for loop interger

Coding Python Support
1

it seems that the for loop need to have integer arguments

is there another one where we can have a sep value like 0.1 which is not integer value

like for j in range ( 10.2 , 50, 5.5)

or what else should i use instead?

Thanks

2

Here’s a really quick hack for float_range I just coded for fun:


def float_range(min, max, step=1.0):
    ret = []
    
    amount_of_values = (max-min) / step
    step_amount = (max-min) / amount_of_values
    
    for i in range(amount_of_values):
        ret.append(min + step_amount * i)
    
    return ret

for i in float_range(10.2, 50, 5.5):
    print i

You can find another, perhaps more comprehensive implementation at http://code.activestate.com/recipes/66472/ .

3

What about this…


j = 1
j_end = 10
j_step = 0.5
while j < j_end:
 j = j + j_step
 print j
4

Another way (must have at least Python 2.3 or 2.4 (can’t recall when yield became a standard keyword)):


def frange(min, max, step = 1.0):
     while min < max:
          min += step
          yield min

It doesn’t check for error values or anything, but that should be easy to add…

5

integers are nice but sometimes you deal with real numbers!

but is are the min and max again limited to integer

let say that i have a loop that is function of angles

let say from minang = 100.5 degrees to a max of 210.8 degrees

and i want to step with an increment of 1.1 degree
is the for loop able to deal with that of if i have to make an independant set of variables inside to deal with it ?

or may be the while loop is easier to deal with this kind of situtation

Thanks

6

I don’t think it matters as long as you don’t clobber your variables inside the loop.