[py] inconsistent highlighting

[takamori]

class Class:
  field1 = 0
  field2: str = "example"

def func():
  var2: int = 0
  var2 = 10 + var2
  var1 = 0
  var1 = 10 + var1

def func2():
  var1 = 0
  var1 = 10 + var1
  var2: int = 0
  var2 = 10 + var2

global_var1 = True
global_var2: bool = False