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Fast check for NaN in NumPy
...hine it is about 2.5x faster to use numpy.sum in place of numpy.min:
In [13]: %timeit np.isnan(np.min(x))
1000 loops, best of 3: 244 us per loop
In [14]: %timeit np.isnan(np.sum(x))
10000 loops, best of 3: 97.3 us per loop
Unlike min, sum doesn't require branching, which on modern hardware tends...
How to start an application using android ADB tools?
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638
adb shell
am start -n com.package.name/com.package.name.ActivityName
Or you can use this dire...
How to check whether a string is a valid HTTP URL?
...ttp;
Or, if you want to accept both HTTP and HTTPS URLs as valid (per J0e3gan's comment):
Uri uriResult;
bool result = Uri.TryCreate(uriName, UriKind.Absolute, out uriResult)
&& (uriResult.Scheme == Uri.UriSchemeHttp || uriResult.Scheme == Uri.UriSchemeHttps);
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pydot and graphviz error: Couldn't import dot_parser, loading of dot files will not be possible
...t;= 1.1:
The incompatibility of (upstream) pydot has been fixed by 6dff94b3f1, and thus pydot >= 1.1 will be compatible with pyparsing >= 1.5.7.
Answer applicable to pydot <= 1.0.28:
For anyone else who comes across this, it is due to the changes in pyparsing from 1.x to the 2.x releas...
Remove multiple whitespaces
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398
You need:
$ro = preg_replace('/\s+/', ' ',$row['message']);
You are using \s\s+ which means...
Pickle incompatibility of numpy arrays between Python 2 and 3
I am trying to load the MNIST dataset linked here in Python 3.2 using this program:
7 Answers
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What is the strict aliasing rule?
... msg) onto a buffer of the word size of your system (like a pointer to uint32_ts or uint16_ts). When you overlay a struct onto such a buffer, or a buffer onto such a struct through pointer casting you can easily violate strict aliasing rules.
So in this kind of setup, if I want to send a message to ...
Python memoising/deferred lookup property decorator
...est()
>>> t.__dict__
{}
>>> t.a
generating "a"
[0, 1, 2, 3, 4]
>>> t.__dict__
{'_lazy_a': [0, 1, 2, 3, 4]}
>>> t.a
[0, 1, 2, 3, 4]
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How to test if string exists in file with Bash?
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13 Answers
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IE 8: background-size fix [duplicate]
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edited May 23 '17 at 12:17
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answered Feb 7 '12 at 0:26
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