work around to compile \r\n file

[quiver]

BPO	924771
Nosy	@birkenfeld
Files	compile.patch

^{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 = <Date 2007-08-23.20:15:47.807>
created_at = <Date 2004-03-28.06:40:13.000>
labels = ['library']
title = 'work around to compile \\r\\n file'
updated_at = <Date 2007-08-23.20:15:47.805>
user = 'https://bugs.python.org/quiver'

bugs.python.org fields:

activity = <Date 2007-08-23.20:15:47.805>
actor = 'georg.brandl'
assignee = 'none'
closed = True
closed_date = <Date 2007-08-23.20:15:47.807>
closer = 'georg.brandl'
components = ['Library (Lib)']
creation = <Date 2004-03-28.06:40:13.000>
creator = 'quiver'
dependencies = []
files = ['5899']
hgrepos = []
issue_num = 924771
keywords = ['patch']
message_count = 2.0
messages = ['45687', '55198']
nosy_count = 2.0
nosy_names = ['georg.brandl', 'quiver']
pr_nums = []
priority = 'normal'
resolution = 'out of date'
stage = None
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue924771'
versions = ['Python 2.3']

[quiver]

On Unix-like systems, built-in function compile cannot
compile files that don't use linefeed as an EOL. But there
are several codes in the library which assume that input
files use valid EOL characters.
So when they come across \r\n(or \r) on Unix
environments, compile causes the parser to raise a
SyntaxError.

For example:

>>> list(file('a.py'))
['\r\n']
>>> import trace
>>> trace.find_executable_linenos('a.py')
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
  File "/usr/lib/python2.3/trace.py", line 389, in 
find_executable_linenos
    code = compile(prog, filename, "exec")
  File "a.py", line 1

^

SyntaxError: invalid syntax

Lib/py_compile.py opens files with 'U' option to handle
file format differences and I think this is the way to go.

There is one drawback.
When Python is configured without universal newline
support, this approach doesn't work :-(

[birkenfeld]

The offending open() call in trace.py is fixed, so closing this.