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hexadecimal string to byte array in python
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Note that bytes.fromhex throws an error when the input string has an odd number of characters: bytes.fromhex("aab") → ValueError: non-hexadecimal number found in fromhex() arg at position 3.
– Константин Ван
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PostgreSQL Crosstab Query
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This does not work for me, for postgresql. I get the error ERROR: 42803: aggregate function calls may not be nested
– Audrey
Nov 12 '14 at 12:05
1
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Compile, Build or Archive problems with Xcode 4 (and dependencies)
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I had a similar situation, but the unwanted error displayed due to incorrectly referencing a unrelated property which was in the same class (basically I forgot to use self.) - strange one.
– JARC
Jan 5 '13 at 0:18
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java.net.ConnectException: localhost/127.0.0.1:8080 - Connection refused
...e resources to the application from my machine. But i am getting the above error.
10 Answers
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Django migration strategy for renaming a model and relationship fields
...ions.RenameField('YetAnotherModel', 'foo', 'bar')
]
You may get some errors if you don't update the names where it's imported e.g. admin.py and even older migration files (!).
Update: As ceasaro mentions, newer versions of Django are usually able to detect and ask if a model is renamed. So tr...
How to print a number with commas as thousands separators in JavaScript
...;
const pass = result === expect;
console.log(`${pass ? "✓" : "ERROR ====>"} ${x} => ${result}`);
return pass;
}
let failures = 0;
failures += !test(0, "0");
failures += !test(100, "100");
failures += !test(1000, "1,000");
failures += !test(10000, "1...
How to make a phone call programmatically?
...ctivityNotFoundException e) {
Toast.makeText(getApplicationContext(), "Error in your phone call"+e.getMessage(), Toast.LENGTH_LONG).show();
}
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Thread pooling in C++11
...s always run, waiting for job to do.
I apologize if there are some syntax errors, I typed these code and and I have a bad memory. Sorry that I cannot provide you the complete thread pool code, that would violate my job integrity.
Edit: to terminate the pool, call the shutdown() method:
XXXX::shut...
Is there a performance difference between a for loop and a for-each loop?
...oduced in
release 1.5, gets rid of the clutter
and the opportunity for error by
hiding the iterator or index variable
completely. The resulting idiom
applies equally to collections and
arrays:
// The preferred idiom for iterating over collections and arrays
for (Element e : elements) {
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How to retry after exception?
...s = 3
for i in range(tries):
try:
do_the_thing()
except KeyError as e:
if i < tries - 1: # i is zero indexed
continue
else:
raise
break
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