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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def expr(obj, simplify=True):
 """Convert an arbitrary object into an Expression."""

    if isinstance(obj, Expression):
        return obj
    # False, True, 0, 1
    elif isinstance(obj, int) and obj in {0, 1}:
        return _CONSTS[obj]
    elif isinstance(obj, str):
        ast = pyeda.parsing.boolexpr.parse(obj)
        ex = ast2expr(ast)
        if simplify:
            ex = ex.simplify()
        return ex
    else:
        return One if bool(obj) else Zero