Python IDLE no longer opens after clicking on its icon

[8962avi]

BPO	42621
Nosy	@terryjreedy
Files	error.png: error while trying to run python 3.9 from cmd.

^{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 = <Date 2020-12-11.15:52:21.947>
created_at = <Date 2020-12-11.12:30:59.914>
labels = ['expert-IDLE', 'type-bug', 'invalid', '3.9']
title = 'Python IDLE no longer opens after clicking on its icon'
updated_at = <Date 2020-12-11.22:14:54.672>
user = 'https://bugs.python.org/8962avi'

bugs.python.org fields:

activity = <Date 2020-12-11.22:14:54.672>
actor = 'terry.reedy'
assignee = 'terry.reedy'
closed = True
closed_date = <Date 2020-12-11.15:52:21.947>
closer = '8962avi'
components = ['IDLE']
creation = <Date 2020-12-11.12:30:59.914>
creator = '8962avi'
dependencies = []
files = ['49666']
hgrepos = []
issue_num = 42621
keywords = []
message_count = 4.0
messages = ['382864', '382865', '382873', '382892']
nosy_count = 3.0
nosy_names = ['terry.reedy', 'zhtw1234', '8962avi']
pr_nums = []
priority = 'normal'
resolution = 'not a bug'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue42621'
versions = ['Python 3.9']

[8962avi]

I was able to use python IDLE earlier. But when I tried to open now, I was unable to open Python 3.7 IDLE. I have tried uninstalling and reinstalling Python(different versions) and deleting the .idlerc folder. I am using Windows 10.

[8962avi]

I downloaded the .exe file from python.org
After trying to open the idle from cmd "py -3.9 -m idlelib", the error shown in picture comes.(python 3.7 was also showing same error)

[8962avi]

I tried deleting Environment Variables which has python. and now it is working.

[terryjreedy]

https://docs.python.org/3/library/idle.html#startup-failure says
"A common cause of failure is a user-written file with the same name as a standard library module, such as random.py and tkinter.py. When such a file is located in the same directory as a file that is about to be run, IDLE cannot import the stdlib file. The current fix is to rename the user file."

In this case, the offending file and name is your Desktop/code.py. Rename it.