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psycopg2: insert multiple rows with one query
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Alex Riley
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answered Apr 13 '12 at 19:53
ant32ant32
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Check if string matches pattern
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483
import re
pattern = re.compile("^([A-Z][0-9]+)+$")
pattern.match(string)
Edit: As noted in the...
Java switch statement: Constant expression required, but it IS constant
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13 Answers
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Booleans, conditional operators and autoboxing
...nd operand to boolean)
E2: `true ? null : false` - Boolean (autoboxing of 3rd operand to Boolean)
See Java Language Specification, section 15.25 Conditional Operator ? :
For E1, the types of the 2nd and 3rd operands are Boolean and boolean respectively, so this clause applies:
If one of the...
How does this CSS produce a circle?
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373
How does a border of 180 pixels with height/width-> 0px become a circle with a radius of...
Find index of last occurrence of a substring in a string
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Use .rfind():
>>> s = 'hello'
>>> s.rfind('l')
3
Also don't use str as variable name or you'll shadow the built-in str().
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Reference: Comparing PHP's print and echo
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3 0 > PRINT ~0 7
1 PRINT ~1 ~0
2 PRINT ~2 ~...
numpy: most efficient frequency counts for unique values in an array
...ncount(x)
ii = np.nonzero(y)[0]
And then:
zip(ii,y[ii])
# [(1, 5), (2, 3), (5, 1), (25, 1)]
or:
np.vstack((ii,y[ii])).T
# array([[ 1, 5],
[ 2, 3],
[ 5, 1],
[25, 1]])
or however you want to combine the counts and the unique values.
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