When using labels, both the start and the stop are included in the results.
import pandas as pd
import numpy as np
np.random.seed(5)
df = pd.DataFrame(np.random.randint(100, size=(5, 5)), columns = list("ABCDE"),
index = ["R" + str(i) for i in range(5)])
...
DataFrame:
import pandas as pd
import numpy as np
np.random.seed(5)
df = pd.DataFrame(np.random.randint(100, size=(5, 5)), columns = list("ABCDE"),
index = ["R" + str(i) for i in range(5)])
df
Out[12]:
A B C D E
R0 99 78 61 16 73...
Group by one column
Using the following DataFrame
df = pd.DataFrame({'A': ['a', 'b', 'c', 'a', 'b', 'b'],
'B': [2, 8, 1, 4, 3, 8],
'C': [102, 98, 107, 104, 115, 87]})
df
# Output:
# A B C
# 0 a 2 102
# 1 b 8 98
# 2 c 1 107
# 3 a...
Extension methods can be used for writing strongly typed wrappers for dictionary-like objects. For example a cache, HttpContext.Items at cetera...
public static class CacheExtensions
{
public static void SetUserInfo(this Cache cache, UserInfo data) =>
cache["UserInfo"] ...
Often when programming it is necessary to make some distinction between a variable that has a value and one that does not. For reference types, such as C Pointers, a special value such as null can be used to indicate that the variable has no value. For intrinsic types, such as an integer, it is mo...
In Swift, structures use a simple “dot syntax” to access their members.
For example:
struct DeliveryRange {
var range: Double
let center: Location
}
let storeLocation = Location(latitude: 44.9871,
longitude: -93.2758)
var pizzaRange = DeliveryRange(range: 200...
Installing OPAM
OPAM is a package manager for OCaml. It builds and manages compiler versions and OCaml libraries for you easily.
The easiest way to install OPAM on your operating system is to use a package manager for your system. e.g apt-get, yum or homebrew.
Mac OSX Installation Instructions
U...
You can also receive regular updates of the user's location; for example, as they move around while using a mobile device. Location tracking over time can be very sensitive, so be sure to explain to the user ahead of time why you're requesting this permission and how you'll use the data.
if (naviga...
The await keyword was added as part of C# 5.0 release which is supported from Visual Studio 2012 onwards. It leverages Task Parallel Library (TPL) which made the multi-threading relatively easier. The async and await keywords are used in pair in the same function as shown below. The await keyword is...
Under res folder, create a new folder called "anim" to store your animation resources and put this on that folder.
shakeanimation.xml
<?xml version="1.0" encoding="utf-8"?>
<rotate xmlns:android="http://schemas.android.com/apk/res/android"
and...
public class UnsafeLoader {
public static Unsafe loadUnsafe() {
return Unsafe.getUnsafe();
}
}
While this example will compile, it is likely to fail at runtime unless the Unsafe class was loaded with the primary classloader. To ensure that happens the JVM should be loaded with...
MySQL3.19
DROP TABLE IF EXISTS MyTable;
PostgreSQL8.x
DROP TABLE IF EXISTS MyTable;
SQL Server2005
If Exists(Select * From Information_Schema.Tables
Where Table_Schema = 'dbo'
And Table_Name = 'MyTable')
Drop Table dbo.MyTable
SQLite3.0
DROP TABLE IF EXI...
