大约有 41,400 项符合查询结果（耗时：0.0512秒） [XML]
psycopg2: insert multiple rows with one query
...
Alex Riley
117k3636 gold badges211211 silver badges195195 bronze badges
answered Apr 13 '12 at 19:53
ant32ant32
...
Check if string matches pattern
...
483
import re
pattern = re.compile("^([A-Z][0-9]+)+$")
pattern.match(string)
Edit: As noted in the...
Find index of last occurrence of a substring in a string
...
Use .rfind():
>>> s = 'hello'
>>> s.rfind('l')
3
Also don't use str as variable name or you'll shadow the built-in str().
share
|
improve this answer
|
...
How to increase scrollback buffer size in tmux?
...
3 Answers
3
Active
...
Java switch statement: Constant expression required, but it IS constant
...
13 Answers
13
Active
...
Jackson: how to prevent field serialization
...
|
edited May 13 '18 at 10:32
narendra-choudhary
3,57433 gold badges2727 silver badges4646 bronze badges
...
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.
...
How does this CSS produce a circle?
...
373
How does a border of 180 pixels with height/width-> 0px become a circle with a radius of...
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...