大约有 49,000 项符合查询结果（耗时：0.0360秒） [XML]
Using numpy to build an array of all combinations of two arrays
...
10 Answers
10
Active
...
Logical operators for boolean indexing in Pandas
...
219
When you say
(a['x']==1) and (a['y']==10)
You are implicitly asking Python to convert (a['x'...
Numpy: Divide each row by a vector element
...
187
Here you go. You just need to use None (or alternatively np.newaxis) combined with broadcastin...
Operation on every pair of element in a list
... module. It does exactly what you describe.
import itertools
my_list = [1,2,3,4]
for pair in itertools.product(my_list, repeat=2):
foo(*pair)
This is equivalent to:
my_list = [1,2,3,4]
for x in my_list:
for y in my_list:
foo(x, y)
Edit: There are two very similar functions as...
How to convert list of tuples to multiple lists?
...
166
The built-in function zip() will almost do what you want:
>>> zip(*[(1, 2), (3, 4), ...
What is the syntax to insert one list into another list in python?
...
Do you mean append?
>>> x = [1,2,3]
>>> y = [4,5,6]
>>> x.append(y)
>>> x
[1, 2, 3, [4, 5, 6]]
Or merge?
>>> x = [1,2,3]
>>> y = [4,5,6]
>>> x + y
[1, 2, 3, 4, 5, 6]
>>> x.extend(y)
>&g...
Replacing NAs with latest non-NA value
...
18 Answers
18
Active
...
finding and replacing elements in a list
...
16 Answers
16
Active
...