I want to assign a local variable, "length" in "main()", to the value returned by another funcion. Yet, while I am assigning the variable, IDLE tells me that I am referencing it before assigning it. How do I assign this local variable such that it doesn't cause an error?
import random
def length():
return 2
def main():
length = length()
index = random.randrange(0, length)
main()
I expected to assign "length" to "2" by referencing length(). It seems to me that "length = length()" is a straightforward, correct assignment.
The IDLE traceback is:
Traceback (most recent call last):
File "/home/user/code/test1.py", line 10, in <module>
main()
File "/home/user/code/test1.py", line 7, in main
length = length()
UnboundLocalError: local variable 'length' referenced before assignment
length
is either a local variable containing an integer, or global variable referring to the function. It can't be both. As soon as you assign to it, it's a local variable throughout the function, and therefore there is no reference to the length function any more.
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.