cmath.py 文件源码

def isclose(a, b, *, rel_tol=1e-09, abs_tol=0.0):
    a = _make_complex(a)
    b = _make_complex(b)
    rel_tol = float(rel_tol)
    abs_tol = float(abs_tol)
    if rel_tol < 0 or abs_tol < 0:
        raise ValueError("tolerances must be non-negative")
    if a.real == b.real and a.imag == b.imag:
        return True
    if math.isinf(a.real) or math.isinf(a.imag) or math.isinf(b.real) \
            or math.isinf(b.imag):
        return False
    # if isnan(a) or isnan(b):
    #     return False
    diff = abs(a-b)
    return diff <= rel_tol * abs(a) or diff <= rel_tol * abs(b) or diff <= abs_tol