format() — Advanced Examples

Formats a value according to a format specification string

format() protocol implementation

Implementing the protocol that format() uses under the hood.

python

# format() - implementing the protocol
class Custom:
    def __format__(self):
        return "custom result"

obj = Custom()
print(format(obj))

Understanding the dunder methods that format() calls helps you customize behavior for your own classes.

Handling unusual inputs and edge cases.

python

# format() edge cases
print("Edge case handling for format()")

# Type checking
print(type(42))

Knowing these edge cases prevents subtle bugs in production.

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