> In [65]: for i in range(3):
>    ....:   for j in range(3):
>    ....:     if i <= j:
>    ....:        for l in range(6):
>    ....:            J[k,l] = diff(Y[i,j], vars[l])
>    ....:        k=k+1
>    ....:
> IndentationError: expected an indented block

Is the indentation consistent - It seems like it varies between 3 and
4 spaces. Do you use tab instead of a space or mix tab and space?

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