Building a model using a polynomial function - Python

Question

there is a code that loads the sample, is trained. Next, he must build a polynomial model and a graph on the drawing

pastebin.com/GzxqL5tD

but I constantly fly out an error pastebin.com/FiDpQk7t

In the python is not strong, help please disassemble and fix it

an example of this task is here http://scikit-learn.org/stable/auto_examples/model_selection/plot_underfitting_overfitting.html#sphx-glr-auto-examples-model-selection-plot-underfitting-overfitting-py