Use "yield from" in expr.py
Use "yield from" in expr.py

GtTmy/pyeda,karissa/pyeda,cjdrake/pyeda,pombredanne/pyeda,GtTmy/pyeda,sschnug/pyeda,karissa/pyeda,sschnug/pyeda,GtTmy/pyeda,pombredanne/pyeda,cjdrake/pyeda,pombredanne/pyeda,cjdrake/pyeda,sschnug/pyeda,karissa/pyeda