Python - Ways to remove a key from dictionary

PythonServer Side ProgrammingProgramming

Dictionary is used in manifold practical applications such as day-day programming, web development and AI/ML programming as well, making it a useful container overall. Hence, knowing the ways for achieving different tasks related to dictionary usage always is a plus.

Example

# using del
# Initializing dictionary
test_dict = {"Vishesh" : 29, "Ram" : 21, "Vishal" : 27, "Prashant" : 25}
# Printing dictionary before removal
print ("The dictionary before performing remove is : " + str(test_dict))
# Using del to remove a dict
del test_dict['Vishal']
# Printing dictionary after removal
print ("The dictionary after remove is : " + str(test_dict))
# using pop()
# Initializing dictionary
test_dict = {"Vishesh" : 29, "Ram" : 21, "Vishal" : 27, "Prashant" : 25}  
# Printing dictionary before removal
print ("The dictionary before performing remove is : " + str(test_dict))
# Using pop() to remove a dict. pair
removed_value = test_dict.pop('Ram')
# Printing dictionary after removal
print ("The dictionary after remove is : " + str(test_dict))
print ("The removed key's value is : " + str(removed_value))  
# Using pop() to remove a dict. pair doesn't raise exception
# assigns 'No Key found' to removed_value
removed_value = test_dict.pop('Nilesh', 'No Key found')  
# Printing dictionary after removal
print ("The dictionary after remove is : " + str(test_dict))
print ("The removed key's value is : " + str(removed_value))
# using items() + dict comprehension  
# Initializing dictionary
test_dict = {"Vishesh" : 29, "Ram" : 21, "Vishal" : 27, "Prashant" : 25}  
# Printing dictionary before removal
print ("The dictionary before performing remove is : " + str(test_dict))  
# Using items() + dict comprehension to remove a dict. pair
new_dict = {key:val for key, val in test_dict.items() if key != 'Prashant}
# Printing dictionary after removal
print ("The dictionary after remove is : " + str(new_dict))
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raja
Published on 06-Aug-2020 14:29:12
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