Unable to run IDLE without write-access to home directory

cane

BPO	8231
Nosy	@terryjreedy, @ned-deily, @serwy, @asvetlov, @roseman, @mlouielu
PRs	bpo-8231: Call idlelib.IdleConf.GetUserCfgDir only once. #2629 [3.6] bpo-8231: Call idlelib.IdleConf.GetUserCfgDir only once. (GH-2629) #2631
Dependencies	bpo-25507: IDLE: user code 'import tkinter; tkinter.font' should fail bpo-27534: IDLE: Reduce number and time for user process imports
Files	error.png: Error message @cfgdir.diff: Use temp dir as backup user config dir. @cfgdir2.diff

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = 'https://github.com/terryjreedy'
closed_at = None
created_at = <Date 2010-03-25.15:39:27.987>
labels = ['expert-IDLE', 'type-feature', '3.7']
title = 'Unable to run IDLE without write-access to home directory'
updated_at = <Date 2017-12-30.20:56:29.287>
user = 'https://bugs.python.org/cane'

bugs.python.org fields:

activity = <Date 2017-12-30.20:56:29.287>
actor = 'ned.deily'
assignee = 'terry.reedy'
closed = False
closed_date = None
closer = None
components = ['IDLE']
creation = <Date 2010-03-25.15:39:27.987>
creator = 'cane'
dependencies = ['25507', '27534']
files = ['16649', '40872', '40893']
hgrepos = []
issue_num = 8231
keywords = ['patch']
message_count = 34.0
messages = ['101708', '101716', '156771', '156773', '156774', '188115', '222687', '222694', '222709', '222716', '252042', '253404', '253413', '253414', '253561', '253575', '253588', '253604', '253637', '253668', '253681', '253714', '253719', '297255', '297914', '297915', '297923', '297926', '297976', '298023', '301835', '309247', '309250', '309257']
nosy_count = 9.0
nosy_names = ['terry.reedy', 'ned.deily', 'roger.serwy', 'asvetlov', 'markroseman', 'cane', 'John Gray', 'tealduck', 'louielu']
pr_nums = ['2629', '2631']
priority = 'normal'
resolution = None
stage = 'needs patch'
status = 'open'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue8231'
versions = ['Python 3.6', 'Python 3.7']