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[] and {} vs list() and dict(), which is better?
...ons can be done using the English names as well. Example: list(i for i in range(10) if i % 2)
– Zags
Jun 13 '14 at 19:37
4
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Sum a list of numbers in Python
...
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 = sum(a)
print b
# Prints 45
Also, you don't need to assign everything to a variable at every step along the way. print sum(a) works just fine.
You will have to be more specific about ex...
Convert a float64 to an int in Go
...func main() {
floats := []float64{1.9999, 2.0001, 2.0}
for _, f := range floats {
t := int(f)
s := fmt.Sprintf("%.0f", f)
if i, err := strconv.Atoi(s); err == nil {
fmt.Println(f, t, i)
} else {
fmt.Println(f, t, err)
}
}
}
...
iOS 7 TextKit - How to insert images inline with text?
...tringWithAttachment:textAttachment];
[attributedString replaceCharactersInRange:NSMakeRange(4, 1) withAttributedString:attrStringWithImage];
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f...
Detecting if an NSString contains…?
...
Here's how I would do it:
NSString *someString = @"Here is my string";
NSRange isRange = [someString rangeOfString:@"is " options:NSCaseInsensitiveSearch];
if(isRange.location == 0) {
//found it...
} else {
NSRange isSpacedRange = [someString rangeOfString:@" is " options:NSCaseInsensitiveSe...
How to convert vector to array
... vector():start_(0), finish_(0), end_of_storage_(0){}
//......
}
The range (start_, end_of_storage_) is all the array memory the vector allocate;
The range(start_, finish_) is all the array memory the vector used;
The range(finish_, end_of_storage_) is the backup array memory.
For example, ...
Creating a Pandas DataFrame from a Numpy array: How do I specify the index column and column headers
...32')]
values = numpy.zeros(20, dtype=dtype)
index = ['Row'+str(i) for i in range(1, len(values)+1)]
df = pandas.DataFrame(values, index=index)
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...
List directory in Go
...ir("./")
if err != nil {
log.Fatal(err)
}
for _, f := range files {
fmt.Println(f.Name())
}
}
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Difference between decimal, float and double in .NET?
...-8, while decimal will conflate 0.1 and 0.1 + 1e-29. Sure, within a given range, certain values can be represented in any format with zero loss of accuracy (e.g. float can store any integer up to 1.6e7 with zero loss of accuracy) -- but that's still not infinite accuracy.
– Da...
How do I build a numpy array from a generator?
...generator with numpy.stack:
>>> mygen = (np.ones((5, 3)) for _ in range(10))
>>> x = numpy.stack(mygen)
>>> x.shape
(10, 5, 3)
It also works for 1D arrays:
>>> numpy.stack(2*i for i in range(10))
array([ 0, 2, 4, 6, 8, 10, 12, 14, 16, 18])
Note that numpy.st...