>>> 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'}