I am proficient in Python, but have no knowledge of R. Can you suggest a good tutorial in using rpy2 or any other R library to perform Block/Cokriging "Kriging"
I think if your are proficient in Python, you can manage the rpy2 part (there are examples here), but you need more a book on spatial statistics in R. That would probably be Applied Spatial Data Analysis with R. Section 8.5 is about spatial predictions. The book is available online through library subscription, but the code from the chapter is freely available (have a look at chunk 15 and following). gstat's vignette also provide step by step tutorial.
While I don't work with rpy2 a lot, I generally find it easier to work the R code in R, and once it's OK, run it through python.