Python range function

Question

Say I want to loop from 0 to 100 but with a step of 1/2. If you try

for i in range(0, 100, 0.5):
    whatever
         


        

Answer 1

For large ranges it is better to use an generator expression than building a list explicitly:

 for k in ( i*0.5 for i in range(200) ):
     print k

This consumes not much extra memory, is fast und easy to read. See http://docs.python.org/tutorial/classes.html#generator-expressions