大约有 42,000 项符合查询结果（耗时：0.0658秒） [XML]
Numpy - add row to array
...it is a 2D-array, how can you then compare its row to a number: i < 3?
EDIT after OP's comment:
A = array([[0, 1, 2], [0, 2, 0]])
X = array([[0, 1, 2], [1, 2, 0], [2, 1, 2], [3, 2, 0]])
add to A all rows from X where the first element < 3:
import numpy as np
A = np.vstack((A, X[X[:,0] <...
Why declare unicode by string in python?
... follow
|
edited Jul 3 '10 at 5:51
answered Jul 3 '10 at 4:34
...
fork() branches more than expected?
... follow
|
edited Jun 21 '12 at 7:04
answered Jun 21 '12 at 6:59
...
“x not in y” or “not x in y”
... follow
|
edited May 24 at 21:44
wjandrea
12.4k55 gold badges2424 silver badges4747 bronze badges
...
How do you share code between projects/solutions in Visual Studio?
... follow
|
edited Aug 24 '09 at 16:12
pupeno
246k110110 gold badges310310 silver badges500500 bronze badges
...
Vim: insert the same characters across multiple lines
Sometimes I want to edit a certain visual block of text across multiple lines.
12 Answers
...
Rspec doesn't see my model Class. uninitialized constant error
... follow
|
edited Aug 27 '14 at 15:46
Erik Escobedo
2,6152020 silver badges4040 bronze badges
...
Deep copy of a dict in python
...1:30:00) [MSC v.1500 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import copy
>>> my_dict = {'a': [1, 2, 3], 'b': [4, 5, 6]}
>>> my_copy = copy.deepcopy(my_dict)
>>> my_dict['a'][2] = 7
>>> my_copy['a...
Python Pandas: Get index of rows which column matches certain value
... follow
|
edited Mar 26 '19 at 9:48
Captain Lepton
34655 silver badges1717 bronze badges
...
SQLAlchemy: cascade delete
...n that were "removed" from the parent, even if the parent is not deleted)
EDIT: just found out: if you really want to define the relationship on the Child class, you can do so, but you will have to define the cascade on the backref (by creating the backref explicitly), like this:
parent = relation...