Getting model attributes from pipeline

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Did you look at the documentation: http://scikit-learn.org/dev/modules/pipeline.html
I feel it is pretty clear.

Update: in 0.21 you can use just square brackets:

pipeline['pca']

or indices

pipeline[1]

There are two ways to get to the steps in a pipeline, either using indices or using the string names you gave:

pipeline.named_steps['pca']
pipeline.steps[1][1]

This will give you the PCA object, on which you can get components.
With named_steps you can also use attribute access with a . which allows autocompletion:

pipeline.names_steps.pca.<tab here gives autocomplete>

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