Add Division operation for complex number in Cmath (#220)

* Add __truediv__() for cmath

* Some changes

* Remove separate zero division case checks

* Test all binary operators

* Use is_close

python/cmath.py

@@ -65,6 +65,16 @@ class complex:
     def __rmul__(self, other):
         return self.__mul__(other)
     
+    def __truediv__(self, other):
+        if type(other) is complex:
+            denominator = other.real ** 2 + other.imag ** 2
+            real_part = (self.real * other.real + self.imag * other.imag) / denominator
+            imag_part = (self.imag * other.real - self.real * other.imag) / denominator
+            return complex(real_part, imag_part)
+        if type(other) in (int, float):
+            return complex(self.real / other, self.imag / other)
+        return NotImplemented
+    
     def __pow__(self, other: int | float):
         if type(other) in (int, float):
             return complex(self.__abs__() ** other * math.cos(other * phase(self)),

tests/10_cmath.py

@@ -1,6 +1,17 @@
 from cmath import isclose, sqrt, nan, inf, nanj, infj, log
 import math
 
+c1 = complex(3, 4)
+c2 = complex(2, 4.5)
+
+assert isclose(c1 + 5, complex(8, 4))
+assert isclose(c1 + c2, complex(5, 8.5))
+assert isclose(c1 - c2, complex(1, -0.5))
+assert isclose(c1*4, complex(12, 16))
+assert isclose(c1*c2, complex(-12, 21.5))
+assert isclose(c2/c1, complex(0.96, 0.22))
+assert isclose(c2**2, complex(-16.25, 17.99999999999999))
+
 assert 1+2j == complex(1, 2) == 2j+1
 
 assert isclose(1+2j + 3+4j, 4+6j)