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Example invalid utf8 string?
... Markus Kuhn's UTF-8 decoder capability and stress test file
You'll find examples of many UTF-8 irregularities, including lonely start bytes, continuation bytes missing, overlong sequences, etc.
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Optimizing away a “while(1);” in C++0x
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Does someone have a good explanation of why this was necessary to allow?
Yes, Hans Boehm provides a rationale for this in N1528: Why undefined behavior for infinite loops?, although this is WG14 document the rationale applies to C++ as well and the ...
Drop columns whose name contains a specific string from pandas DataFrame
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Here is one way to do this:
df = df[df.columns.drop(list(df.filter(regex='Test')))]
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What is the iPad user agent?
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Mozilla/5.0(iPad; U; CPU iPhone OS 3_2 like Mac OS X; en-us) AppleWebKit/531.21.10 (KHTML, like Gecko) Version/4.0.4 Mobile/7B314 Safari/531.21.10
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Converting a generic list to a CSV string
...s.
List<int> myValues;
string csv = String.Join(",", myValues.Select(x => x.ToString()).ToArray());
For the general case:
IEnumerable<T> myList;
string csv = String.Join(",", myList.Select(x => x.ToString()).ToArray());
As you can see, it's effectively no different. Beware that y...
pandas DataFrame: replace nan values with average of columns
...ng set! Imagine it like this: We have 100 data rows and we consider column x. The first 99 entries of x are NA. We want to split off row 100 as a test set. Let's assume row 100 has value 20 in column x. Then you will replace all entries in the training set in column x with 20, a value coming 100% fr...
Compiler Ambiguous invocation error - anonymous method and method group with Func or Action
I have a scenario where I want to use method group syntax rather than anonymous methods (or lambda syntax) for calling a function.
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Python list of dictionaries search
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You can use a generator expression:
>>> dicts = [
... { "name": "Tom", "age": 10 },
... { "name": "Mark", "age": 5 },
... { "name": "Pam", "age": 7 },
... { "name": "Dick", "age": 12 }
... ]
>>> next(item for item ...
How can I find a specific element in a List?
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Use a lambda expression
MyClass result = list.Find(x => x.GetId() == "xy");
Note: C# has a built-in syntax for properties. Instead of writing getter and setter methods (as you might be used to from Java), write
private string _id;...
Merging dictionaries in C#
...tionary(pair => pair.Key, pair => pair.Value);
That will throw an exception if you get any duplicate keys.
EDIT: If you use ToLookup then you'll get a lookup which can have multiple values per key. You could then convert that to a dictionary:
var result = dictionaries.SelectMany(dict =>...