Python String format_map() Method

The format_map() method is a string method that allows you to insert variables from a dictionary into a string with placeholders.

For example:

person = {"name": "Alice", "age": 25}
print("My name is {name} and I am {age} years old.".format_map(person))
# prints My name is Alice and I am 25 years old.

You can also use a subclass of dictionary that provides a default value for missing keys.

For example:

class Default(dict):
    def __missing__(self, key):
        return key

person = Default(name="Bob")
print("Hello, {name}. You are {age} years old.".format_map(person))
# prints Hello, Bob. You are age years old.

If you have any questions about this code, you can drop a line in comment.