Python define problem

Question

Hi this is my coding so far, and yes I'm very new to this:

import pandas as pd

data= pd.read_csv("/Users/mattiaslindell/Desktop/Idea/Cancer AI/cancer.csv")
print(data)

x = dataset.drop(columns=["diagnosis(1=m, 0=b)"])

y = dataset["diagnosis(1=m, 0=b)"]

However I get this error message and do not know how to fix it:

NameError: name 'dataset' is not defined