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Python Pandas: Get index of rows which column matches certain value
... index,
In [56]: idx = df.index[df['BoolCol']]
In [57]: idx
Out[57]: Int64Index([10, 40, 50], dtype='int64')
then you can select the rows using loc instead of iloc:
In [58]: df.loc[idx]
Out[58]:
BoolCol
10 True
40 True
50 True
[3 rows x 1 columns]
Note that loc can also accep...
Fastest way to determine if an integer's square root is an integer
...so answer yes for 0. (In reading the code below, note that my input is int64 x.)
if( x < 0 || (x&2) || ((x & 7) == 5) || ((x & 11) == 8) )
return false;
if( x == 0 )
return true;
Next, check if it's a square modulo 255 = 3 * 5 * 17. Because that's a product of three distin...
How to detect if app is being built for device or simulator in Swift
...ct iOS on a desktop architecture like follows
#if (arch(i386) || arch(x86_64)) && os(iOS)
...
#endif
After Swift 4.1 version
Latest use, now directly for all in one condition for all types of simulators need to apply only one condition -
#if targetEnvironment(simulator)
// y...
Unable to load DLL (Module could not be found HRESULT: 0x8007007E)
...
Current Directory
System folder, C:\windows\system32 or c:\windows\SysWOW64 (for 32-bit process on 64-bit box).
Reading from the Path environment variable
In addition I'd check the dependencies of the DLL, the dependency walker provided with Visual Studio can help you out here, it can also be do...
Setting Authorization Header of HttpClient
...
@Red fyi, the second parameter is the base64 encoded user:password (its not encrypted).
– n00b
Aug 1 '17 at 19:11
5
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What is the difference between “int” and “uint” / “long” and “ulong”?
I know about int and long (32-bit and 64-bit numbers), but what are uint and ulong ?
5 Answers
...
Simplest two-way encryption using PHP
...nary expected)
* @param boolean $encode - set to TRUE to return a base64-encoded
* @return string (raw binary)
*/
public static function encrypt($message, $key, $encode = false)
{
$nonceSize = openssl_cipher_iv_length(self::METHOD);
$nonce = openssl_random_pse...
Passing command line arguments from Maven as properties in pom.xml
...t>
.....
<profiles>
<profile>
<id>linux64</id>
<activation>
<activeByDefault>true</activeByDefault>
</activation>
<properties>
<build_os>linux</build_os>
&l...
Catch All Bugs with BugTrap! - 开源 & Github - 清泛网 - 专注IT技能提升
...urce code, documentation, setup (github)
What's new in this version?
64 bit support - now BugTrap natively supports Win64
Multi-monitor support - BugTrap may capture screenshots from several monitors
Other enhancements - Tons of features/options added since last update. See app history for d...
Catch All Bugs with BugTrap! - 开源 & Github - 清泛网 - 专注IT技能提升
...urce code, documentation, setup (github)
What's new in this version?
64 bit support - now BugTrap natively supports Win64
Multi-monitor support - BugTrap may capture screenshots from several monitors
Other enhancements - Tons of features/options added since last update. See app history for d...