I see that error when i want to debug my python file:
C:\py>python optr_assigment.py<br>
**Traceback (most recent call last):<br>
File "optr_assigment.py", line 43, in <module><br>
aplikasi = DemoOperator()<br>
File "optr_assigment.py", line 8, in __in<br>
x = raw_input("Masukkan nilai x: ")<br>
NameError: name 'raw_input' is not defined**