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Python dictionary get value of specific key

James Gallagher is a self-taught programmer and the technical content manager at Career Karma. He has experience in range of programming languages and extensive expertise in Python, HTML, CSS, and JavaScript. James has written hundreds of programming tutorials, and he frequently contributes to publications like Codecademy, Treehouse, Repl.it, Afrotech, and others. He also serves as a

researcher at Career Karma, publishing comprehensive reports on the bootcamp market and income share agreements. Read more Comments (0) What is the dict.get() method? As already mentioned the get method contains an additional parameter which indicates the missing value. From the documentation get(key[, default]) Return the value for key if key is in the dictionary, else default. If default is not

given, it defaults to None, so that this method never raises a KeyError. An example can be >>> d = {1:2,2:3} >>> d[1] 2 >>> d.get(1) 2 >>> d.get(3) >>> repr(d.get(3)) 'None' >>> d.get(3,1) 1 Are there speed improvements anywhere? As mentioned here, It seems that all three approaches now exhibit similar performance (within about 10% of each other), more or less independent of the properties of the list of

words. Earlier get was considerably slower, However now the speed is almost comparable along with the additional advantage of returning the default value. But to clear all our queries, we can test on a fairly large list (Note that the test includes looking up all the valid keys only) def getway(d): for i in range(100): s = d.get(i) def lookup(d): for i in range(100): s = d[i] Now timing these two functions using timeit

>>> import timeit >>> print(timeit.timeit("getway({i:i for i in range(100)})","from __main__ import getway")) 20.2124660015 >>> print(timeit.timeit("lookup({i:i for i in range(100)})","from __main__ import lookup")) 16.16223979 As we can see the lookup is faster than the get as there is no function lookup. This can be seen through dis >>> def lookup(d,val): ... return d[val] ... >>> def getway(d,val): ... return

d.get(val) ... >>> dis.dis(getway) 2 0 LOAD_FAST 0 (d) 3 LOAD_ATTR 0 (get) 6 LOAD_FAST 1 (val) 9 CALL_FUNCTION 1 12 RETURN_VALUE >>> dis.dis(lookup) 2 0 LOAD_FAST 0 (d) 3 LOAD_FAST 1 (val) 6 BINARY_SUBSCR 7 RETURN_VALUE Where will it be useful? It will be useful whenever you want to provide a default value whenever you are looking up a dictionary. This reduces if key in dic:

val = dic[key] else: val = def_val To a single line, val = dic.get(key,def_val) Where will it be NOT useful? Whenever you want to return a KeyError stating that the particular key is not available. Returning a default value also carries the risk that a particular default value may be a key too! Is it possible to have get like feature in dict['key']? Yes! We need to implement the __missing__ in a dict subclass. A

sample program can be class MyDict(dict): def __missing__(self, key): return None A small demonstration can be >>> my_d = MyDict({1:2,2:3}) >>> my_d[1] 2 >>> my_d[3] >>> repr(my_d[3]) 'None' Python | Get key from value in Dictionary Let's see how to get the key by value in Python Dictionary. Method 1: Using list.index() The index() method returns index of corresponding value in a list. Below is an

implementation how to use index() method to fetch Dictionary key using value. my_dict ={"java":100, "python":112, "c":11} key_list = list(my_dict.keys()) val_list = list(my_dict.values()) position = val_list.index(100) print(key_list[position]) position = val_list.index(112) print(key_list[position]) print(list(my_dict.keys())[list(my_dict.values()).index(112)]) Output: java python python Explanation: The approach

used here is to find two separate lists of keys and values. Then fetch the key using the position of the value in the val_list. As key at any position N in key_list will have corresponding value at position N in val_list. Method #2: Using dict.item() We can also fetch key from a value by matching all the values and then print the corresponding key to given value. def get_key(val): for key, value in

my_dict.items():

if val == value:

return key return "key doesn't exist" my_dict ={"java":100, "python":112, "c":11} print(get_key(100)) print(get_key(11)) Attention geek! Strengthen your foundations with the Python Programming Foundation Course and learn the basics. To begin with, your interview preparations Enhance your Data Structures concepts with the Python DS Course. Python |

Extract specific keys from dictionary We have a lot of variations and applications of dictionary container in Python and sometimes, we wish to perform a filter of keys in dictionary, i.e extracting just the keys which are present in particular container. Let's discuss certain ways in which this can be performed. Method #1 : Using dictionary comprehension + items() This problem can be performed by

reconstruction using the keys extracted through items function that wish to be filtered and dictionary function makes the desired dictionary. test_dict = {'nikhil' : 1, "akash" : 2, 'akshat' : 3, 'manjeet' : 4} print("The original dictionary : " + str(test_dict)) res = {key: test_dict[key] for key in test_dict.keys()

