mirror of https://github.com/python/cpython
Added information about the interaction of opening a file in append mode
and seek() in the description of seek(). This closes SF bug #126850.
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@ -1079,7 +1079,12 @@ Files have the following methods:
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The \var{whence} argument is optional and defaults to \code{0}
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The \var{whence} argument is optional and defaults to \code{0}
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(absolute file positioning); other values are \code{1} (seek
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(absolute file positioning); other values are \code{1} (seek
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relative to the current position) and \code{2} (seek relative to the
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relative to the current position) and \code{2} (seek relative to the
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file's end). There is no return value.
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file's end). There is no return value. Note that if the file is
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opened for appending (mode \code{'a'} or \code{'a+'}), any
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\method{seek()} operations will be undone at the next write. If the
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file is only opened for writing in append mode (mode \code{'a'}),
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this method is essentially a no-op, but it remains useful for files
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opened in append mode with reading enabled (mode \code{'a+'}).
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\end{methoddesc}
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\end{methoddesc}
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\begin{methoddesc}[file]{tell}{}
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\begin{methoddesc}[file]{tell}{}
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