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Add column with constant value to pandas dataframe [duplicate]
...le times.
# Wrong
df['new'] = [[]] * len(df)
# Right
df['new'] = [[] for _ in range(len(df))]
Generating a copy: df.assign(new=0)
If you need a copy instead, use DataFrame.assign:
df.assign(new='y')
A B C new
0 x x x y
1 x x x y
2 x x x y
3 x x x y
And, if you ne...
MFC Grid control 2.27 - C/C++ - 清泛网 - 专注IT技能提升
...ol OLE drag and drop target. Only necessary if you don't define GRIDCONTROL_NO_DRAGDROP in gridctrl.h
Titletip.cpp, Titletip.h
Titletips for cells, from Zafir Anjum. Only necessary if you don't define GRIDCONTROL_NO_TITLETIPS in gridctrl.h
Structure
The grid is based on...
MFC Grid control 2.27 - C/C++ - 清泛网 - 专注IT技能提升
...ol OLE drag and drop target. Only necessary if you don't define GRIDCONTROL_NO_DRAGDROP in gridctrl.h
Titletip.cpp, Titletip.h
Titletips for cells, from Zafir Anjum. Only necessary if you don't define GRIDCONTROL_NO_TITLETIPS in gridctrl.h
Structure
The grid is based on...
MFC Grid control 2.27 - C/C++ - 清泛网 - 专注IT技能提升
...ol OLE drag and drop target. Only necessary if you don't define GRIDCONTROL_NO_DRAGDROP in gridctrl.h
Titletip.cpp, Titletip.h
Titletips for cells, from Zafir Anjum. Only necessary if you don't define GRIDCONTROL_NO_TITLETIPS in gridctrl.h
Structure
The grid is based on...
MFC Grid control 2.27 - C/C++ - 清泛网 - 专注IT技能提升
...ol OLE drag and drop target. Only necessary if you don't define GRIDCONTROL_NO_DRAGDROP in gridctrl.h
Titletip.cpp, Titletip.h
Titletips for cells, from Zafir Anjum. Only necessary if you don't define GRIDCONTROL_NO_TITLETIPS in gridctrl.h
Structure
The grid is based on...
MFC Grid control 2.27 - C/C++ - 清泛网 - 专注IT技能提升
...ol OLE drag and drop target. Only necessary if you don't define GRIDCONTROL_NO_DRAGDROP in gridctrl.h
Titletip.cpp, Titletip.h
Titletips for cells, from Zafir Anjum. Only necessary if you don't define GRIDCONTROL_NO_TITLETIPS in gridctrl.h
Structure
The grid is based on...
MFC Grid control 2.27 - C/C++ - 清泛网 - 专注IT技能提升
...ol OLE drag and drop target. Only necessary if you don't define GRIDCONTROL_NO_DRAGDROP in gridctrl.h
Titletip.cpp, Titletip.h
Titletips for cells, from Zafir Anjum. Only necessary if you don't define GRIDCONTROL_NO_TITLETIPS in gridctrl.h
Structure
The grid is based on...
MFC Grid control 2.27 - C/C++ - 清泛网 - 专注IT技能提升
...ol OLE drag and drop target. Only necessary if you don't define GRIDCONTROL_NO_DRAGDROP in gridctrl.h
Titletip.cpp, Titletip.h
Titletips for cells, from Zafir Anjum. Only necessary if you don't define GRIDCONTROL_NO_TITLETIPS in gridctrl.h
Structure
The grid is based on...
MFC Grid control 2.27 - C/C++ - 清泛网 - 专注IT技能提升
...ol OLE drag and drop target. Only necessary if you don't define GRIDCONTROL_NO_DRAGDROP in gridctrl.h
Titletip.cpp, Titletip.h
Titletips for cells, from Zafir Anjum. Only necessary if you don't define GRIDCONTROL_NO_TITLETIPS in gridctrl.h
Structure
The grid is based on...
MFC Grid control 2.27 - C/C++ - 清泛网 - 专注IT技能提升
...ol OLE drag and drop target. Only necessary if you don't define GRIDCONTROL_NO_DRAGDROP in gridctrl.h
Titletip.cpp, Titletip.h
Titletips for cells, from Zafir Anjum. Only necessary if you don't define GRIDCONTROL_NO_TITLETIPS in gridctrl.h
Structure
The grid is based on...