String format_map() Method in Python

The format_map() method in Python is used to perform string formatting using a dictionary to provide the values for placeholders in the string. It is similar to the format() method, but instead of passing positional arguments, it takes a dictionary as an argument to map the keys to the corresponding values for replacing placeholders.Here's the syntax of the format_map() method:

string.format_map(mapping)

Parameters:

mapping: A dictionary that maps keys (placeholders) in the string to their corresponding values. The keys in the dictionary should match the placeholders in the string.

Example:

# Example using format_map() method
data = {
    "name": "Alice",
    "age": 30,
    "occupation": "Engineer"
}

message = "Hello, my name is {name}, I am {age} years old, and I work as an {occupation}.".format_map(data)

print(message)

Output:

Hello, my name is Alice, I am 30 years old, and I work as an Engineer.

In this example, we used the format_map() method to format the string using the values from the data dictionary. The keys in the dictionary, such as "name", "age", and "occupation", correspond to the placeholders in the string, and the format_map() method replaced them with the corresponding values.

The format_map() method is useful when you have a dictionary with the necessary values for string formatting, and you want to avoid repetitive positional arguments. It provides a clean and concise way to perform string formatting based on the dictionary's key-value pairs. However, keep in mind that the format_map() method raises a KeyError if a key in the dictionary is not found in the string as a placeholder. Therefore, make sure the dictionary's keys match the placeholders in the string to avoid this error.

String format_map() Method in Python