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What regular expression will match valid international phone numbers?
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23 Answers
23
Active
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How to get number of entries in a Lua table?
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132
You already have the solution in the question -- the only way is to iterate the whole table with...
Version number comparison in Python
... then compare the lists of numbers.
import re
def mycmp(version1, version2):
def normalize(v):
return [int(x) for x in re.sub(r'(\.0+)*$','', v).split(".")]
return cmp(normalize(version1), normalize(version2))
This is the same approach as Pär Wieslander, but a bit more compact:
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What do (lambda) function closures capture?
...e a new scope each time you create the lambda:
>>> adders = [0,1,2,3]
>>> for i in [0,1,2,3]:
... adders[i] = (lambda b: lambda a: b + a)(i)
...
>>> adders[1](3)
4
>>> adders[2](3)
5
The scope here is created using a new function (a lambda, for brevity...
Group by with multiple columns using lambda
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258
var query = source.GroupBy(x => new { x.Column1, x.Column2 });
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Generate a heatmap in MatPlotLib using a scatter data set
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12 Answers
12
Active
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How to make a chain of function decorators?
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2951
Check out the documentation to see how decorators work. Here is what you asked for:
from fun...
How to trace the path in a Breadth-First Search?
...aths.
# graph is in adjacent list representation
graph = {
'1': ['2', '3', '4'],
'2': ['5', '6'],
'5': ['9', '10'],
'4': ['7', '8'],
'7': ['11', '12']
}
def bfs(graph, start, end):
# maintain a queue of paths
queue = []
# push the first p...
What does 'predicate' mean in the context of computer science? [duplicate]
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edited Jun 20 at 9:12
Community♦
111 silver badge
answered Jul 12 '10 at 18:11
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Multi-line commands in GHCi
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answered Dec 9 '11 at 8:52
Nicolas WuNicolas Wu
4,26722 gold badges2222 silver badges3232 bronze badges
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