 'merge', a branch on another branch in Git?
...theirs' option?
First, setup a repository with 2 branches and 3 commits (1 base commit, and 1 commit per branch). You can find the sample repository on GitHub
$ git init
$ echo 'original' | tee file1 file2 file3
$ git commit -m 'initial commit'
$ git branch A
$ git branch B
$ git checkout A
$ echo '...
What's the correct way to convert bytes to a hex string in Python 3?
... convenient transformations like quoted-printable (fits into 7bits ascii), base64 (fits into alphanumerics), hex escaping, gzip and bz2 compression. In Python 2, you could do:
b'foo'.encode('hex')
In Python 3, str.encode / bytes.decode are strictly for bytes<->str conversions. Instead, you...
Getting current date and time in JavaScript
...
.getMonth() returns a zero-based number so to get the correct month you need to add 1, so calling .getMonth() in may will return 4 and not 5.
So in your code we can use currentdate.getMonth()+1 to output the correct value. In addition:
.getDate() re...
Rank function in MySQL
...ith | M | 35 | 9 |
| 19 | Zack | M | 35 | 9 |
Demo on db<>fiddle
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Javascript/DOM: How to remove all events of a DOM object?
..., eventReturner(), false)
// and later
removeAllListeners(div, 'click')
DEMO
Note: If your code runs for a long time and you are creating and removing a lot of elements, you would have to make sure to remove the elements contained in _eventHandlers when you destroy them.
...
How exactly does the callstack work?
...e variables. Such an anchor address is actually contained in the so-called base or frame pointer which is stored in the EBP register. The offsets, on the other hand, are clearly known at compile time and are therefore hardcoded into the machine code.
This graphic from Wikipedia shows what the typic...
What is memoization and how can I use it in Python?
...emoization" → "memorandum" → to be remembered) results of method calls based on the method inputs and then returning the remembered result rather than computing the result again. You can think of it as a cache for method results. For further details, see page 387 for the definition in Introducti...