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Pandas DataFrame Groupby two columns and get counts
...In [56]: df.groupby(['col5','col2']).size().reset_index().groupby('col2')[[0]].max()
Out[56]:
0
col2
A 3
B 2
C 1
D 3
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Why Android Studio says “Waiting For Debugger” if am NOT debugging?
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John LewinJohn Lewin
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How to create PDFs in an Android app? [closed]
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Rubens Mariuzzo
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answered Dec 30 '10 at 19:28
nikib3ronikib3ro
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Replace a character at a specific index in a string?
...r replaced.
String myName = "domanokz";
String newName = myName.substring(0,4)+'x'+myName.substring(5);
Or you can use a StringBuilder:
StringBuilder myName = new StringBuilder("domanokz");
myName.setCharAt(4, 'x');
System.out.println(myName);
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How to jump to a particular line in a huge text file?
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30
linecache:
The linecache module allows one to get any line from a Python source file, while ...
JavaScript equivalent of jQuery's extend method
... if(arguments[i].hasOwnProperty(key))
arguments[0][key] = arguments[i][key];
return arguments[0];
}
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Check whether HTML element has scrollbars
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edited Dec 30 '16 at 10:30
Limon Monte
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Why is argc not a constant?
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The C standard (ISO/IEC 9899:2011) says:
5.1.2.2.1 Program startup
¶1 The function called at program startup is named main. The implementation declares no
prototype for this function. It shall be defined with a return type of int and with no
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Can you get the column names from a SqlDataReader?
...= cmd.ExecuteReader();
var columns = new List<string>();
for(int i=0;i<reader.FieldCount;i++)
{
columns.Add(reader.GetName(i));
}
or
var columns = Enumerable.Range(0, reader.FieldCount).Select(reader.GetName).ToList();
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XP风格按钮的实现 - C/C++ - 清泛网 - 专注C/C++及内核技术
...txt改名为 “程序名.manifest”就可以了。
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<assembly xmlns="urn:schemas-microsoft-com:asm.v1" manifestVersion="1.0">
<assemblyIdentity name="XP style manifest" processorArchitecture="x86" version="1.0.0.0" type="win32"/>
<depe...