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As I said in a comment above: It is not recommended to install some package in one python installation (e.g., some system-wide installation) and then import it into a totally different installation (e.g., the Sage installation).
It is important to keep in mind that Sage includes "batteries": It includes Python, it includes GAP, it includes Maxima, Singular, you name it. Hence, when you want to use a specific Python package in Sage then you should install it in Sage's Python, and nowhere else.
Hence, open a Sage shell (if sage is in your path then do "sage -sh"), and then do whatever is needed to install the package. Namely, in the Sage shell, "python" and "gap" and "singular" will automatically be Sage's versions, not the system-wide versions.
