How to change a value in dictionary Python?

To change a value in a dictionary in Python, you can simply access the key of the value you want to change and assign a new value to it. Here’s an example:

“`python
my_dict = {‘a’: 1, ‘b’: 2, ‘c’: 3}
my_dict[‘a’] = 100
print(my_dict)
“`

This will output: `{‘a’: 100, ‘b’: 2, ‘c’: 3}`

**my_dict[‘a’] = 100**

This single line of code is all you need to change the value associated with the key ‘a’ in the dictionary `my_dict` to 100.

How to add a new key-value pair to a dictionary in Python?

To add a new key-value pair to a dictionary in Python, you can simply assign a value to a new key that doesn’t already exist in the dictionary.

How to delete a key-value pair from a dictionary in Python?

To delete a key-value pair from a dictionary in Python, you can use the `del` keyword followed by the key of the pair you want to delete. For example: `del my_dict[‘a’]`.

Can a dictionary in Python have duplicate keys?

No, a dictionary in Python cannot have duplicate keys. If you try to add a key that already exists in the dictionary, it will simply update the value associated with that key.

How to check if a key exists in a dictionary in Python?

To check if a key exists in a dictionary in Python, you can use the `in` keyword. For example: `if ‘a’ in my_dict:` will return `True` if the key ‘a’ exists in the dictionary `my_dict`.

Can a dictionary in Python have mutable keys?

No, keys in a dictionary in Python must be immutable, which means that they cannot be changed once they are added to the dictionary.

How to get all the keys in a dictionary in Python?

You can get all the keys in a dictionary in Python by using the `keys()` method. For example: `my_dict.keys()` will return a list of all the keys in the dictionary `my_dict`.

How to get all the values in a dictionary in Python?

You can get all the values in a dictionary in Python by using the `values()` method. For example: `my_dict.values()` will return a list of all the values in the dictionary `my_dict`.

How to iterate over a dictionary in Python?

You can iterate over a dictionary in Python using a `for` loop. For example:

“`python
for key, value in my_dict.items():
print(key, value)
“`

Can a dictionary in Python be empty?

Yes, a dictionary in Python can be empty. You can create an empty dictionary by simply using curly braces: `my_dict = {}`.

How to get the length of a dictionary in Python?

You can get the length (number of key-value pairs) of a dictionary in Python by using the `len()` function. For example: `len(my_dict)` will return the number of key-value pairs in the dictionary `my_dict`.

How to merge two dictionaries in Python?

You can merge two dictionaries in Python using the `update()` method. For example: `my_dict1.update(my_dict2)` will merge the dictionary `my_dict2` into `my_dict1`.

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