Dictionary Methods in Python | Set 1 (cmp(), len(), items()…)

Difficulty Level : Easy
Last Updated : 28 Jun, 2021

Python Dictionary Basics have been discussed in the article below

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Some dictionary methods are discussed in this article.

1. str(dic) :- This method is used to return the string, denoting all the dictionary keys with their values.

2. items() :- This method is used to return the list with all dictionary keys with values.

# Python code to demonstrate working of
# str() and items()
  
# Initializing dictionary
dic = { 'Name' : 'Nandini', 'Age' : 19 }
  
# using str() to display dic as string
print ("The constituents of dictionary as string are : ")
print (str(dic))
  
# using str() to display dic as list
print ("The constituents of dictionary as list are : ")
print (dic.items())

Output:

The constituents of dictionary as string are : 
{'Name': 'Nandini', 'Age': 19}
The constituents of dictionary as list are : 
dict_items([('Name', 'Nandini'), ('Age', 19)])

3. len() :- It returns the count of key entities of the dictionary elements.

4. type() :- This function returns the data type of the argument.

# Python code to demonstrate working of
# len() and type()
  
# Initializing dictionary
dic = { 'Name' : 'Nandini', 'Age' : 19, 'ID' : 2541997 }
  
# Initializing list
li = [ 1, 3, 5, 6 ]
  
# using len() to display dic size
print ("The size of dic is : ",end="")
print (len(dic))
  
# using type() to display data type
print ("The data type of dic is : ",end="")
print (type(dic))
  
# using type() to display data type
print ("The data type of li is : ",end="")
print (type(li))

Output:

The size of dic is : 3
The data type of dic is : 
The data type of li is :

5. copy() :- This function creates the shallow copy of the dictionary into other dictionary.

6. clear() :- This function is used to clear the dictionary contents.

# Python code to demonstrate working of
# clear() and copy()
  
# Initializing dictionary
dic1 = { 'Name' : 'Nandini', 'Age' : 19 }
  
# Initializing dictionary 
dic3 = {}
  
# using copy() to make shallow copy of dictionary
dic3 = dic1.copy()
  
# printing new dictionary
print ("The new copied dictionary is : ")
print (dic3.items())
  
# clearing the dictionary
dic1.clear()
  
# printing cleared dictionary
print ("The contents of deleted dictionary is : ",end="")
print (dic1.items())

Output:

The new copied dictionary is : 
dict_items([('Age', 19), ('Name', 'Nandini')])
The contents of deleted dictionary is : dict_items([])

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