For loop in google colab prediction print next to the test columns

Well i am trying to print the predictions next to the actual test data so i can read them better but i get KeyError: 0 in google colab

#this works
pred = linear.predict(X_test)
print(pred)

for x in range(len(pred)):
  print(pred[x])

#this doesnt, i've seen this in a Python Machine Learning Tutorial and it works fine 
for x in range(len(pred)):
  print(pred[x],X_test[x],y_test[x])