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Python | Filter the negative values from given dictionary
  • Last Updated : 01 Mar, 2019

Given a dictionary, the task is to filter all the negative values from given dictionary. Let’s discuss few methods to do this task.

Method #1: Using dict comprehension

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# Python code to demonstrate
# return the filtered dictionary
# on certain criteria
  
from six import iteritems
# Initialising dictionary
ini_dict = {'a':1, 'b':-2, 'c':-3, 'd':7, 'e':0}
  
# printing initial dictionary
print ("initial lists", str(ini_dict))
  
# filter dictionary such that no value is greater than 0
result = dict((k, v) for k, v in ini_dict.items() if v >= 0)
  
print("resultant dictionary : ", str(result))

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Output:

initial lists {'a': 1, 'c': -3, 'd': 7, 'b': -2, 'e': 0}
resultant dictionary :  {'a': 1, 'd': 7, 'e': 0}

 
Method #2: Using lambda and filter

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# Python code to demonstrate
# return the filtered dictionary
# on certain criteria
  
from six import iteritems
# Initialising dictionary
ini_dict = {'a':1, 'b':-2, 'c':-3, 'd':7, 'e':0}
  
# printing initial dictionary
print ("initial lists", str(ini_dict))
  
# filter dictionary such that no value is greater than 0
result = dict(filter(lambda x: x[1] >= 0.0, ini_dict.items()))
result = dict(result)
  
print("resultant dictionary : ", str(result))

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Output:

initial lists {'c': -3, 'd': 7, 'e': 0, 'a': 1, 'b': -2}
resultant dictionary :  {'e': 0, 'a': 1, 'd': 7}

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