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Sum a list of numbers in Python
...rtunately, dividing an int by a float will produce a float, so we just use 2.0 for our divisor instead of 2.
Thus:
averages = [(x + y) / 2.0 for (x, y) in zip(my_list[:-1], my_list[1:])]
Question 2:
That use of sum should work fine. The following works:
a = range(10)
# [0,1,2,3,4,5,6,7,8,9]
b ...
Precision String Format Specifier In Swift
...ill going to be NSString formatting:
println(NSString(format:"%.2f", sqrt(2.0)))
Extrapolating from python, it seems like a reasonable syntax might be:
@infix func % (value:Double, format:String) -> String {
return NSString(format:format, value)
}
Which then allows you to use them as:
...
Simple way to encode a string according to a password?
...re cipher. It is one of the strongest of the simple ancient ciphers.
Vigenère cipher
It's quick and easy to implement. Something like:
import base64
def encode(key, string):
encoded_chars = []
for i in xrange(len(string)):
key_c = key[i % len(key)]
encoded_c = chr(ord(st...
How do I use $scope.$watch and $scope.$apply in AngularJS?
... Using this.myVar puts myVar on the scope.
– Marcus Rådell
Oct 3 '14 at 12:15
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Get Android API level of phone currently running my application [duplicate]
...Android 1.6 Donut
5 ECLAIR Android 2.0 Eclair
6 ECLAIR_0_1 Android 2.0.1 Eclair
7 ECLAIR_MR1 Android 2.1 Eclair
8 FROYO Android 2...
sed error: “invalid reference \1 on `s' command's RHS”
...use -r you don't have to escape the parentheses.
– qräbnö
Jan 13 '18 at 12:52
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How to work with complex numbers in C?
...e into complex, use _Complex_I macro from complex.h:
float _Complex d = 2.0f + 2.0f*_Complex_I;
(actually there can be some problems here with (0,-0i) numbers and NaNs in single half of complex)
Module is cabs(a)/cabsl(c)/cabsf(b); Real part is creal(a), Imaginary is cimag(a). carg(a) is for c...
What is the difference between Spring, Struts, Hibernate, JavaServer Faces, Tapestry?
...modern, standardized and very nice equivalent of the above frameworks: JSF 2.0 and Facelets for the presentation, JPA 2.0 for the persistence, Dependency Injection, etc. For a new development, this is IMO a serious option, Java EE 6 is a great stack.
See also
Choosing a Java Web Framework now?
Ja...
Flask-SQLAlchemy how to delete all rows in a single table
... Sep 17 '19 at 18:25
Ilja Everilä
36.6k55 gold badges7272 silver badges8686 bronze badges
answered May 15 '13 at 19:55
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Draw line in UIView
...orWithColor(context, [UIColor redColor].CGColor);
// Draw them with a 2.0 stroke width so they are a bit more visible.
CGContextSetLineWidth(context, 2.0f);
CGContextMoveToPoint(context, 0.0f, 0.0f); //start at this point
CGContextAddLineToPoint(context, 20.0f, 20.0f); //draw to t...