大约有 49,000 项符合查询结果（耗时：0.0416秒） [XML]
finding and replacing elements in a list
...
>>> a= [1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1]
>>> for n, i in enumerate(a):
... if i == 1:
... a[n] = 10
...
>>> a
[10, 2, 3, 4, 5, 10, 2, 3, 4, 5, 10]
...
MySQL foreign key constraints, cascade delete
...
answered May 26 '10 at 22:45
Marc BMarc B
333k3333 gold badges368368 silver badges452452 bronze badges
...
`elif` in list comprehension conditionals
...ere designed exactly for this sort of use-case:
>>> l = [1, 2, 3, 4, 5]
>>> ['yes' if v == 1 else 'no' if v == 2 else 'idle' for v in l]
['yes', 'no', 'idle', 'idle', 'idle']
Hope this helps :-)
share
...
Appropriate datatype for holding percent values?
...ent (e.g. 100.00% stored as 1.0000), I would store the data in a decimal(5,4) data type with a CHECK constraint that ensures that the values never exceed 1.0000 (assuming that is the cap) and never go below 0 (assuming that is the floor). If you are going to store their face value (e.g. 100.00% is s...
initializing a boolean array in java
...
answered Mar 2 '10 at 16:42
BalusCBalusC
953k341341 gold badges34193419 silver badges34053405 bronze badges
...
How to not run an example using roxygen2?
...
4 Answers
4
Active
...
What is the easiest way to push an element to the beginning of the array?
...
answered May 22 '11 at 1:48
mu is too shortmu is too short
385k6262 gold badges757757 silver badges727727 bronze badges
...
Numpy index slice without losing dimension information
...Joe Kington
223k5858 gold badges528528 silver badges435435 bronze badges
6
...
Pass a data.frame column name to a function
...|
edited Apr 11 '16 at 21:42
joran
152k2525 gold badges379379 silver badges431431 bronze badges
answered...
How to limit depth for recursive file list?
...
4 Answers
4
Active
...