Python 3 reference · String Methods

Python String format_map() Method

Like format(), but takes the values from a single mapping, which can be a dict or a dict subclass with defaults.

Python 3 Since 3.2

Syntax

str.format_map(mapping)

Parameter	Description
`mapping`	A dict (or any mapping) of field names to values.

A new string.

Fill from a dictTry it yourself

user = {"name": "Ada", "role": "admin"}
print("{name} ({role})".format_map(user))

Output

Ada (admin)

Defaults for missing keysTry it yourself

class Default(dict):
    def __missing__(self, key):
        return f"<{key}?>"

print("{name} from {city}".format_map(Default(name="Ada")))

Output

Ada from <city?>

Version	Change
Python 3.2	Added

str.format() · Return a formatted string, filling {} placeholders with the arguments. f-strings are usually simpler.
Python String Formatting · tutorial