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Create file object.
:param file: Existing file.
:param offset: Start of region, in bytes.
:param length: Size of region, in bytes.
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Move file pointer.
:param offset: Offset in bytes.
:param mode: Starting position. Use 0 for beginning of region, 1
for current offset, and 2 for end of region. You cannot move
the pointer outside the defined region.
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Get current file pointer.
:returns: Offset from start of region, in bytes.
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Read data.
:param n: Number of bytes to read. If omitted or zero,
read until end of region.
:returns: An 8-bit string.
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Read a line of text.
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