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Postgres: How to do Composite keys?
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Ismail Yavuz
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answered Aug 17 '09 at 2:59
pilcrowpilcrow
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How to convert list of tuples to multiple lists?
...nction zip() will almost do what you want:
>>> zip(*[(1, 2), (3, 4), (5, 6)])
[(1, 3, 5), (2, 4, 6)]
The only difference is that you get tuples instead of lists. You can convert them to lists using
map(list, zip(*[(1, 2), (3, 4), (5, 6)]))
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CSS: transition opacity on mouse-out?
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edited Oct 20 '15 at 9:40
Dave Everitt
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Difference between Ctrl+Shift+F and Ctrl+I in Eclipse
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How do you downgrade rubygems?
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Ryan BiggRyan Bigg
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sqlite alter table add MULTIPLE columns in a single statement
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Regex to match any character including new lines
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Add EBS to Ubuntu EC2 Instance
... (Ubuntu's internal name for this particular device number):
sudo mkfs.ext4 /dev/xvdf
Only format the file system if this is a new volume with no data on it. Formatting will make it difficult or impossible to retrieve any data that was on this volume previously.
Mount file system (with update to ...
How can I create a Set of Sets in Python?
...m the following list of lists:
t = [[], [1, 2], [5], [1, 2, 5], [1, 2, 3, 4], [1, 2, 3, 6]]
you can create your set in the following way:
t1 = set(frozenset(i) for i in t)
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