Python – Extract Keys with specific Value Type
Given a dictionary, extract all the keys, whose values are of given type.
Input : test_dict = {‘gfg’ : 2, ‘is’ : ‘hello’, ‘for’ : {‘1’ : 3}, ‘geeks’ : 4}, targ_type = int
Output : [‘gfg’, ‘geeks’]
Explanation : gfg and geeks have integer values.Input : test_dict = {‘gfg’ : 2, ‘is’ : ‘hello’, ‘for’ : {‘1’ : 3}, ‘geeks’ : 4}, targ_type = str
Output : [‘is’]
Explanation : is has string value.
Method #1 : Using loop + isinstance()
In this, we check for data type using isinstance(), and iterate for all the values using loop.
Python3
# Python3 code to demonstrate working of# Extract Keys with specific Value Type# Using loop + isinstance() # initializing dictionarytest_dict = {'gfg': 2, 'is': 'hello', 'best': 2, 'for': {'1': 3}, 'geeks': 4} # printing original dictionaryprint("The original dictionary is : " + str(test_dict)) # initializing typetarg_type = int res = []for key, val in test_dict.items(): # checking for values datatype if isinstance(val, targ_type): res.append(key) # printing resultprint("The extracted keys : " + str(res)) |
Output:
The original dictionary is : {‘gfg’: 2, ‘is’: ‘hello’, ‘best’: 2, ‘for’: {‘1’: 3}, ‘geeks’: 4}
The extracted keys : [‘gfg’, ‘best’, ‘geeks’]
Method #2 : Using list comprehension + isinstance()
Similar to above method, one-liner shorthand to solve this problem using list comprehension.
Python3
# Python3 code to demonstrate working of# Extract Keys with specific Value Type# Using list comprehension + isinstance() # initializing dictionarytest_dict = {'gfg': 2, 'is': 'hello', 'best': 2, 'for': {'1': 3}, 'geeks': 4} # printing original dictionaryprint("The original dictionary is : " + str(test_dict)) # initializing typetarg_type = int # one-liner to solve the problemres = [key for key, val in test_dict.items() if isinstance(val, targ_type)] # printing resultprint("The extracted keys : " + str(res)) |
Output:
The original dictionary is : {‘gfg’: 2, ‘is’: ‘hello’, ‘best’: 2, ‘for’: {‘1’: 3}, ‘geeks’: 4}
The extracted keys : [‘gfg’, ‘best’, ‘geeks’]
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