human
Solve the following python programming problem given the following code:
def factor_terms(expr, radical = False, clear = False, fraction = False, sign = True) : 
    "Remove common factors from terms in all arguments without
    changing the underlying structure of the expr. No expansion or
    simplification (and no processing of non-commutatives) is performed.

    If radical=True then a radical common to all terms will be factored
    out of any Add sub-expressions of the expr.

    If clear=False (default) then coefficients will not be separated
    from a single Add if they can be distributed to leave one or more
    terms with integer coefficients.

    If fraction=True (default is False) then a common denominator will be
    constructed for the expression.

    If sign=True (default) then even if the only factor in common is a -1,
    it will be factored out of the expression.

    Examples
    ========

    >>> from sympy import factor_terms, Symbol
    >>> from sympy.abc import x, y
    >>> factor_terms(x + x*(2 + 4*y)**3)
    x*(8*(2*y + 1)**3 + 1)
    >>> A = Symbol('A', commutative=False)
    >>> factor_terms(x*A + x*A + x*y*A)
    x*(y*A + 2*A)

    When ``clear`` is False, a rational will only be factored out of an
    Add expression if all terms of the Add have coefficients that are
    fractions:

    >>> factor_terms(x/2 + 1, clear=False)
    x/2 + 1
    >>> factor_terms(x/2 + 1, clear=True)
    (x + 2)/2

    If a -1 is all that can be factored out, to *not* factor it out, the
    flag ``sign`` must be False:

    >>> factor_terms(-x - y)
    -(x + y)
    >>> factor_terms(-x - y, sign=False)
    -x - y
    >>> factor_terms(-2*x - 2*y, sign=False)
    -2*(x + y)

    See Also
    ========
    gcd_terms, sympy.polys.polytools.terms_gcd

    " 
    def do(expr) : 
        is_iterable = iterable (expr) 
        if ((not isinstance (expr, Basic)) or expr.is_Atom) : 
            if is_iterable : 
                return type (expr) ([do (i) for i in expr]) 
return expr 
if (expr.is_Pow or expr.is_Function or is_iterable or (not hasattr (expr, 'args_cnc'))) : 
         ...

    
    

    Fix the buggy line: expr = sympify (clear)
assistant
#Here is Python code to fix the buggy line: expr = sympify (clear)
.

expr = sympify (expr)