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pandas GroupBy columns with NaN (missing) values
...l stumbles over this--another workaround is to convert via .astype(str) to string before grouping. That will conserve the NaN's.
df = pd.DataFrame({'a': ['1', '2', '3'], 'b': ['4', np.NaN, '6']})
df['b'] = df['b'].astype(str)
df.groupby(['b']).sum()
a
b
4 1
6 3
nan 2
...
How to check if a user likes my Facebook Page or URL using Facebook's API
...KEN . "&page_id=" . FB_FANPAGE_ID);
That will return one of three:
string true string false json
formatted response of error if token
or page_id are not valid
I guess the only not-using-token way to achieve this is with the signed_request Jason Siffring just posted. My helper using PHP SDK...
How to convert a number to string and vice versa in C++
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Update for C++11
As of the C++11 standard, string-to-number conversion and vice-versa are built in into the standard library. All the following functions are present in <string> (as per paragraph 21.5).
string to numeric
float stof(const string&am...
Is it safe to use Project Lombok? [closed]
...le range for a numeric value? Or the permissible length and/or format of a String value? Or whether a String value is suitable for presenting to an end user? Or documenting what the property actually means, when its name can't possibly explain it in full? (JList.getLayoutOrientation and JList.setLay...
Declare and Initialize String Array in VBA
...
technically creates a variant array, not a string array. Of course the variant array might be an array of only strings, but this approach would also allow non-string data types: myArray = Array("A", "B", 12345, "D"...)
– David Zemens
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Using Python String Formatting with Lists
I construct a string s in Python 2.6.5 which will have a varying number of %s tokens, which match the number of entries in list x . I need to write out a formatted string. The following doesn't work, but indicates what I'm trying to do. In this example, there are three %s tokens and the list ...
Adding Core Data to existing iPhone project
...h the applicationDoumentsDirectory method should return NSURL instead of NSString.
– NSRover
May 9 '14 at 12:29
9
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What is the difference between .text, .value, and .value2?
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.Text gives you a string representing what is displayed on the screen for the cell. Using .Text is usually a bad idea because you could get ####
.Value2 gives you the underlying value of the cell (could be empty, string, error, number (double...
C++使用OLE/COM高速读写EXCEL的源码 - C/C++ - 清泛网 - 专注C/C++及内核技术
...l(BOOL bShow);
///检查一个CELL是否是字符串
//BOOL IsCellString(long iRow, long iColumn);
///检查一个CELL是否是数值
//BOOL IsCellInt(long iRow, long iColumn);
void SetCell(long irow, long icolumn,CString new_string);
///得到一个CELL的String
CString GetC...
How to printf uint64_t? Fails with: “spurious trailing ‘%’ in format”
...s towards a locale independent and/or locale selectable version of std::to_string(). The cppreference page still link only to std::to_chars(), which is not really what people need. I wonder if fmt and/or c++20 deal with it or not yet.
– ceztko
Nov 28 '19 at 0:2...