>
> Apolagize if this is a stupid question. When I run  the following script
>
> import rpy2.robjects as robjects
> x=[5.05,6.75,3.21,2.65]
> y=[1.65,2.64,2.64,6.95]
> print robjects.r.cor(x,y,method="spearman")
>
>

rpy2 is a lot more careful with automatic conversions.  Try:

 
robjects.r.cor(robjects.FloatVector(x),robjects.FloatVector(y),method="spearman")
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