大约有 47,000 项符合查询结果（耗时：0.0551秒） [XML]
Check whether an array is a subset of another
...
Cameron MacFarlandCameron MacFarland
63.2k1919 gold badges9898 silver badges128128 bronze badges
...
not None test in Python [duplicate]
...
1033
if val is not None:
# ...
is the Pythonic idiom for testing that a variable is not set to...
Converting NumPy array into Python List structure?
How do I convert a NumPy array to a Python List (for example [[1,2,3],[4,5,6]] ), and do it reasonably fast?
5 Answers
...
how to “reimport” module to python then code be changed after import
...
For Python 2.x
reload(foo)
For Python 3.x
import importlib
import foo #import the module here, so that it can be reloaded.
importlib.reload(foo)
share
|
impro...
Length of an integer in Python
...
341
If you want the length of an integer as in the number of digits in the integer, you can always...
Pairwise crossproduct in Python [duplicate]
...
3 Answers
3
Active
...
How to validate an Email in PHP?
... Manual should suffice.
Update 1: As pointed out by @binaryLV:
PHP 5.3.3 and 5.2.14 had a bug related to
FILTER_VALIDATE_EMAIL, which resulted in segfault when validating
large values. Simple and safe workaround for this is using strlen()
before filter_var(). I'm not sure about 5.3.4 fin...
JavaScript “new Array(n)” and “Array.prototype.map” weirdness
I've observed this in Firefox-3.5.7/Firebug-1.5.3 and Firefox-3.6.16/Firebug-1.6.2
14 Answers
...
Python - When to use file vs open
...
153
You should always use open().
As the documentation states:
When opening a file, it's prefer...
Convert floats to ints in Pandas?
...f= pd.DataFrame(range(5), columns=['a'])
df.a = df.a.astype(float)
df
Out[33]:
a
0 0.0000000
1 1.0000000
2 2.0000000
3 3.0000000
4 4.0000000
pd.options.display.float_format = '{:,.0f}'.format
df
Out[35]:
a
0 0
1 1
2 2
3 3
4 4
...