Updating a variable problem.

[Steve]

Why should line 6 fail until line 7 is commented out?
Python complains that MSN is "referenced before assignment".

def ReadTheEQfile():
  global MSN
  MSN = ("1 Monitor") #This line works every time.
    
def EditTheEQlist():
  print("MSN2 = " + MSN) # Works if the next line is commented out.
  MSN = ("3 Monitor")
        
# Main()
ReadTheEQfile()
print("MSN1 = " + MSN) # This line works every time
EditTheEQlist()



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