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bzrlib/textfile.py
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    """Check whether the supplied path is a text, not binary file.
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    Raise BinaryFile if a NUL occurs in the first 1024 bytes.
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    """
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    text_file(open(path, 'rb'))
 
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    f = open(path, 'rb')
 
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    try:
 
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        text_file(f)
 
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    finally:
 
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        f.close()