I've recently switched to IPython Notebook 3 (3.1.0-cbccb68 to be exact), the Anaconda version. Previously when I typed a function and opened a parenthesis like this:
time.sleep()
and if the cursor was between the parentheses then I would get a contextual overlay menu that displayed the function arguments. Now I don't see it, and although I've searched, I can't find out how I can turn on this functionality.
In 1.0, the functionality was bound to ( and tab and shift-tab, in 2.0 tab was deprecated but still functional in some unambiguous cases completing or inspecting were competing in many cases. Recommendation was to always use shift-Tab. ( was also added as deprecated as confusing in Haskell-like syntax to also push people toward Shift-Tab as it works in more cases. in 3.0 the deprecated bindings have been remove in favor of the official, present for 18+ month now Shift-Tab.
So press Shift-Tab.
Try Shift-Tab-Tab a bigger documentation appears, than with Shift-Tab. It's the same but you can scroll down.
Shift-Tab-Tab-Tab and the tooltip will linger for 10 seconds while you type.
Shift-Tab-Tab-Tab-Tab and the docstring appears in the pager (small part at the bottom of the window) and stays there.
来源：https://stackoverflow.com/questions/30855169/how-can-i-see-function-arguments-in-ipython-notebook-server-3