a question about code completion
已回答

about code completion,
If i want to choose the second, I should click “↓+Tab”
Can I set something like "Ctrl+2" to choose the second option? Because I think it's more convinient for me.
thx and sry for my poor English.
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It option seems not exist. Try "SUBMIT A REQUEST"(Suggestion) to JetBrains's customer support.
Unfortunately PyCharm has no such feature, feel free to create a feature request in our bug tracker. Meanwhile you can record a macros for yourself:
Now you can bind this macros to hotkey in Settings | Keymap | Macros.