print("hello world")
hello world
from ipywidgets import interact_manual
def say(what="")
    print(what)
  File "<ipython-input-4-f739797fa19c>", line 1
    def say(what="")
                    ^
SyntaxError: invalid syntax
def say(what=''):
    print(what)
@interact_manual
def say(what=''):
    print(what)
hello
\\\\\\