Python无法运行任何脚本

Question

我安装了Python 2.7.14 64位版本，但我无法运行最简单的脚本。如果我复制到Shell并从那里运行它是正常的。这是我试图运行的脚本。

def fun(a):
    print a
    return

错误消息

Exception in Tkinter callback
Traceback (most recent call last):
  File "C:\Python27\lib\lib-tk\Tkinter.py", line 1541, in __call__
    return self.func(*args)
  File "C:\Python27\lib\idlelib\MultiCall.py", line 166, in handler
    r = l[i](event)
  File "C:\Python27\lib\idlelib\ScriptBinding.py", line 149, in run_module_event

    if PyShell.use_subprocess:
AttributeError: 'module' object has no attribute 'use_subprocess'