def exactly_one_of()

in fxa/_utils.py [0:0]

• 3 lines of code
• 5 McCabe index (conditional complexity)

def exactly_one_of(p1_val, p1_name, p2_val, p2_name):
    if p1_val and p2_val or not p1_val and not p2_val:
        raise ValueError(f"must specify exactly one of '{p1_name}' or '{p2_name}'")