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How to get arguments with flags in Bash
...
This example uses Bash's built-in getopts command and is from the Google Shell Style Guide:
a_flag=''
b_flag=''
files=''
verbose='false'
print_usage() {
printf "Usage: ..."
}
while getopts 'abf:v' flag; do
case "${flag}" in
a) a_flag='true' ;;
b) b_flag='true' ;;
...
Why does this loop produce “warning: iteration 3u invokes undefined behavior” and output more than 4
... note
We know that the standard says undefined behavior is unpredictable from the note that come with the definition which says:
[ Note: Undefined behavior may be expected when this International
Standard omits any explicit definition of behavior or when a program
uses an erroneous constru...
What is the most efficient way to create a dictionary of two pandas Dataframe columns?
...# Sort of sorted...
{'a': 1, 'b': 2, 'c': 3, 'd': 4, 'e': 5}
>>> from collections import OrderedDict
>>> OrderedDict(df.values.tolist())
OrderedDict([('a', 1), ('b', 2), ('c', 3), ('d', 4), ('e', 5)])
In Long
Explaining solution: dict(sorted(df.values.tolist()))
Given:
df = p...
Sort a list of tuples by 2nd item (integer value) [duplicate]
...hould be a function that identifies how to retrieve the comparable element from your data structure. In your case, it is the second element of the tuple, so we access [1].
For optimization, see jamylak's response using itemgetter(1), which is essentially a faster version of lambda x: x[1].
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I want to get the type of a variable at runtime
...sTag example, but uses an anonymous variable.
One can also get a ClassTag from a value's Class, like this:
val x: Any = 5
val y = 5
import scala.reflect.ClassTag
def f(a: Any, b: Any) = {
val B = ClassTag(b.getClass)
ClassTag(a.getClass) match {
case B => "a is the same class as b"
...
What is the purpose of the Visual Studio Hosting Process?
... The hosting process tends to keep DLLs loaded that I want to write to from another running copy of Visual Studio. Killing the hosting process, or even exiting and restarting the offending VS, does not help, because the newly started hosting process loads the DLL again. This is the reason why I ...
Collections.emptyList() vs. new instance
...let the compiler infer the type parameter of the generic method invocation from the target type: List<Foo> list = Collections.emptyList()
– Paul Jackson
May 15 '15 at 20:16
...
Android: how to draw a border to a LinearLayout
...age the xml shape drawable resource power if that fits your needs. With a "from scratch" project (for android-8), define res/layout/main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
...
How does the HyperLogLog algorithm work?
....
The problem is that the assumption of having evenly distributed numbers from 0 t 2^k-1 is too hard to achieve (the data we encountered is mostly not numbers, almost never evenly distributed, and can be between any values. But using a good hashing function you can assume that the output bits would...
Why do we need argc while there is always a null at the end of argv?
... says
2 ...argc shall be the number of arguments passed to the program from
the environment in which the program is run. .... The value of argc
shall be non-negative. The value of argv[argc] shall be 0.
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