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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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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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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...
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...
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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Print text instead of value from C enum
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answered Jul 2 '10 at 18:46
Tyler McHenryTyler McHenry
66.2k1515 gold badges112112 silver badges157157 bronze badges
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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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Which characters need to be escaped when using Bash?
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291
There are two easy and safe rules which work not only in sh but also bash.
1. Put the whole s...
Setting the correct encoding when piping stdout in Python
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162
Your code works when run in an script because Python encodes the output to whatever encoding you...
How to send JSON instead of a query string with $.ajax?
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257
You need to use JSON.stringify to first serialize your object to JSON, and then specify the co...