Python variables aren't typed. The result type is determined by the value (in Perl, it's usually determined by the operator). Float-vs-int-division is one of the annoying unnecessary incompatibilities in python3. 
> python2.7 -c 'print(5/2)'
2
> python3.5 -c 'print(5/2)'
2.5

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In reply to Re^4: solve cubic equations (Python) by no_slogan
in thread solve cubic equations by no_slogan

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