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I am trying to develop a python script that loops through a set of subdirectories I have and extracts a data file from each of those subdirectories. My subdirectories are each named for their corresponding time in a simulation I have fun earlier. However, the issue is that the integer subdirectories are listed without a decimal point (e.g. 5), while the non-integer subdirectories are listed with a decimal point. So in order to find the correct subdirectory, my loop is very sensitive to the number type.

With that, I have been trying to use the is._integer() method with python, but I keep getting this error: 

'int' object has no attribute 'is_integer'

when I run the following code:

def frange(x, y, jump):
    while x < y:
        yield x
        x += jump

time=15

for i in frange(0,time,0.1):
    float(i)    
    print (i).is_integer()

even when I am brute forcing my loop variable to be a float! Please help.

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  • and print(i.is_integer) , not print(i).is_integer Commented Mar 24, 2016 at 20:24

3 Answers 3

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Try print(float(i).is_integer())

The reason is that despite the fact that you casted i with float(i) before the usage of (i).is_integer(), it did not mutate the variable type of i to float.

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float(i)

This converts the argument i into a float, but that result is returned; it does not modify the variable i. So what that call does is simply discarded.

And in your case, in the first iteration, i is 0 which is an actual integer, and integer objects don’t have an is_integer method. So you either want to assign the restult of float(i) back to i:

for i in frange(0, time, 0.1):
    i = float(i)
    print (i).is_integer()

… or make sure that frange only returns floats:

def frange(x, y, jump):
    x = float(x)
    while x < y:
        yield x
        x += jump
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Ok, so all of these suggestions work (thank you!). However now I have made my code like this: Code' for i in frange(0,time,0.1): x = float(i) print x print (x).is_integer() Code' and the only value it is telling me I have an integer for is "0.0" and nothing else even though I am going up to a time of 15 with increments of 0.1. Thoughts?
That’s because it’s floating point arithmetic, see this question.
But the reason I am using .is_integer() is because I thought it worked with floating point arithmetic
It works, but only if the number is exactly e.g. 1.00000000000000. But that’s unlikey due to how floating point arithmetic works.
Hmmm... do you have any other suggestions as to how I can do this?
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You do not assign cast value to a variable. This should work:

def frange(x, y, jump):
    while x < y:
        yield x
        x += jump

time=15

for i in frange(0,time,0.1):
    x = float(i)    
    print (x).is_integer()
Improve this answer

1 Comment

Ok, so all of these suggestions work (thank you!). However now I have made my code like this: for i in frange(0,time,0.1): x = float(i) print x print (x).is_integer() `Code' and the only value it is telling me I have an integer for is "0.0" and nothing else even though I am going up to a time of 15 with increments of 0.1. Thoughts?

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