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Assign pandas dataframe column dtypes
...nually.
In order to be flexible with fields and types I have successfully tested using StringIO + read_cvs which indeed does accept a dict for the dtype specification.
I usually get each of the files ( 5k-20k lines) into a buffer and create the dtype dictionaries dynamically.
Eventually I concat...
Custom error pages on asp.net MVC3
..."RemoteOnly" /> which is safe to deploy like that, and when you need to test your custom error page you'd set it to <customErrors mode="On" /> so you can verify that it works.
Note you also need to check if HttpContext.Current is null because an exception in Application_Start will still hi...
How to make rounded percentages add up to 100%
...[index] += deltaUnit);
return rounded;
}
It pass the following Unit test:
[TestMethod]
public void TestPerfectRounding()
{
CollectionAssert.AreEqual(Utils.GetPerfectRounding(
new List<decimal> {3.333m, 3.334m, 3.333m}, 10, 2),
new List<decimal> {3.33m, 3.34m, ...
Function pointers, Closures, and Lambda
...why, in C#, you can do:
int lessThan = 100;
Func<int, bool> lessThanTest = delegate(int i) {
return i < lessThan;
};
I used an anonymous delegate there as a closure (it's syntax is a little clearer and closer to C than the lambda equivalent), which captured lessThan (a stack variable)...
Can you list the keyword arguments a function receives?
... set() # All accepted
return set(argdict) - set(args)
And so a full test if it is callable is :
def isCallableWithArgs(func, argdict):
return not missingArgs(func, argdict) and not invalidArgs(func, argdict)
(This is good only as far as python's arg parsing. Any runtime checks for inv...
What's in an Eclipse .classpath/.project file?
..., then you should be OK with adding .classpath to .gitignore but I haven't tested it myself.
– Isaac
Sep 20 '19 at 4:47
2
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What is the difference between “screen” and “only screen” in media queries?
...to make sure it is not interpreted as
media="screen"
It would be a good test for someone with access to a device lab.
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C++ valarray vs. vector
...ce. Although the exact performance improvement undoubtedly varies, a quick test with simple code shows around a 2:1 improvement in speed, compared to identical code compiled with the "standard" implementation of valarray.
So, while I'm not entirely convinced that C++ programmers will be starting to...
pandas: How do I split text in a column into multiple rows?
...25 F01 300 1:13:37:1,13
If in column are NOT NaN values, the fastest solution is use list comprehension with DataFrame constructor:
df = pd.DataFrame(['a b c']*100000, columns=['col'])
In [141]: %timeit (pd.DataFrame(dict(zip(range(3), [df['col'].apply(lambda x : x.split(' ')[i]) for i ...
How do you make a web application in Clojure? [closed]
...ra's component (I think you are supposed to use the reload interceptor)
no testing facility for async interceptors
requires buy-in (?)
Aleph
Pro (3):
Performant
backpressure
Websocket/SSE support when returning a manifold stream
Cons (1):
Low level, do it yourself style (ie. it just gives ...