大约有 42,000 项符合查询结果（耗时：0.0363秒） [XML]
How can I connect to MySQL in Python 3 on Windows?
I am using ActiveState Python 3 on Windows and wanted to connect to my MySQL database.
I heard that mysqldb was the module to use.
I can't find mysqldb for Python 3.
...
What's the correct way to convert bytes to a hex string in Python 3?
What's the correct way to convert bytes to a hex string in Python 3?
9 Answers
9
...
Programmatically obtain the Android API level of a device?
...
Vivek
8,4861313 gold badges7070 silver badges9999 bronze badges
answered Nov 2 '14 at 11:01
Arkadiusz Cieślińsk...
How to insert element into arrays at specific position?
...
23 Answers
23
Active
...
Find indices of elements equal to zero in a NumPy array
...
numpy.where() is my favorite.
>>> x = numpy.array([1,0,2,0,3,0,4,5,6,7,8])
>>> numpy.where(x == 0)[0]
array([1, 3, 5])
share
|
improve this answer
|
...
Operation on every pair of element in a list
...
233
Check out product() in the itertools module. It does exactly what you describe.
import iterto...
Numpy where function multiple conditions
...e values, then a and b returns b. So saying something like [0,1,2] and [2,3,4] will just give you [2,3,4]. Here it is in action:
In [230]: dists = np.arange(0,10,.5)
In [231]: r = 5
In [232]: dr = 1
In [233]: np.where(dists >= r)
Out[233]: (array([10, 11, 12, 13, 14, 15, 16, 17, 18, 19]),)
I...
How to get all subsets of a set? (powerset)
...
137
The Python itertools page has exactly a powerset recipe for this:
from itertools import chain,...
pandas: filter rows of DataFrame with operator chaining
...
398
I'm not entirely sure what you want, and your last line of code does not help either, but anyw...
Are tuples more efficient than lists in Python?
...s much faster than assigning a list.
>>> def a():
... x=[1,2,3,4,5]
... y=x[2]
...
>>> def b():
... x=(1,2,3,4,5)
... y=x[2]
...
>>> import dis
>>> dis.dis(a)
2 0 LOAD_CONST 1 (1)
3 LOAD_CONST ...