& {'akshat', 'nikhil'}} print("The filtered dictionary is : " + str(res)) Output : The original

dictionary : {'manjeet': 4, 'akshat': 3, 'akash': 2, 'nikhil': 1} The filtered dictionary is : {'akshat': 3, 'nikhil': 1} Method #2 : Using dict() The dict function can be used to perform this task by converting the logic performed using list comprehension into a dictionary. test_dict = {'nikhil' : 1, "akash" : 2, 'akshat' : 3, 'manjeet' : 4} print("The original dictionary : " + str(test_dict)) res = dict((k, test_dict[k]) for k in ['nikhil',

'akshat']

if k in test_dict) print("The filtered dictionary is : " + str(res)) Output : The original dictionary : {'manjeet': 4, 'akshat': 3, 'akash': 2, 'nikhil': 1} The filtered dictionary is : {'akshat': 3, 'nikhil': 1} Attention geek! Strengthen your foundations with the Python Programming Foundation Course and learn the basics. To begin with, your interview preparations Enhance your Data

Structures concepts with the Python DS Course. Python | Get specific keys' values Sometimes, we require all the values, but many times, we have specified keys of whose value list we require. This is quite common problem for web development. Let's discuss certain ways in which this problem can be solved. Method #1 : Using list comprehension This task can be performed using list comprehension

adopted as the shorter way to perform the longer task of checking using loop. This offers a one liner approach to solve this problem. test_dict = {'gfg' : 1, 'is' : 2, 'best' : 3} filt_keys = ['gfg', 'best'] print("The original dictionary is : " + str(test_dict)) res = [test_dict[key] for key in filt_keys] print("Filtered value list is : " + str(res)) Output : The original dictionary is : {'is': 2, 'best': 3, 'gfg': 1} Filtered value list is : [1, 3]

Method #2 : Using map() + get() The combination of above functions can offer a more compact solution for this task. The map function can be used to extend the logic to whole dictionary and get function is used to fetch key's value. test_dict = {'gfg' : 1, 'is' : 2, 'best' : 3} filt_keys = ['gfg', 'best'] print("The original dictionary is : " + str(test_dict)) res = list(map(test_dict.get, filt_keys)) print("Filtered value list is : "

+ str(res)) Output : The original dictionary is : {'is': 2, 'best': 3, 'gfg': 1} Filtered value list is : [1, 3] Attention geek! Strengthen your foundations with the Python Programming Foundation Course and learn the basics. To begin with, your interview preparations Enhance your Data Structures concepts with the Python DS Course. Python | Get values of particular key in list of dictionaries Sometimes, we may

require a way in which we have to get all the values of specific key from a list of dictionary. This kind of problem has a lot of application in web development domain in which we sometimes have a json and require just to get single column from records. Let's discuss certain ways in which this problem can be solved. Method #1 : Using list comprehension Using list comprehension is quite straight forward

method to perform this particular task. In this, we just iterate over the list of dictionary for desired value. test_list = [{'gfg' : 1, 'is' : 2, 'good' : 3},

{'gfg' : 2}, {'best' : 3, 'gfg' : 4}] print("The original list is : " + str(test_list)) res = [ sub['gfg'] for sub in test_list ] print("The values corresponding to key : " + str(res)) Output : The original list is : [{`is': 2, `gfg': 1, `good': 3}, {`gfg': 2}, {`best': 3, `gfg': 4}] The values

corresponding to key : [1, 2, 4] Method #2 : Using map() + itemgetter() This problem can also be solved using another technique using map() and itemgetter(). In this, map is used to link the value to all the dictionary keys and itemgetter gets the desired key. from operator import itemgetter test_list = [{'gfg' : 1, 'is' : 2, 'good' : 3},

{'gfg' : 2}, {'best' : 3, 'gfg' : 4}] print("The original list is : " + str(test_list))

res = list(map(itemgetter('gfg'), test_list)) print("The values corresponding to key : " + str(res)) Output : The original list is : [{`is': 2, `gfg': 1, `good': 3}, {`gfg': 2}, {`best': 3, `gfg': 4}] The values corresponding to key : [1, 2, 4] Attention geek! Strengthen your foundations with the Python Programming Foundation Course and learn the basics. To begin with, your interview preparations Enhance your Data Structures

concepts with the Python DS Course.

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