Here is my code:
import time
GLO = time.time()
def Test():
print GLO
temp = time.time();
print temp
GLO = temp
Test()
Traceback (most recent call last): File "test.py", line 11, in Test() File "test.py", line 6, in Test print GLO UnboundLocalError: local variable 'GLO' referenced before assignment
the error occurred when I add the GLO = temp, if I comment it, the function could be execute successfully, why?
How can I set GLO = temp?
Within the Test method specify that you want to refer to the globally declared GLO variable as shown below
def Test():
global GLO #tell python that you are refering to the global variable GLO declared earlier.
print GLO
temp = time.time();
print temp
GLO = temp
A similar question can be found here : Using a global variable within a method
Python looks the whole function scope first. So your GLO refers to the one below, not the global one. And refer the LEGB rule.
GLO = time.time()
def Test(glo):
print glo
temp = time.time();
print temp
return temp
GLO = Test(GLO)
or
GLO = time.time()
def Test():
global GLO
print GLO
temp = time.time();
print temp
GLO = temp
Test()
