Python Dictionary index – Complete tutorial

In this Python tutorial, we will discuss the Python Dictionary index. Here we will also cover the below examples:

  • Python dictionary index of key
  • Python dictionary index Value
  • Python dictionary index range
  • Python dictionary index multiple Keys
  • Python dictionary index exists
  • Python dictionary index number
  • Python dictionary get index from value
  • Python dictionary index vs get
  • Python list dict find index

Python dictionary index

  • In Python dictionary, the elements provide key-value indexing where the order is preserved.
  • Let us see how to access the key-Value pairs from a Dictionary.
  • Use the indexing syntax list[index] to return the key and also use items() function to returns a collection of all the dictionary’s in the form of key-value pairs, which contains as a tuple.

Example:

Let’s take an example and check how to access the index value in a Python dictionary.

my_dict = {} 
my_dict['l'] = 4
my_dict['m'] = 6
my_dict['n'] = 9
new_value = list(my_dict.items())
print(new_value[2])

In the above code, we will first initialize a dictionary and assign them a character in the list. Now use the indexing syntax list[index] and assign them dict.items() function as an argument.

Here is the Screenshot of the following given code

Python dictionary index
Python dictionary index

This is how to access the Python dictionary index.

Read How to convert dictionary to JSON in Python

Python dictionary index of key

  • Let us see how to access the keys from a Python dictionary using index.
  • By using list(*args) with a dictionary it will return a collection of the keys. We can easily use the index to access the required key from the method and convert it to a list.
  • In this example to use the list[index] function and it will return the key at index in the list.

Example:

Let’s take an example and check how to access the keys from the dictionary using the list[index] method.

my_dict = {"m": 1, "l": 2}

new_key = list(my_dict)

index_key = new_key[0]

print(index_key)

Here is the Screenshot of the following given code

Python dictionary index of key
Python dictionary index of key

How to access keys from a Python dictionary

In this example, we will use the Python list() function with the keys(), values() and items() function to perform this particular task.

Example:

my_dict = {'Australia' : 200, 'Germany' : 100, 'Europe' : 300, 'Switzerland' : 400}
  
find_key = 'Germany'
print("dictionary is : " + str(my_dict))
res = list(my_dict.keys()).index(find_key)
print("Index of find key is : " + str(res))

In the above code First, we will be initializing a dictionary along with that initialize a find_key string and assign them a key as a “Germany”. Use list()+keys()+index() to access the required key index in dictionary.

Here is the Screenshot of the following given code

Python dictionary index of key list method
Python dictionary index of key list method

This is how to access keys from a Python dictionary.

Read Python dictionary append with examples

Python dictionary index value

  • Here we can check how to access values from a dictionary using the index in Python.
  • Using the dictionary comprehension+enumerator() function we can easily solve this task.
  • List comprehension is one of the easiest and elegant ways to create a list in Python.
  • We use enumerate function with for loop to track the position of our item in iterable.
  • These functions can be used to access the index value.

Example:

new_list = ['John', 'James', 'Micheal', 'George']

output = {val : x + 1 for x, val in enumerate(new_list)}
  
print("after index keys : " + str(output))

In the above code First, we will be initializing a list and Use the dictionary comprehension+ enumerate() function to access the required index value from a dictionary.

Here is the Screenshot of the following given code

Python dictionary index value
Python dictionary index value

This is how to access index values in a Python dictionary.

How to access Values from Python dictionary

  • In this example, we want to return a collection of all the values from a Python dictionary by using the values() function.
  • This function can be used to map the indexes and also we can use the indexing syntax list[index] to return the Key.

Example:

Let’s take an example and check how to access the values from a dictionary using the index in Python

my_dict = {} 
my_dict['u'] = 8
my_dict['v'] = 7
my_dict['w'] = 6
new_value = list(my_dict.values())
print("Index number of specific value ",new_value[1])

Here is the Screenshot of the following given code

Python dictionary index value method
Python dictionary index value method

This is another way to access Values from the Python dictionary.

Read Python Concatenate Dictionary + Examples

Python dictionary index range

  • Using a range as a dictionary index in Python we can easily use the loop method.
  • In this example, we will run a loop for all the specified keys which is available in the dictionary with conditional checks for a range of values.

Example:

my_dict = {'Oliver' : 4, 'William' :6, 'Wan' : 9, 'Lucas' : 7, 'Benjamin' : 5} 
a, b = 4,6
  
out = dict()
for key, val in my_dict.items():
    if int(val) >= a and int(val) <= b:
        out[key] = val

print("The range number : " + str(out)) 

In the above code first, we will be initializing a dictionary and assign them a key-value pairs element along with that initializing a range number and using the loop method to iterate values through all keys and print the result.

Here is the Screenshot of the following given code

Python dictionary index range
Python dictionary index range

Check dictionary index range

Let us see how to use filter() and lambda() functions in Python dictionary index range.

Example:

to_dict = {'Chinese' : 4, 'Italian' :6, 'Thai' : 10,'Mexican':5} 

c, d = 4, 6
new_out = {key: val for key, val in filter(lambda sub: int(sub[1]) >= c and
                                   int(sub[1]) <= d, to_dict.items())}
print("The index range value : " + str(new_out)) 

Note: In this example, we can perform the task of filtering using filter() and lambda functions.

