minifier gives invalid output

[Drulludanni]

from time import time
class Class():
    def __init__(self, parent = None):
        self.asdf = time()

if __name__ == '__main__':
    c = Class()

gets converted to

from z import time
o=None
class J():
 def __init__(n,parent=o):
  n.asdf=z()
if __name__=='__main__':
 c=J()

which is clearly wrong since z is never defined, in this case it should minify to from time import time as z then the code would run as expected