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Python – Filter dictionaries with ordered values

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  • Last Updated : 02 Dec, 2020

Given the dictionary list, the task is to write a python program to filter dictionaries with values in increasing order i.e sorted.

Examples:

Input : test_list = [{‘gfg’ : 2, ‘is’ : 8, ‘good’ : 10}, {‘gfg’ : 1, ‘for’ : 10, ‘geeks’ : 9}, {‘love’ : 3, ‘gfg’ : 4}] 
Output : [{‘gfg’: 2, ‘is’: 8, ‘good’: 10}, {‘love’: 3, ‘gfg’: 4}] 
Explanation : 2, 8, 10 are in increasing order.
 

Input : test_list = [{‘gfg’ : 2, ‘is’ : 8, ‘good’ : 10}, {‘gfg’ : 1, ‘for’ : 10, ‘geeks’ : 9}, {‘love’ : 4, ‘gfg’ : 3}] 
Output : [{‘gfg’: 2, ‘is’: 8, ‘good’: 10}] 
Explanation : 2, 8, 10 are in increasing order. 

Method #1 : Using sorted() + values() + list comprehension

In this, we perform task of sorting using sorted() and extract values using values(), list comprehension is used to perform iteration of all the dictionaries.

Python3




# Python3 code to demonstrate working of
# Filter dictionaries with ordered values
# Using sorted() + values() + list comprehension
  
# initializing list
test_list = [{'gfg': 2, 'is': 8, 'good': 10},
             {'gfg': 1, 'for': 10, 'geeks': 9},
             {'love': 3, 'gfg': 4}]
  
# printing original list
print("The original list is : " + str(test_list))
  
# sorted to check with ordered values
# values() extracting dictionary values
res = [sub for sub in test_list if sorted(
    list(sub.values())) == list(sub.values())]
  
# printing result
print("The filtered Dictionaries : " + str(res))

Output:

The original list is : [{‘gfg’: 2, ‘is’: 8, ‘good’: 10}, {‘gfg’: 1, ‘for’: 10, ‘geeks’: 9}, {‘love’: 3, ‘gfg’: 4}]
The filtered Dictionaries : [{‘gfg’: 2, ‘is’: 8, ‘good’: 10}, {‘love’: 3, ‘gfg’: 4}]

Method #2 : Using filter() + lambda + sorted()

In this, we perform task of filtering using filter(), and lambda function is used to perform task of injecting functionality necessary for checking increasing values.

Python3




# Python3 code to demonstrate working of
# Filter dictionaries with ordered values
# Using filter() + lambda + sorted()
  
# initializing list
test_list = [{'gfg': 2, 'is': 8, 'good': 10},
             {'gfg': 1, 'for': 10, 'geeks': 9},
             {'love': 3, 'gfg': 4}]
  
# printing original list
print("The original list is : " + str(test_list))
  
# sorted to check with ordered values
# values() extracting dictionary values
# filter() and lambda function used to filter
res = list(filter(lambda sub: sorted(list(sub.values()))
                  == list(sub.values()), test_list))
  
# printing result
print("The filtered Dictionaries : " + str(res))

Output:

The original list is : [{‘gfg’: 2, ‘is’: 8, ‘good’: 10}, {‘gfg’: 1, ‘for’: 10, ‘geeks’: 9}, {‘love’: 3, ‘gfg’: 4}]
The filtered Dictionaries : [{‘gfg’: 2, ‘is’: 8, ‘good’: 10}, {‘love’: 3, ‘gfg’: 4}]


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