def components(self):
        '''The period string'''
        p = ''
        neg = self.totaldays < 0
        y = self.years
        m = self.months
        w = self.weeks
        d = self.days
        if y:
            p = '%sY' % abs(y)
        if m:
            p = '%s%sM' % (p, abs(m))
        if w:
            p = '%s%sW' % (p, abs(w))
        if d:
            p = '%s%sD' % (p, abs(d))
        return '-'+p if neg else p
def components ( self ) : p = '' neg = self . totaldays < 0 y = self . years m = self . months w = self . weeks d = self . days if y : p = '%sY' % abs ( y ) if m : p = '%s%sM' % ( p , abs ( m ) ) if w : p = '%s%sW' % ( p , abs ( w ) ) if d : p = '%s%sD' % ( p , abs ( d ) ) return '-' + p if neg else p
The period string