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What is the difference between range and xrange functions in Python 2.X?
Apparently xrange is faster but I have no idea why it's faster (and no proof besides the anecdotal so far that it is faster) or what besides that is different about
...
Test if lists share any items in python
...port timeit
>>> timeit('bool(set(a) & set(b))', setup="a=list(range(1000));b=list(range(1000))", number=100000)
26.077727576019242
>>> timeit('any(i in a for i in b)', setup="a=list(range(1000));b=list(range(1000))", number=100000)
0.16220548999262974
Here's a graph of the ex...
How can I represent an 'Enum' in Python?
...ke this:
def enum(*sequential, **named):
enums = dict(zip(sequential, range(len(sequential))), **named)
return type('Enum', (), enums)
and used like so:
>>> Numbers = enum('ZERO', 'ONE', 'TWO')
>>> Numbers.ZERO
0
>>> Numbers.ONE
1
Support for converting the v...
NSRange to Range
How can I convert NSRange to Range<String.Index> in Swift?
13 Answers
13
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How to get all subsets of a set? (powerset)
... list(iterable)
return chain.from_iterable(combinations(s, r) for r in range(len(s)+1))
Output:
>>> list(powerset("abcd"))
[(), ('a',), ('b',), ('c',), ('d',), ('a', 'b'), ('a', 'c'), ('a', 'd'), ('b', 'c'), ('b', 'd'), ('c', 'd'), ('a', 'b', 'c'), ('a', 'b', 'd'), ('a', 'c', 'd'), (...
Asking the user for input until they give a valid response
...t function:
def sanitised_input(prompt, type_=None, min_=None, max_=None, range_=None):
if min_ is not None and max_ is not None and max_ < min_:
raise ValueError("min_ must be less than or equal to max_.")
while True:
ui = input(prompt)
if type_ is not None:
...
Pagination in a REST web application
...
HTTP has great Range header which is suitable for pagination too. You may send
Range: pages=1
to have only first page. That may force you to rethink what is a page. Maybe client wants a different range of items. Range header also works t...
New Array from Index Range Swift
...
#1. Using Array subscript with range
With Swift 5, when you write…
let newNumbers = numbers[0...position]
… newNumbers is not of type Array<Int> but is of type ArraySlice<Int>. That's because Array's subscript(_:) returns an ArraySl...
How to reverse a string in Go?
... n := 0
rune := make([]rune, len(input))
for _, r := range input {
rune[n] = r
n++
}
rune = rune[0:n]
// Reverse
for i := 0; i < n/2; i++ {
rune[i], rune[n-1-i] = rune[n-1-i], rune[i]
...
How to implement an STL-style iterator and avoid common pitfalls?
...incredibly dangerous. Someone will try to use that to detect the end of a range while(it++), but all it really checks is if the iterator was constructed with a parameter.
– Mooing Duck
Dec 3 '18 at 22:26
...