> d={'name':'Allen','age':21,'gender':'male'}
> d
{'age': 21, 'name': 'Allen', 'gender': 'male'}

> d={}
> d['name']='Allen'
> d['age']=21
> d['gender']='male'
> d
{'age': 21, 'name': 'Allen', 'gender': 'male'}

> d[1]='abcd'
> d
{1: 'abcd', 'age': 21, 'name': 'Allen', 'gender': 'male'}
> d[2]
Traceback (most recent call last):
 File "<pyshell#9>", line 1, in <module>
  d[2]
KeyError: 2

> c = dict(name='Allen', age=14, gender='male')
> c
{'gender': 'male', 'name': 'Allen', 'age': 14}

> c = dict(name='Allen', age=14, gender='male', 1='abcd')
SyntaxError: keyword can't be an expression

> e=dict([('name','Allen'),('age',21),('gender','male')])
> e
{'age': 21, 'name': 'Allen', 'gender': 'male'}

> f=dict.fromkeys(['height','weight'],'normal')
> f
{'weight': 'normal', 'height': 'normal'}