linecache.getline() Returning Error

[JordanMeyer]

BPO	12867
Nosy	@ned-deily

^{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 2011-08-31.07:21:29.656>
created_at = <Date 2011-08-31.04:29:22.717>
labels = ['type-bug', 'library']
title = 'linecache.getline() Returning Error'
updated_at = <Date 2011-08-31.07:21:29.654>
user = 'https://bugs.python.org/JordanMeyer'

bugs.python.org fields:

activity = <Date 2011-08-31.07:21:29.654>
actor = 'ned.deily'
assignee = 'none'
closed = True
closed_date = <Date 2011-08-31.07:21:29.656>
closer = 'ned.deily'
components = ['Library (Lib)']
creation = <Date 2011-08-31.04:29:22.717>
creator = 'Jordan.Meyer'
dependencies = []
files = []
hgrepos = []
issue_num = 12867
keywords = []
message_count = 2.0
messages = ['143247', '143250']
nosy_count = 2.0
nosy_names = ['ned.deily', 'Jordan.Meyer']
pr_nums = []
priority = 'normal'
resolution = 'works for me'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue12867'
versions = ['Python 3.2']

[JordanMeyer]

In trying to use the linecache.getline() function to extra data from a plain-text database format that I'm building. Every time I make a call to it (even from the interpreter directly) I get an error like the one below. I believe the problem lies in the linecache module itself.

Traceback (most recent call last):
  File "/Users/jordanmeyer/Documents/Python/eFlashcard/alpha/0.1a2/eFlashcard_0.1a2.py", line 59, in <module>
    eFlashcard_main()
  File "/Users/jordanmeyer/Documents/Python/eFlashcard/alpha/0.1a2/eFlashcard_0.1a2.py", line 17, in eFlashcard_main
    eFlashcard_build()
  File "/Users/jordanmeyer/Documents/Python/eFlashcard/alpha/0.1a2/eFlashcard_0.1a2.py", line 31, in eFlashcard_build
    while str(linecache.getline(lib_file, lib_index, module_globals=None)) != '':
  File "/Library/Frameworks/Python.framework/Versions/3.2/lib/python3.2/linecache.py", line 15, in getline
    lines = getlines(filename, module_globals)
  File "/Library/Frameworks/Python.framework/Versions/3.2/lib/python3.2/linecache.py", line 41, in getlines
    return updatecache(filename, module_globals)
  File "/Library/Frameworks/Python.framework/Versions/3.2/lib/python3.2/linecache.py", line 76, in updatecache
    if not filename or (filename.startswith('<') and filename.endswith('>')):
AttributeError: '_io.TextIOWrapper' object has no attribute 'startswith'

[ned-deily]

The linecache module functions take a filename string as an argument, not a file object. Try:

   linecache.getlines("/path/to/filename", lineno)

http://docs.python.org/py3k/library/linecache.html