Here is the Screenshot of the following given code

Python dictionary index range by lambda function
Python dictionary index range by the lambda function

Read Python Dictionary update with examples

Python dictionary index multiple keys

  • Let us see how to access multiple keys from a Python dictionary using the index.
  • In this example we will combine the list comprehension and enumerate() functions to get the index value of keys in dictionary.

Example:

my_dict = {'Linnea' : 4, 'Shira' : 6, 'Amara' : 7, 'Beatriz' : 8}
  
index_key = "Amara"

out = list(my_dict.items()) 
new_value = [x for x, key in enumerate(out) if key[0] == index_key]

print("Index of search key is : " + str(new_value))

Here is the Screenshot of the following given code

Python dictionary index multiple keys
Python dictionary index multiple keys

Check multiple keys from dictionary using index

By using the list[index] function we will get the index value from the given dictionary.

Example:

Let’s take an example and check how to access the multiple keys from the dictionary using the index.

my_dict = {"m": 1, "l": 2,"n":7}

new_key = list(my_dict)
index_k = new_key[0]
print(index_k)
index_key = new_key[2]
print(index_key)

In the above example, we will use the multiple time list[index] function and it will return the key at index in the list.

Here is the Screenshot of the following given code

Python dictionary index multiple keys method
Python dictionary index multiple keys method

Read Python dictionary values to list

Python dictionary index exists

  • Here we can check whether the index value exists in a Python dictionary or not.
  • In this example, we can use any() method that returns a new list of all the available keys in the dictionary.
  • This function is an inbuilt function in Python which returns true if any of the values of a given iterable sequence like dictionaries are True else it will return false.

Example:

dict = [{1: "m"}, {7: "n"}]
d= any(1 in d for d in dict)
print(d)

Here is the Screenshot of the following given code

Python dictionary index exists
Python dictionary index exists

The above code, we can use to check if index exists in Python dictionary.

Python dictionary index number

  • Let us see how to get index numbers from a dictionary in Python.
  • Use the list[index] function to get index numbers from dictionary. It will return the key and also use items() function to returns a collection from dictionary.

Example:

dictionary = {} 
dictionary['o'] = 4
dictionary['p'] = 9
dictionary['q'] = 6
new_value = list(dictionary.values())
print("Index number of specific value =",new_value[1])

Here is the Screenshot of the following given code

Python dictionary index number
Python dictionary index number

This is how to get index number from a dictionary in Python.

Read Python Dictionary sort

Python dictionary get index from value

  • In Python dictionary to get index from value, we can solve this task by using the combination of two functions are dict and Zip.
  • The dict() method is a built-in function in Python that returns an object or iterable items.
  • The zip() function can be used to map the indexes with the keys.

Example:

Let’s take an example and check how to get the index value

to_dict = ['U.S.A', 'SouthAfrica', 'Paris', 'Polland']
  
new_value = dict(zip(to_dict, range(1, len(to_dict)+1)))
print("Index value : " + str(new_value))

In the above code first, we will be initializing a list and using the dict() +zip() function to access the required index value from a dictionary

Here is the screenshot of the following given code

Python dictionary get index from value
Python dictionary get index from the value

The above code, we can use to get index from value in Python dictionary.

Python dictionary index vs get

  • Here we will compare the Python dictionary index and get() function.
  • The get() method is used to returns the value of the item in such situations. In the case of an index, we can provide key-value indexing where the order is preserved.
  • The get() method accepts two parameters: the key for which you want to search and the default value that returns in the case if the key is not found in the dictionary.

Syntax:

Here is the Syntax of get() function

Dict.get
        (
         Key,
         default=None
        )

Example:

my_dict = {"u":1, "v":2}
print(my_dict.get("u"))
print(my_dict.get("n"))
print(my_dict.get("n","Not Found ! "))

# index value
my_dict = {"m": 1, "l": 2}
new_value = list(my_dict)
index_value = new_value[0]
print(index_value)

Here is the Screenshot of the following given code

Python dictionary index vs get
Python dictionary index vs get

Read Python dictionary filter

Python list dict find index

  • Let us see how to find an index from the dictionary in Python.
  • In this example we can use dictionary comprehension and len() functions to find an index.
  • len() function is a built-in function in Python.

Example:

Let’s take an example and check how to find an index from a Python dictionary.

new_list = ['John', 'George', 'James']

res = {x : new_list[x] for x in range(len(new_list))}
print("indexed value as list is :  " + str(res))

Here is the Screenshot of the following given code

Python list dict find index
Python list dict find an index

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In this Python tutorial, we will discuss the Python Dictionary index. Here we will also see the Python create string examples:

  • Python dictionary index of key
  • Python dictionary index Value
  • Python dictionary index range
  • Python dictionary index multiple Keys
  • Python dictionary index exists
  • Python dictionary index number
  • Python dictionary get index from value
  • Python dictionary index vs get
  • Python list dict find index