Extract data set

Q1: can I extract the data set at every time step in the CSV format including every cell point with coordinate (x, y,z) value?
Q2: As I know data are saved every time step in vtu format, I found the cell data in 6000 nodes (geometry cell 6000) while point data are found in 6230 rows. could you know the region?
Q3: can i extract by python code?