tarfile chokes on reading .tar file with no entries (but does fine if the same file is bzip2'ed)
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调研方向
首先复现针对空 .tar 归档所描述的失败，并将其与附带的 tarfail.tar.bz2 案例进行比较。阅读历史上的 tarfile.patch 以了解背景，然后验证 tarfile 是否能够一致地处理这两种归档形式，而不会在处理没有条目的归档时出错。
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描述
3.7 (EOL)
stdlib
type-bug
| BPO | 29760 |
|---|---|
| Nosy | @gustaebel, @posita |
| Files |
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 = None
closed_at = None
created_at = <Date 2017-03-08.19:32:09.906>
labels = ['3.7', 'type-bug', 'library']
title = "tarfile chokes on reading .tar file with no entries (but does fine if the same file is bzip2'ed)"
updated_at = <Date 2017-03-10.23:00:48.734>
user = 'https://github.com/posita'
bugs.python.org fields:
activity = <Date 2017-03-10.23:00:48.734>
actor = 'posita'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2017-03-08.19:32:09.906>
creator = 'posita'
dependencies = []
files = ['46712', '46719']
hgrepos = []
issue_num = 29760
keywords = ['patch']
message_count = 5.0
messages = ['289253', '289265', '289408', '289409', '289417']
nosy_count = 2.0
nosy_names = ['lars.gustaebel', 'posita']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue29760'
versions = ['Python 2.7', 'Python 3.5', 'Python 3.6', 'Python 3.7']
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