def leaveWhitespace( self ):
        self.skipWhitespace = False
        self.exprs = [ e.copy() for e in self.exprs ]
        for e in self.exprs:
            e.leaveWhitespace()
        return self
Extends C{leaveWhitespace} defined in base class, and also invokes C{leaveWhitespace} on
dataset/ETHPy150Open pypa/pip/pip/_vendor/pyparsing.py/ParseExpression.leaveWhitespace