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How to read the RGB value of a given pixel in Python?
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photo = Image.open('IN.jpg') #your image
photo = photo.convert('RGB')
width = photo.size[0] #define W and H
height = photo.size[1]
for y in range(0, height): #each pixel has coordinates
row = ""
for x in range(0, width):
RGB = photo.getpixel((x,y))
R,G,...
Java: How to convert List to Map
... have conversation with a colleague about what would be the optimal way to convert List to Map in Java and if there any specific benefits of doing so.
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How to display a specific user's commits in svn log?
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You can write a script to parse it, for example, in Python 2.6:
import sys
from xml.etree.ElementTree import iterparse, dump
author = sys.argv[1]
iparse = iterparse(sys.stdin, ['start', 'end'])
for event, elem in iparse:
if event == 'start' and elem.tag == 'log':
logNode = elem
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How to convert/parse from String to char in java?
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If your string contains exactly one character the simplest way to convert it to a character is probably to call the charAt method:
char c = s.charAt(0);
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A numeric string as array key in PHP
...se a numeric string like "123" as a key in a PHP array, without it being converted to an integer?
11 Answers
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Get exception description and stack trace which caused an exception, all as a string
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It is better than sys.exc_info() which is not good OO style and use global variable.
– WeiChing 林煒清
May 20 '16 at 4:00
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Unable to cast object of type 'System.DBNull' to type 'System.String`
... the first case @Alexander mentions -not matching any row- you can rely on Convert.ToString or any other Convert method if you are fine with the value they return when converting from null: empty string for strings, 0 for numeric values, false for boolean, MinValue for DateTime... msdn.microsoft.com...
How does type Dynamic work and how to use it?
...It is correct, scala.Dynamic doesn't have any members, it is just a marker interface - the concrete implementation is filled-in by the compiler. As for Scalas String Interpolation feature there are well defined rules describing the generated implementation. In fact, one can implement four different ...
What is the correct SQL type to store a .Net Timespan with values > 24:00:00?
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I'd probably convert the ticks into a time object like this: SELECT CAST(DATEADD(MILLISECOND, @Ticks/CAST(10000 AS BIGINT), '1900-01-01') AS TIME). The '1900-01-01' date doesn't matter, of course, it's just the third variable required by ...
How to calculate percentage with a SQL statement
...ase you overflow on the 100 multiplication (e.g. Arithmetic overflow error converting expression to data type int), replace it with division in denominator instead: cast((count(*) / (sum(count(*)) over() / 100)) AS DECIMAL(18, 2)) as Percentage
– Nikita G.
Jan ...