Question

I am trying to generate a random three digit extension:

>>>  ''.join(str(x) for x in random.sample(range(1,10),3))

It works in the prompt. However, when I run the program, it raises a TypeError: str object is not callable. This is the line that I have:

    filename = hashlib.md5(imagefile.getvalue()).hexdigest() + 
              ''.join(str(x) for x in random.sample(range(1,10),3)) + '_thumb' + '.jpg'  

What am I doing wrong here and how would I fix it?

Thank you for the help. I had invoked str previously in the code, which was causing the error:

str=""
for c in i.chunks(): 
    str += c
...

Answer 1

I’ve tried it out both in the console and calling it in a .py file and both work.

Are you sure you’re not declaring a variable called “str” somewhere in your code before that invocation?

This works:

import random
filename= ''.join(str(x) for x in random.sample(range(1,10),3))
print filename

This:

import random
str = ''
filename= ''.join(str(x) for x in random.sample(range(1,10),3))
print filename

Give the same error you’re reporting.