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 the items() function to return a collection of all the dictionaries in the form of key-value pairs, which contain 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
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)
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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
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
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
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.
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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
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))
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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
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
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 the dictionary. It will return the key and also use the items() function to return a collection from a 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
This is how to get index number from a dictionary in Python.
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
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 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
You may like the following Python tutorials:
- Python dictionary initialize
- Python split string by space
- Python dictionary comprehension
- Python dictionary find a key by value
- Python for loop index
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
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