d={'name':'vertor','age':20} 'i am %(name)s, and %(age)s years old' % d

>>> d=dict(a=1,b=2)
>>> d
{'a': 1, 'b': 2}
>>> e={'a': 1, 'b': 2}
>>> e
{'a': 1, 'b': 2}
>>> 'a' in d
True
>>> d
{'a': 1, 'b': 2}
>>> 'i am %s ' % 'vertor'
'i am vertor '
>>> d={'name':'vertor','age'=20}
  File "<stdin>", line 1
    d={'name':'vertor','age'=20}
                            ^
SyntaxError: invalid syntax
>>> d={'name':'vertor','age':20}
>>> 'i am %(name)s, and %(age)s years old' % d
'i am vertor, and 20 years old'
>>>