strings.py

class CustomString:
    def __init__(self, text):
        self.text = text

    def __str__(self):
        # User-friendly string
        return f"CustomString: {self.text}"

    def __repr__(self):
        # Developer-friendly representation; could be used to recreate the object
        return f"CustomString({self.text!r})"

    def __unicode__(self):
        # In Python 3 this is less used; __str__ already returns a Unicode string.
        return self.text

    def __format__(self, format_spec):
        # Return formatted string; for example, center text in a given width
        return format(self.text, format_spec)

    def __hash__(self):
        return hash(self.text)

    def __bool__(self):
        # For boolean context; empty text returns False
        return bool(self.text)

    def __dir__(self):
        # Return a custom list of attribute names (for interactive use)
        return ["text"]

    def __sizeof__(self):
        # Return the size in bytes (for demonstration, simply length of text)
        return len(self.text)


cs = CustomString("Hello, World!")
print("str:", str(cs))  # str: CustomString: Hello, World!
print("repr:", repr(cs))  # repr: CustomString('Hello, World!')
print("Formatted:", format(cs, "^20"))  # Formatted: Hello, World!
print("Hash:", hash(cs))  # Hash: 1260280734326764466
print("Bool:", bool(cs))  # Bool: True
print("dir:", dir(cs))  # dir: ['text']
print("Size (approx):", cs.__sizeof__(), "bytes")  # Size (approx): 13 bytes

"""
str: CustomString: Hello, World!
repr: CustomString('Hello, World!')
Formatted:    Hello, World!
Hash: 1260280734326764466
Bool: True
dir: ['text']
Size (approx): 13 bytes
"""