为什么我的全球客户不全球化？

Question

I have the following lines at the beginning of my script:

global lotRow
global lotCol

Then, later on, I set lotRow and lotCol as strings using a function. Then, even later, I do the following:

getIDFromAxes(int(lotRow), int(lotCol))

This gives me:

    getIDFromAxes(str(lotRow), str(lotCol))
NameError: global name 'lotRow' is not defined

I have the def() print the "lot" strings at the end to be sure they are set, and I still can't access them for some reason.

Answer 1

global statements don't go at the beginning of a script; they go inside of a function that needs access to global variables. So rather than:

global x
x = 0

def increment_x():
    x += 1
    return x

You'll need to use:

x = 0

def increment_x():
    global x
    x += 1
    return x

Answer 2

You'll need to use the keyword global when inside the function that is trying to access your global variables, otherwise it will look for a local definition - which of course doesn't exist.

---

global global_variable

def set_var ():
  global global_variable

  global_variable = 3

def print_var ():
  global global_variable

  print int(global_variable)

set_var   ()
print_var ()

global_variable = 321

print_var ()

---

output:

3
321