[issue27891] Consistently group and sort imports within idlelib modules.

[Terry J. Reedy]

Terry J. Reedy added the comment:

This issue includes adding the idlelib import coding standard to idlelib.README.

The delayed-import issue is #27893.

A second followup will be to stop importing tkinter modules 'as' their Py 2 names.  Change "from tkinter import font as TkFont" to "from tkinter import font" and globally replace 'TkFont' with 'tkfont'.  Do the same for messagebox and any other submodules as needed.

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<https://bugs.python.org/issue27891>
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