类变量的未定义变量名称

Question

Undefined Variable Name seems to be a common problem and I've followed the exact process as some of the examples on here, but I have not had any success.

From what I understand, you have to make a class if you have multiple functions, and then make an instance of the class to call these methods.

Here is my pseudo-code:

start = KMP()
start.read()


class KMP:

     def read(self):
         Text = "AGABBBACC"
         Pattern = "BBB"
         result = self.kmp(self, Pattern, Text)

     def kmp(self, Pattern, Text):
         ........
         ........
         return self.numOcc`

I'm getting a undefined name 'KMP', and I really don't understand why. Could anyone help me in solving this error?

Answer 1

You have to define something before you use it. In your case you're trying to create an instance of the class KMP before the code that defines KMP .

You need to move your first statement after the point in which you define the class.

class KMP:

     def read(self):
         Text = "AGABBBACC"
         Pattern = "BBB"
         result = self.kmp(self, Pattern, Text)

     def kmp(self, Pattern, Text):
         ........
         ........
         return self.numOcc`

start = KMP()
start.read()