map Get value in Python 3.10

To get the value of a key in a hash (or dictionary) in Python 3.10, you can use the indexing syntax by providing the key inside square brackets. If the key is present in the dictionary, this will return its corresponding value.

Here is an example:

``python # Create a dictionary my_dict = {'apple': 2, 'banana': 5, 'orange': 1}


# Retrieve the value of the 'apple' key

apple_value = my_dict['apple']

print(apple_value)  # Output: 2



In the above example, we created a dictionary named my_dict with three key-value pairs. We retrieved the value of the 'apple' key by using the indexing syntax and assigned it to the variable apple_value. Finally, we printed the value of the variable apple_value to the console.
If the key you are trying to retrieve doesn't exist in the dictionary, an error is raised. Here's an example:
 python

# Create a dictionary

my_dict = {'apple': 2, 'banana': 5, 'orange': 1}
# Try to retrieve a non-existent key

mango_value = my_dict['mango']



In the above example, we tried to retrieve the value of a non-existent key named 'mango'. This raises a KeyError with the message "mango". To handle this error, you can use the get() method instead, which returns None (or a default value of your choice) instead of raising an error. Here's an example:
 python

# Create a dictionary

my_dict = {'apple': 2, 'banana': 5, 'orange': 1}
# Try to retrieve a non-existent key with get() method

mango_value = my_dict.get('mango')
# mango_value is None

print(mango_value)  # Output: None

# You can also provide a default value of your choice mango_value = my_dict.get('mango', 'not found') print(mango_value) # Output: not found`

In this example, we used the get() method to retrieve the value of the 'mango' key. Since 'mango' is not present in the dictionary, get() returns None by default. We then printed the value of the variable mango_value to the console. We also showed how to provide a default value using the second argument of the get()` method.

map Get value in Python 3.10

See this concept in other languages