How to fetch value from dictionary in Python?

To fetch a value from a dictionary in Python, you can simply use square brackets [] with the key inside to access the value associated with that key. For example, if you have a dictionary called `my_dict` with the key ‘name’, you can fetch the value like this: `my_dict[‘name’]`.

Dictionaries in Python are a versatile data structure that allows you to store key-value pairs. In order to access the values stored in a dictionary, you need to know the key associated with that value. Here are some commonly asked questions related to fetching values from dictionaries in Python:

How do I check if a key exists in a dictionary in Python?

You can use the `in` keyword to check if a key exists in a dictionary. For example, you can use `if ‘key’ in my_dict:` to check if the key ‘key’ exists in the dictionary `my_dict`.

Can I fetch all the keys of a dictionary in Python?

Yes, you can fetch all the keys of a dictionary in Python using the `keys()` method. This method returns a view object that displays a list of all the keys in the dictionary.

Is it possible to fetch all the values of a dictionary in Python?

Yes, you can fetch all the values of a dictionary in Python using the `values()` method. This method returns a view object that displays a list of all the values in the dictionary.

How do I fetch both keys and values of a dictionary in Python?

You can use the `items()` method to fetch both keys and values of a dictionary in Python. This method returns a view object that displays a list of tuples containing the key-value pairs in the dictionary.

Can I update the value of a key in a dictionary in Python?

Yes, you can update the value of a key in a dictionary in Python by simply assigning a new value to that key. For example, you can update the value of the key ‘name’ in the dictionary `my_dict` like this: `my_dict[‘name’] = ‘John’`.

How do I fetch a default value if a key does not exist in a dictionary?

You can use the `get()` method to fetch a default value if a key does not exist in a dictionary. This method takes the key as the first argument and the default value as the second argument. If the key does not exist, it will return the default value.

Can I fetch a value from a nested dictionary in Python?

Yes, you can fetch a value from a nested dictionary in Python by chaining square brackets together to access the values at different levels of the nested dictionary. For example, if you have a nested dictionary `my_dict` with the key ‘info’ containing another dictionary, you can fetch a value like this: `my_dict[‘info’][‘name’]`.

Is it possible to iterate over a dictionary in Python?

Yes, you can iterate over a dictionary in Python using a `for` loop. By default, iterating over a dictionary will iterate over its keys. If you want to iterate over both keys and values, you can use the `items()` method.

How can I fetch values based on a condition from a dictionary in Python?

You can use a list comprehension to fetch values based on a condition from a dictionary in Python. By iterating over the items of the dictionary and filtering based on the condition, you can create a list of values that meet the criteria.

Can I delete a key from a dictionary in Python?

Yes, you can delete a key from a dictionary in Python using the `del` keyword. For example, you can delete the key ‘name’ from the dictionary `my_dict` like this: `del my_dict[‘name’]`.

How do I fetch values in a specific order from a dictionary in Python?

Dictionaries in Python do not maintain any specific order of keys and values. If you need to fetch values in a specific order, you can sort the keys using the `sorted()` function and then access the values based on the sorted keys.

Can I fetch multiple values from a dictionary at once in Python?

Yes, you can fetch multiple values from a dictionary at once in Python by passing multiple keys inside square brackets. For example, you can fetch the values of keys ‘name’ and ‘age’ from the dictionary `my_dict` like this: `my_dict[‘name’, ‘age’]`.

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