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Python Library Reference

Previous: 12.10 multifile Up: 12.10 multifile Next: 12.10.2 MultiFile Example

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12.10.1 MultiFile Objects

A MultiFile instance has the following methods:

readline(

str)

Read a line. If the line is data (not a section-divider or end-marker or real EOF) return it. If the line matches the most-recently-stacked boundary, return '' and set self.last to 1 or 0 according as the match is or is not an end-marker. If the line matches any other stacked boundary, raise an error. On encountering end-of-file on the underlying stream object, the method raises Error unless all boundaries have been popped.

readlines(

str)

Return all lines remaining in this part as a list of strings.

read(

)

Read all lines, up to the next section. Return them as a single (multiline) string. Note that this doesn't take a size argument!

seek(

pos[, whence])

Seek. Seek indices are relative to the start of the current section. The pos and whence arguments are interpreted as for a file seek.

tell(

)

Return the file position relative to the start of the current section.

next(

)

Skip lines to the next section (that is, read lines until a section-divider or end-marker has been consumed). Return true if there is such a section, false if an end-marker is seen. Re-enable the most-recently-pushed boundary.

is_data(

str)

Return true if str is data and false if it might be a section boundary. As written, it tests for a prefix other than '--' at start of line (which all MIME boundaries have) but it is declared so it can be overridden in derived classes.

Note that this test is used intended as a fast guard for the real boundary tests; if it always returns false it will merely slow processing, not cause it to fail.

push(

str)

Push a boundary string. When an appropriately decorated version of this boundary is found as an input line, it will be interpreted as a section-divider or end-marker. All subsequent reads will return the empty string to indicate end-of-file, until a call to pop() removes the boundary a or next() call reenables it.

It is possible to push more than one boundary. Encountering the most-recently-pushed boundary will return EOF; encountering any other boundary will raise an error.

pop(

)

Pop a section boundary. This boundary will no longer be interpreted as EOF.

section_divider(

str)

Turn a boundary into a section-divider line. By default, this method prepends '--' (which MIME section boundaries have) but it is declared so it can be overridden in derived classes. This method need not append LF or CR-LF, as comparison with the result ignores trailing whitespace.

end_marker(

str)

Turn a boundary string into an end-marker line. By default, this method prepends '--' and appends '--' (like a MIME-multipart end-of-message marker) but it is declared so it can be overridden in derived classes. This method need not append LF or CR-LF, as comparison with the result ignores trailing whitespace.

Finally, MultiFile instances have two public instance variables:

level

Nesting depth of the current part.

last

True if the last end-of-file was for an end-of-message marker.

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Python Library Reference

Previous: 12.10 multifile Up: 12.10 multifile Next: 12.10.2 MultiFile Example

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Release 2.3.4, documentation updated on May 20, 2004.