Re: return respective values when mutiple keys are passed in dictionary
Thanks Arnaud
List comprehension method really works nicely.sorry for late reply.
On Mon, May 7, 2012 at 7:10 PM, Arnaud Delobelle arno...@gmail.com wrote:
On 7 May 2012 12:31, Nikhil Verma varma.nikhi...@gmail.com wrote:
HI All
I was clearing my concepts on dictionary and stuck in this problem.
I have a dictionary which i have formed by using zip function on two
list so
that one list (which i have hardcoded) becomes the keys and the other
list
becomes its values.
Now i want to know how can i get the values of keys at once if i pass the
keys in a dictionary.
Let say I have a dictionary
mydict = {'a':'apple' , 'b':'boy' ,'c' : 'cat', 'd':'duck','e':'egg'}
Now if i do :-
mydict.get('a')
'apple'
mydict['a'] is the usual way to get the value associated with a key.
The difference is that it will throw an exception if the key doesn't
exist, which is most of the time the sanest thing to do.
What i want is some i pass keys in get and in return i should have all
the
values of those keys which i pass.
##
mydict.get('a','b','c')###demo for what i want
'apple','boy','cat'### Output i want
#
1. You can use a list comprehension
[mydict[k] for k in 'a', 'b', 'c']
['apple', 'boy', 'cat']
2. You can use map (for python 3.X, you need to wrap this in list(...))
map(mydict.__getitem__, ['a', 'b', 'c'])
['apple', 'boy', 'cat']
3. You can use operator.itemgetter
from operator import itemgetter
itemgetter('a', 'b', 'c')(mydict)
('apple', 'boy', 'cat')
--
Arnaud
--
Regards
Nikhil Verma
+91-958-273-3156
--
http://mail.python.org/mailman/listinfo/python-list
return respective values when mutiple keys are passed in dictionary
HI All
I was clearing my concepts on dictionary and stuck in this problem.
I have a dictionary which i have formed by using zip function on two list
so that one list (which i have hardcoded) becomes the keys and the other
list
becomes its values.
Now i want to know how can i get the values of keys at once if i pass the
keys in a dictionary.
Let say I have a dictionary
mydict = {'a':'apple' , 'b':'boy' ,'c' : 'cat', 'd':'duck','e':'egg'}
Now if i do :-
mydict.get('a')
'apple'
What i want is some i pass keys in get and in return i should have all the
values of those keys which i pass.
##
mydict.get('a','b','c')###demo for what i want
'apple','boy','cat'### Output i want
#
--
Regards
Nikhil Verma
+91-958-273-3156
--
http://mail.python.org/mailman/listinfo/python-list
Re: return respective values when mutiple keys are passed in dictionary
You can try to use map(mydict.get, ('a', 'b', 'c')) and then make join
On May 7, 2012 2:33 PM, Nikhil Verma varma.nikhi...@gmail.com wrote:
HI All
I was clearing my concepts on dictionary and stuck in this problem.
I have a dictionary which i have formed by using zip function on two list
so that one list (which i have hardcoded) becomes the keys and the other
list
becomes its values.
Now i want to know how can i get the values of keys at once if i pass the
keys in a dictionary.
Let say I have a dictionary
mydict = {'a':'apple' , 'b':'boy' ,'c' : 'cat', 'd':'duck','e':'egg'}
Now if i do :-
mydict.get('a')
'apple'
What i want is some i pass keys in get and in return i should have all the
values of those keys which i pass.
##
mydict.get('a','b','c')###demo for what i want
'apple','boy','cat'### Output i want
#
--
Regards
Nikhil Verma
+91-958-273-3156
--
http://mail.python.org/mailman/listinfo/python-list
--
http://mail.python.org/mailman/listinfo/python-list
Re: return respective values when mutiple keys are passed in dictionary
On Mon, May 7, 2012 at 9:31 PM, Nikhil Verma varma.nikhi...@gmail.com wrote:
mydict = {'a':'apple' , 'b':'boy' ,'c' : 'cat', 'd':'duck','e':'egg'}
Now if i do :-
mydict.get('a')
'apple'
What i want is some i pass keys in get and in return i should have all the
values of those keys which i pass.
##
mydict.get('a','b','c') ###demo for what i want
'apple','boy','cat' ### Output i want
#
Presumably you want to get back a list or tuple, so a list
comprehension is your best bet.
[mydict.get(i) for i in ('a','b','c')]
Incidentally, are you aware that dictionaries can be subscripted? The
get() method is good when you want a default value for anything that
doesn't exist, otherwise you can simply use:
mydict['a']
ChrisA
--
http://mail.python.org/mailman/listinfo/python-list
Re: return respective values when mutiple keys are passed in dictionary
On 7 May 2012 12:31, Nikhil Verma varma.nikhi...@gmail.com wrote:
HI All
I was clearing my concepts on dictionary and stuck in this problem.
I have a dictionary which i have formed by using zip function on two list so
that one list (which i have hardcoded) becomes the keys and the other list
becomes its values.
Now i want to know how can i get the values of keys at once if i pass the
keys in a dictionary.
Let say I have a dictionary
mydict = {'a':'apple' , 'b':'boy' ,'c' : 'cat', 'd':'duck','e':'egg'}
Now if i do :-
mydict.get('a')
'apple'
mydict['a'] is the usual way to get the value associated with a key.
The difference is that it will throw an exception if the key doesn't
exist, which is most of the time the sanest thing to do.
What i want is some i pass keys in get and in return i should have all the
values of those keys which i pass.
##
mydict.get('a','b','c') ###demo for what i want
'apple','boy','cat' ### Output i want
#
1. You can use a list comprehension
[mydict[k] for k in 'a', 'b', 'c']
['apple', 'boy', 'cat']
2. You can use map (for python 3.X, you need to wrap this in list(...))
map(mydict.__getitem__, ['a', 'b', 'c'])
['apple', 'boy', 'cat']
3. You can use operator.itemgetter
from operator import itemgetter
itemgetter('a', 'b', 'c')(mydict)
('apple', 'boy', 'cat')
--
Arnaud
--
http://mail.python.org/mailman/listinfo/python-list
