为什么git子模块给出语法错误？

Question

git submodule add git://github.com/evernote/evernote-sdk-python/ evernote
git submodule init
git submodule update

dev_token = "#DevTokenHere"
client = EvernoteClient(token=dev_token)
userStore = client.get_user_store()
user = userStore.getUser()
print(user.username)

我从子模块部分收到语法错误，我不确定为什么