大约有 43,200 项符合查询结果（耗时：0.0448秒） [XML]
How do I get a UTC Timestamp in JavaScript?
...
16 Answers
16
Active
...
dplyr: “Error in n(): function should not be called directly”
...
120
I presume you have dplyr and plyr loaded in the same session. dplyr is not plyr. ddply is not ...
Does Python have a ternary conditional operator?
...ession:
>>> pass if False else x = 3
File "<stdin>", line 1
pass if False else x = 3
^
SyntaxError: invalid syntax
You can, however, use conditional expressions to assign a variable like so:
x = a if True else b
Think of the conditional expression as switching betwee...
Detect if a NumPy array contains at least one non-numeric value?
...
187
This should be faster than iterating and will work regardless of shape.
numpy.isnan(myarray)....
CASCADE DELETE just once
...
178
No. To do it just once you would simply write the delete statement for the table you want to ...
IE7 does not understand display: inline-block
...
301
The IE7 display: inline-block; hack is as follows:
display: inline-block;
*display: inline;
zoo...
python's re: return True if string contains regex pattern
...
155
import re
word = 'fubar'
regexp = re.compile(r'ba[rzd]')
if regexp.search(word):
print 'matc...
curl: (60) SSL certificate problem: unable to get local issuer certificate
... |
edited Feb 20 at 5:17
Bret Weinraub
1,04799 silver badges1717 bronze badges
answered Aug 5 '15 at...
try {} without catch {} possible in JavaScript?
...
11 Answers
11
Active
...