Start pyc file lock the file

[Jean-LouisTamburini]

BPO	33451
Nosy	@brettcannon, @pfmoore, @ncoghlan, @tjguk, @ericsnowcurrently, @berkerpeksag, @zware, @eryksun, @zooba, @miss-islington
PRs	bpo-33451: Close .pyc files before calling PyEval_EvalCode() #7884 [3.7] bpo-33451: Close pyc files before calling PyEval_EvalCode() (GH-7884) #7888 [3.6] bpo-33451: Close pyc files before calling PyEval_EvalCode() (GH-7884) #7889
Files	dummy.py

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

Show more details

GitHub fields:

assignee = None
closed_at = <Date 2018-08-14.13:16:53.566>
created_at = <Date 2018-05-09.20:43:58.880>
labels = ['interpreter-core', '3.8', 'type-bug', '3.7']
title = 'Start pyc file lock the file'
updated_at = <Date 2018-08-14.13:16:53.564>
user = 'https://bugs.python.org/Jean-LouisTamburini'

bugs.python.org fields:

activity = <Date 2018-08-14.13:16:53.564>
actor = 'berker.peksag'
assignee = 'none'
closed = True
closed_date = <Date 2018-08-14.13:16:53.566>
closer = 'berker.peksag'
components = ['Interpreter Core']
creation = <Date 2018-05-09.20:43:58.880>
creator = 'Jean-Louis Tamburini'
dependencies = []
files = ['47592']
hgrepos = []
issue_num = 33451
keywords = ['patch']
message_count = 7.0
messages = ['316330', '316667', '316832', '316843', '320346', '320349', '323518']
nosy_count = 11.0
nosy_names = ['brett.cannon', 'paul.moore', 'ncoghlan', 'tim.golden', 'eric.snow', 'berker.peksag', 'zach.ware', 'eryksun', 'steve.dower', 'miss-islington', 'Jean-Louis Tamburini']
pr_nums = ['7884', '7888', '7889']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue33451'
versions = ['Python 3.6', 'Python 3.7', 'Python 3.8']

[Jean-LouisTamburini]

Python v3.6.4:d48eceb
Windows 10.0.16299

I search on Internet and I don't find why Python Interpreter (v3.6.4) do that. With python 2.7, I don't have this "problem".

When I launch script like :
c:\Python364\python.exe compile.py
While the execution, I can rename/modify the file "compile.py".

But, when I compile the file to .pyc (with py_compile with an another script), and I launch the pyc like :
c:\Python364\python.exe dummy.pyc
While the execution, I CAN'T rename/modify the file because is locked by Python Interpreter.

It's normal ?

[Jean-LouisTamburini]

Same for python v3.6.5:f59c0932b4

[brettcannon]

There's no specific reason as to why that would happen as no files are kept open after importing is finished.

[eryksun]

In Python/pythonrun.c, PyRun_SimpleFileExFlags() reopens the PYC file in binary mode, passes it to run_pyc_file(), and only closes it after executing the script. The file should instead be closed in run_pyc_file(), before calling PyEval_EvalCode().

[ncoghlan]

New changeset ea73775 by Nick Coghlan (Zackery Spytz) in branch 'master':
bpo-33451: Close pyc files before calling PyEval_EvalCode() (GH-7884)
ea73775

[miss-islington]

New changeset 56aaef0 by Miss Islington (bot) in branch '3.7':
bpo-33451: Close pyc files before calling PyEval_EvalCode() (GH-7884)
56aaef0

[berkerpeksag]

All PRs have been merged (commit message from the 3.6 branch doesn't listed here but PR 7889 has been merged in 8f8ad2c) Closing this as 'fixed'. Please reopen if this issue needs to stay open.