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How to get item's position in a list?
... 3, 1, 2, 1, 6]
>>> [i for i,x in enumerate(testlist) if x == 1]
[0, 5, 7]
Update:
Okay, you want a generator expression, we'll have a generator expression. Here's the list comprehension again, in a for loop:
>>> for i in [i for i,x in enumerate(testlist) if x == 1]:
... p...
Open Cygwin at a specific folder
...
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edited Jul 30 '18 at 8:51
Toolkit
8,67066 gold badges4848 silver badges5656 bronze badges
...
Check if a given key already exists in a dictionary
... intended way to test for the existence of a key in a dict.
d = {"key1": 10, "key2": 23}
if "key1" in d:
print("this will execute")
if "nonexistent key" in d:
print("this will not")
If you wanted a default, you can always use dict.get():
d = dict()
for i in range(100):
key = i % 1...
How to crop an image using C#?
...aphics g = Graphics.FromImage(target))
{
g.DrawImage(src, new Rectangle(0, 0, target.Width, target.Height),
cropRect,
GraphicsUnit.Pixel);
}
share
...
How to create a file with a given size in Linux?
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answered Sep 26 '08 at 12:53
Ilya KochetovIlya Kochetov
16.5k66 gold badges4141 silver badges5858 bronze badges
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Creating a byte array from a stream
...c static byte[] ReadFully(Stream input)
{
byte[] buffer = new byte[16*1024];
using (MemoryStream ms = new MemoryStream())
{
int read;
while ((read = input.Read(buffer, 0, buffer.Length)) > 0)
{
ms.Write(buffer, 0, read);
}
return ms....
How to sort by two fields in Java?
...ame();
int sComp = x1.compareTo(x2);
if (sComp != 0) {
return sComp;
}
Integer x1 = ((Person) o1).getAge();
Integer x2 = ((Person) o2).getAge();
return x1.compareTo(x2);
}});
}
List<Persons> is now ...
How can you customize the numbers in an ordered list?
...
+150
This is the solution I have working in Firefox 3, Opera and Google Chrome. The list still displays in IE7 (but without the close brack...