大约有 40,000 项符合查询结果(耗时:0.0684秒) [XML]

https://stackoverflow.com/ques... 

Applying a function to every row of a table using dplyr?

...it reflects the fact that when you're doing row wise operations you're actually working with tuples from a list of vectors (the columns in a dataframe). share | improve this answer | ...
https://stackoverflow.com/ques... 

WPF OpenFileDialog with the MVVM pattern? [duplicate]

...ou would consume it. public MyViewModel : ViewModel { private string _selectedPath; public string SelectedPath { get { return _selectedPath; } set { _selectedPath = value; OnPropertyChanged("SelectedPath"); } } private RelayCommand _openCommand; pu...
https://stackoverflow.com/ques... 

Remove duplicate dict in list in Python

... {'a': 3222, 'b': 1234}, {'a': 123, 'b': 1234}] seen = set() new_l = [] for d in l: t = tuple(d.items()) if t not in seen: seen.add(t) new_l.append(d) print new_l Example output: [{'a': 123, 'b': 1234}, {'a': 3222, 'b': 1234}] Note: As pointed out by @alexis ...
https://stackoverflow.com/ques... 

Why would finding a type's initializer throw a NullReferenceException?

....cs: (196c.1874): Access violation - code c0000005 (first chance) mscorlib_ni!System.RuntimeType.GetConstructorImpl(System.Reflection.BindingFlags, System.Reflection.Binder, System.Reflection.CallingConventions, System.Type[], System.Reflection.ParameterModifier[])+0xa3: 000007fe`e5735403 488b4608 ...
https://stackoverflow.com/ques... 

How to convert an array into an object using stdClass() [duplicate]

..., 'varsta' => 25) ); If you want to see is this stdClass object just call this print_r($clasa); If you want to convert an array to object code will be $arr = array('a'=>'apple','b'=>'ball'); $arr = (object) $arr; You don't need to use stdClass. It will automatically converted to st...
https://stackoverflow.com/ques... 

Forward function declarations in a Bash or a Shell script?

... This seems somewhat analogous to what if _ _ name _ _ == "_ _ main _ _": main() does in python – Sergiy Kolodyazhnyy Feb 13 '16 at 7:13 ...
https://stackoverflow.com/ques... 

Why do I get a segmentation fault when writing to a “char *s” initialized with a string literal, but

...the pointer to void * as in printf("%p", (void *)str); When printing a size_t with printf, you should use "%zu" if using the latest C standard (C99). – Chris Young Oct 3 '08 at 7:44 ...
https://stackoverflow.com/ques... 

Custom Adapter for List View

...lns:android="http://schemas.android.com/apk/res/android" android:layout_height="wrap_content" android:orientation="vertical" android:layout_width="fill_parent"> <TableRow android:layout_width="fill_parent" android:id="@+id/TableRow01" android:layout_hei...
https://stackoverflow.com/ques... 

Random “Element is no longer attached to the DOM” StaleElementReferenceException

...r valid. It's close to impossible for WebDriver to make a good guess about all the cases where this might happen - so it throws up its hands and gives control to you, who as the test/app author should know exactly what may or may not happen. What you want to do is explicitly wait until the DOM is in...
https://stackoverflow.com/ques... 

How do I add a path to PYTHONPATH in virtualenv

... You can usually avoid having to do anything with PYTHONPATH by using .pth files. Just put a file with a .pth extension (any basename works) in your virtualenv's site-packages folder, e.g. lib\python2.7\site-packages, with the absolute p...