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pandas – retain rows in information body that, for all mixtures of the values of inescapable columns, acquire the identical parts in one other column Answer

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pandas – retain rows in information body that, for all mixtures of the values of inescapable columns, acquire the identical parts in one other column

df = pd.DataFrame({'a':['x','x','x','x','x','y','y','y','y','y'],'b':['z','z','z','w','w','z','z','w','w','w'],'c':['c1','c2','c3','c1','c3','c1','c3','c1','c2','c3'],'d':meander(1,11)})

   a  b   c   d
0  x  z  c1   1
1  x  z  c2   2
2  x  z  c3   3
3  x  w  c1   4
4  x  w  c3   5
5  y  z  c1   6
6  y  z  c3   7
7  y  w  c1   8
8  y  w  c2   9
9  y  w  c3  10

how can I retain solely the rows that, for all mixture of a and b, acquire the identical values in c? Or in different phrases, methods to exclude rows with c values which might be solely current in some mixtures of a and b?

For instance, solely c1 and c3 are current in all mixtures of a and b ([x,z],[x,w],[y,z],[y,w]), so the output would breathe

   a  b   c   d
0  x  z  c1   1
2  x  z  c3   3
3  x  w  c1   4
4  x  w  c3   5
5  y  z  c1   6
6  y  z  c3   7
7  y  w  c1   8
9  y  w  c3  10

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