大约有 14,100 项符合查询结果（耗时：0.0169秒） [XML]
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.
...
Drop columns whose name contains a specific string from pandas DataFrame
...
Here is one way to do this:
df = df[df.columns.drop(list(df.filter(regex='Test')))]
share
|
improve this answer
|
follow
|
...
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...
What is the iPad user agent?
...
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
share
|
improve this answe...
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...
In Python, how do I determine if an object is iterable?
...ter() would be better:
def iterable(obj):
try:
iter(obj)
except Exception:
return False
else:
return True
We've used iter() in our code as well for this purpose, but I've lately started to get more and more annoyed by objects which only have __getitem__ being c...
Python list of dictionaries search
...
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 ...
What does `someObject.new` do in Java?
...e with a containing instance other than this then you have to use the prefix notation.
Foo f = new Foo(5);
Foo.Bar b = f.new Bar();
b.printVal(); // prints 5
share
|
improve this answer
|...
How can I find a specific element in a List?
...
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;...
Setting environment variables on OS X
What is the proper way to modify environment variables like PATH in OS X?
31 Answers
...