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Logic to test that 3 of 4 are True
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This is well defined in C++: the standard (§4.7/4) indicates that converting bool to int gives the expected values 0 or 1.
In Java and C#, you can use the following construct:
if ((a?1:0) + (b?1:0) + (c?1:0) + (d?1:0) == 3)
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Declaring an unsigned int in Java
...g l = ulong(1);
All of these types extend java.lang.Number and can be converted into higher-order primitive types and BigInteger. Hope this helps.
(Disclaimer: I work for the company behind these libraries)
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Convert columns to string in Pandas
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One way to convert to string is to use astype:
total_rows['ColumnID'] = total_rows['ColumnID'].astype(str)
However, perhaps you are looking for the to_json function, which will convert keys to valid json (and therefore your keys to s...
Post-install script with Python setuptools
...worked for me in a Python 3.5 environment:
import atexit
import os
import sys
from setuptools import setup
from setuptools.command.install import install
class CustomInstall(install):
def run(self):
def _post_install():
def find_module_path():
for p in sys.p...
What is a predicate in c#? [duplicate]
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They are not the same type and hence not convertible between each other.
– leppie
Nov 10 '09 at 19:02
2
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max value of integer
... in hex, because of the overflow (and equals to Integer.MIN_VALUE). If you convert it to unsigned (long), the sign bit will be treated like a value bit, so it will be 2147483648. Thank you for the char note. char is unsigned, you're right, but char is not really used for calculations, that's why I...
Get Mouse Position
...urself, by using an already implemented convinience method: SwingUtilities.convertPointFromScreen(MouseInfo.getPointerInfo().getLocation(), component)
– Andrei Vajna II
Aug 29 '14 at 10:48
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C# - how to determine whether a Type is a number
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Would have thought the compiler would do an implicit convertion of the switch-statement to hashset.
– Rolf Kristensen
Aug 5 '13 at 15:02
6
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Python: Using .format() on a Unicode-escaped string
...'\u2265'
>>> print s
works because print automatically uses the system encoding for your environment, which was likely set to UTF-8. (You can check by doing import sys; print sys.stdout.encoding)
>>> print "{0}".format(s)
fails because format tries to match the encoding of the ...
Determine the data types of a data frame's columns
...ric"
To change data type of a column:
library(hablar)
mtcars %>%
convert(chr(mpg, am),
int(carb))
converts columns mpg and am to character and the column carb to integer:
# A tibble: 32 x 11
mpg cyl disp hp drat wt qsec vs am gear carb
<chr> &l...