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Python – Find Keys with specific suffix in Dictionary

  • Last Updated : 17 Dec, 2019

Sometimes, while working with dictionaries, we can have a problem in which we need to find the dictionary items that have some constraints on keys. One such constraint can be a suffix match on keys. Let’s discuss certain ways in which this task can be performed.

Method #1 : Using dictionary comprehension + endswith()
The combination of above two methods can be used to perform this particular task. In this, dictionary comprehension does the basic task of dictionary construction and endswith() performs the utility task of checking keys starting with specific suffix.




# Python3 code to demonstrate working of
# Keys with specific suffix in Dictionary
# Using dictionary comprehension + endswith()
  
# Initialize dictionary
test_dict = {'all' : 4, 'geeks' : 5, 'are' : 8, 'freaks' : 10}
  
# printing original dictionary
print("The original dictionary : " + str(test_dict))
  
# Initialize suffix
test_suf = 'ks'
  
# Using dictionary comprehension + endswith()
# Keys with specific suffix in Dictionary
res = {key:val for key, val in test_dict.items() if key.endswith(test_suf)}
  
# printing result 
print("Filtered dictionary keys are : " + str(res))
Output :
The original dictionary : {'geeks': 5, 'freaks': 10, 'are': 8, 'all': 4}
Filtered dictionary keys are : {'geeks': 5, 'freaks': 10}

 

Method #2 : Using map() + filter() + items() + endswith()
This particular task can also be performed using the combination of above functions. The map function ties the filter logic of endswith() to each dictionary’s items extracted by items().




# Python3 code to demonstrate working of
# Keys with specific suffix in Dictionary
# Using map() + filter() + items() + endswith()
  
# Initialize dictionary
test_dict = {'all' : 4, 'geeks' : 5, 'are' : 8, 'freaks' : 10}
  
# printing original dictionary
print("The original dictionary : " + str(test_dict))
  
# Initialize suffix 
test_suf = 'ks'
  
# Using map() + filter() + items() + endswith()
# Keys with specific suffix in Dictionary
res = dict(filter(lambda item: item[0].endswith(test_suf), test_dict.items()))
  
# printing result 
print("Filtered dictionary keys are : " + str(res))
Output :
The original dictionary : {'geeks': 5, 'freaks': 10, 'are': 8, 'all': 4}
Filtered dictionary keys are : {'geeks': 5, 'freaks': 10}

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