"""Routines to test triangle properties without explicit instantiation."""
from trianglelib.shape import Triangle
def _make_triangle(a, b, c):
try:
return Triangle(a, b, c)
except ValueError:
return None
[docs]def is_triangle(a, b, c):
"""Return whether lengths `a`, `b`, `c` can be the sides of a triangle."""
t = _make_triangle(a, b, c)
return (t is not None)
[docs]def is_equilateral(a, b, c):
"""Return whether lengths `a`, `b`, and `c` are an equilateral triangle."""
t = _make_triangle(a, b, c)
return (t is not None) and t.is_equilateral()
[docs]def is_isosceles(a, b, c):
"""Return whether lengths `a`, `b`, and `c` are an isosceles triangle."""
t = _make_triangle(a, b, c)
return (t is not None) and t.is_isosceles()
[docs]def compute_perimeter(a, b, c):
"""Return the perimeer of the triangle with side lengths `a`, `b`, and `c`.
If the three lengths provided cannot be the sides of a triangle,
then the perimeter 0 is returned.
"""
t = _make_triangle(a, b, c)
return 0 if (t is None) else t.perimeter()
[docs]def compute_area(a, b, c):
"""Return the area of the triangle with side lengths `a`, `b`, and `c`.
If the three lengths provided cannot be the sides of a triangle,
then the area 0 is returned.
"""
t = _make_triangle(a, b, c)
return 0 if (t is None) else t.area()