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Code Golf: Lasers
...ts of %t for a character that matches > ^ < or v, and simultaneously sets $d to a value between 0 and 3 that indicates the initial direction of the laser beam.
At the beginning of each iteration in the main loop, we update $d if the beam is currently on a mirror. XOR'ing by 3 gives the correc...
How do I delete unpushed git commits?
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Delete the most recent commit, keeping the work you've done:
git reset --soft HEAD~1
Delete the most recent commit, destroying the work you've done:
git reset --hard HEAD~1
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Reading a binary file with python
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How do I list one filename per output line in Linux?
...angle non-ASCII and control characters in file names, these cases are a subset of those that do not require obtaining a file name from ls.
In python, there is absolutely no reason to invoke ls. Python has all of ls's functionality built-in. Use os.listdir to list the contents of a directory and os....
How to make grep only match if the entire line matches?
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Simply specify the regexp anchors.
grep '^ABB\.log$' a.tmp
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Detect if a NumPy array contains at least one non-numeric value?
...ent is NAN, does this solution involve iterating over the full array? If I set the first element to NAN, this still takes about 5microseconds, which seems quite slow for what can be done with an array lookup and a test -- should be nanoseconds, no?
– user48956
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Check if a class has a member function of a given signature
...rameter fails for first overload of check and it's discarded from overload set. It falls back to the second one that returns false_type. This is not a compiler error because SFINAE principle.
– jrok
Feb 20 '14 at 7:57
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Can a C++ enum class have methods?
...Flag2 = 0x02 , // Bit #1
Flag3 = 0x04 , // Bit #3
// aso ...
}
// Sets both lower bits
unsigned char flags = (unsigned char)(Flags::Flag1 | Flags::Flag2);
// Set Flag3
flags |= Flags::Flag3;
// Reset Flag2
flags &= ~Flags::Flag2;
Obviously one thinks of encapsulating the necessary o...
How to determine if a decimal/double is an integer?
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@MathewFoscarini - I think you're confused. It sets it to false, because the result of 16.1 - 6.1 is not an int. The point was to find if a given value is an int, not if something that is approximately an int is an int.
– Erik Funkenbusch
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How to redirect 'print' output to a file using python?
... actions to a file.
A simple example
Import logging, get the logger, and set the processing level:
import logging
logger = logging.getLogger()
logger.setLevel(logging.DEBUG) # process everything, even if everything isn't printed
If you want to print to stdout:
ch = logging.StreamHandler()
ch.s...