problem.py

r = abs(5)

def abs(values):
    """Extend abs function to work on lists"""
    
    import builtins

    if type(values) == list:
        for i in range(len(values)):
            values[i] = builtins.abs(values[i])
    else:
        values = builtins.abs(values)

    return values
  
t = abs(5)
print(builtins.abs(5))