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| author | Alexandre Vassalotti <alexandre@peadrop.com> | 2009-07-22 03:07:33 (GMT) |
|---|---|---|
| committer | Alexandre Vassalotti <alexandre@peadrop.com> | 2009-07-22 03:07:33 (GMT) |
| commit | d2bb18b28165ccc6e4678e8046abe6ea7c9677b3 (patch) | |
| tree | edacc105f2321cdabb57bced5730c7e9d2610dfe /Lib/_pyio.py | |
| parent | e671fd206b1fe31fdad7a9ec570fffe390ec56ee (diff) | |
| download | cpython-d2bb18b28165ccc6e4678e8046abe6ea7c9677b3.zip cpython-d2bb18b28165ccc6e4678e8046abe6ea7c9677b3.tar.gz cpython-d2bb18b28165ccc6e4678e8046abe6ea7c9677b3.tar.bz2 | |
Issue #6241: Better type checking for the arguments of io.StringIO.
Diffstat (limited to 'Lib/_pyio.py')
| -rw-r--r-- | Lib/_pyio.py | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/Lib/_pyio.py b/Lib/_pyio.py index bbf65bc..5458f99 100644 --- a/Lib/_pyio.py +++ b/Lib/_pyio.py @@ -1924,8 +1924,10 @@ class StringIO(TextIOWrapper): # C version, even under Windows. if newline is None: self._writetranslate = False - if initial_value: + if initial_value is not None: if not isinstance(initial_value, str): + raise TypeError("initial_value must be str or None, not {0}" + .format(type(initial_value).__name__)) initial_value = str(initial_value) self.write(initial_value) self.seek(0) |