Python Remove Dictionary Key/Value Pairs
Python3 ExamplesGiven a dictionary, remove the key/value pairs from the dictionary.
Example 1: Using del to remove
test_dict = {"Example" : 1, "Google" : 2, "Taobao" : 3, "Zhihu" : 4}
# Output the original dictionary
print ("Before dictionary removal:" + str(test_dict))
# Use del to remove Zhihu
del test_dict['Zhihu']
# Output the dictionary after removal
print ("After dictionary removal:" + str(test_dict))
# Removing a non-existent key will cause an error
#del test_dict['Baidu']
Executing the above code produces the following output:
字典移除前 : {'Example': 1, 'Google': 2, 'Taobao': 3, 'Zhihu': 4}
字典移除后 : {'Example': 1, 'Google': 2, 'Taobao': 3}
Example 2: Using pop() to remove
test_dict = {"Example" : 1, "Google" : 2, "Taobao" : 3, "Zhihu" : 4}
# Output the original dictionary
print ("Before dictionary removal:" + str(test_dict))
# Use pop to remove Zhihu
removed_value = test_dict.pop('Zhihu')
# Output the dictionary after removal
print ("After dictionary removal:" + str(test_dict))
print ("The value corresponding to the removed key is:" + str(removed_value))
print ('\r')
# Using pop() to remove a non-existent key will not cause an exception; we can customize the prompt message
removed_value = test_dict.pop('Baidu', 'No such key')
# Output the dictionary after removal
print ("After dictionary removal:" + str(test_dict))
print ("The removed value is:" + str(removed_value))
Executing the above code produces the following output:
字典移除前 : {'Example': 1, 'Google': 2, 'Taobao': 3, 'Zhihu': 4}
字典移除后 : {'Example': 1, 'Google': 2, 'Taobao': 3}
移除的 key 对应的 value 为 : 4
字典移除后 : {'Example': 1, 'Google': 2, 'Taobao': 3}
移除的值为 : 没有该键(key)
Example 3: Using items() to remove
test_dict = {"Example" : 1, "Google" : 2, "Taobao" : 3, "Zhihu" : 4}
# Output the original dictionary
print ("Before dictionary removal:" + str(test_dict))
# Use pop to remove Zhihu
new_dict = {key:val for key, val in test_dict.items() if key != 'Zhihu'}
# Output the dictionary after removal
print ("After dictionary removal:" + str(new_dict))
Executing the above code produces the following output:
字典移除前 : {'Example': 1, 'Google': 2, 'Taobao': 3, 'Zhihu': 4}
字典移除后 : {'Example': 1, 'Google': 2, 'Taobao': 3}
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