This is called imperative programming:
for it in x:
... if it.strip() != '':
... print ("Ok")This is called functional programming: >>> [y for y in x if y.strip() != ''] ['x1', 'x2', 'x3'] What you have is a confusion: print is imperative comprehension is functional You should not mix them like that -- https://mail.python.org/mailman/listinfo/python-list
