[SciPy-User] Should one NOT start with Cython first?

[Brian Merchant]

Recently, this question was asked on stackoverflow:Cython: when using typed
memoryviews, are Cython users supposed to implement their own library of
“vector” functions?
<http://stackoverflow.com/questions/28948175/cython-when-using-typed-memoryviews-are-cython-users-supposed-to-implement-the/28948871#28948871>

The current answer suggests that one should not write as much of the
program as possible using Cython. Rather, one should start with Python, and
then only use Cython for bottlenecks.

Is this the right mentality to have when using Cython for scientific
projects? Why not start Cython first from the get-go?
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