String Format Overloading (__format__) Dry Run in PYTHON

String Format Overloading (__format__) is an interactive PYTHON dry run visualizer from the Polymorphism programs section. Study the source code, then use the execution controls to follow each step, variable update, highlighted line, and console output.

This page provides a browser-based dry run with source-code highlighting, auto-scroll, voice narration controls, and execution output for learning the program step by step.

String Format Overloading (__format__) Program Code

class Temperature:
    def __init__(self, celsius):
        self.celsius = celsius
        
    def __format__(self, format_spec):
        if format_spec == 'f':
            fahr = (self.celsius * 9/5) + 32
            return f"{fahr} F"
        return f"{self.celsius} C"

t = Temperature(25)
print(format(t))
print(format(t, 'f'))

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