Python - Dictionary items in value range

Python – Dictionary items in value range

Last Updated : 01 Aug, 2020

Given a range of values, extract all the items whose keys lie in range of values.

Input : {‘Gfg’ : 6, ‘is’ : 7, ‘best’ : 9, ‘for’ : 8, ‘geeks’ : 11}, i, j = 9, 12
Output : {‘best’ : 9, ‘geeks’ : 11}
Explanation : Keys within 9 and 11 range extracted.
Input : {‘Gfg’ : 6, ‘is’ : 7, ‘best’ : 9, ‘for’ : 8, ‘geeks’ : 11}, i, j = 14, 18
Output : {}
Explanation : No values in range.

Method #1 : Using loop

This is brute way in which this task can be performed. In this, we run a loop for all the keys with conditional checks for range of values.

Python3

# Python3 code to demonstrate working of 
# Dictionary items in value range
# Using loop
  
# initializing dictionary
test_dict = {'Gfg' : 6, 'is' : 7, 'best' : 9, 'for' : 8, 'geeks' : 11} 
  
# printing original dictionary
print("The original dictionary is : " + str(test_dict))
  
# initializing range 
i, j = 8, 12
  
# using loop to iterate through all keys
res = dict()
for key, val in test_dict.items():
    if int(val) >= i and int(val) <= j:
        res[key] = val
  
# printing result 
print("The extracted dictionary : " + str(res)) 

Output

The original dictionary is : {'Gfg': 6, 'is': 7, 'best': 9, 'for': 8, 'geeks': 11}
The extracted dictionary : {'best': 9, 'for': 8, 'geeks': 11}

Method #2 : Using filter() + lambda + dictionary comprehension

The combination of above functions can be used to solve this problem. In this, we perform task of filtering using filter() and lambda is used for conditional checks.

Python3

# Python3 code to demonstrate working of 
# Dictionary items in value range
# Using filter() + lambda + dictionary comprehension 
  
# initializing dictionary
test_dict = {'Gfg' : 6, 'is' : 7, 'best' : 9, 'for' : 8, 'geeks' : 11} 
  
# printing original dictionary
print("The original dictionary is : " + str(test_dict))
  
# initializing range 
i, j = 8, 12
  
# using dictionary comprehension to compile result in one 
res = {key: val for key, val in filter(lambda sub: int(sub[1]) >= i and
                                   int(sub[1]) <= j, test_dict.items())}
  
# printing result 
print("The extracted dictionary : " + str(res)) 

Output

The original dictionary is : {'Gfg': 6, 'is': 7, 'best': 9, 'for': 8, 'geeks': 11}
The extracted dictionary : {'best': 9, 'for': 8, 'geeks': 11}

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