openpyxl.utils.escape module

OOXML has non-standard escaping for characters < 

openpyxl.utils.escape.escape(value)

Convert ASCII < 31 to OOXML: n == _x + hex(ord(n)) + _

openpyxl.utils.escape.unescape(value)

Convert escaped strings to ASCIII: _x000a_ == n