Python 3.6.0 released(mail.python.org)

    >>> x = "My name is {name} and I am {age} years old"
    >>> x
    'My name is {name} and I am {age} years old'

    >>> x = f"My name is {name} and I am {age} years old"
    # this is an error unless name and age are defined

    def test_bar(bar):
        for foo in bar:
            if meets_some_condition(foo):
                yield transform(foo)

    do_something_with(test_bar(bar))

    i. let x = [ 1, 2, 3].map(i => i * 10)

    ii. x = list(map((lambda i: i * 10), [ 1, 2, 3 ]))

    iii. x = [i * 10 for i in [1, 2, 3]]

    for i in [1,2,3]:
        ...

    "{} world!".format('hello')

    "{greeting} world!".format(greeting='hello')

    ** no italics because we're in a code block

    >>> import dis
    >>> dis.dis('f"{foo}"')
    
        1           0 LOAD_NAME                0 (foo)
                    2 FORMAT_VALUE             0
                    4 RETURN_VALUE

    >>> import dis
    >>> dis.dis('"{foo}".format("bar")')
    
      1           0 LOAD_CONST               0 ('{foo}')
                  2 LOAD_ATTR                0 (format)
                  4 LOAD_CONST               1 ('bar')
                  6 CALL_FUNCTION            1
                  8 RETURN_VALUE

    >>> def foo():
    ...     a
    ...     a = 3
    ... 
    >>> foo()
    Traceback (most recent call last):
      File "<stdin>", line 1, in <module>
      File "<stdin>", line 2, in foo
    UnboundLocalError: local variable 'a' referenced before assignment

    >>> def foo():
    ...     a
    ... 
    >>> foo()
    Traceback (most recent call last):
      File "<stdin>", line 1, in <module>
      File "<stdin>", line 2, in foo
    NameError: name 'a' is not defined

    def add_week_to_day(d: str) -> str:
      # d arrives as an ISO string, like '2016-12-23'
      d = datetime.strptime(d, '%Y-%m-%d')
      d = d + timedelta(days=7)
      return d.strftime('%Y-%m-%d')