human
Solve the following python programming problem given the following code:
def apply(self, expr, func, args = None, kwargs = None) : 
    '
        Modify parts of an expression selected by a path.

        Examples
        ========

        >>> from sympy.simplify.epathtools import EPath
        >>> from sympy import sin, cos, E
        >>> from sympy.abc import x, y, z, t

        >>> path = EPath("/*/[0]/Symbol")
        >>> expr = [((x, 1), 2), ((3, y), z)]

        >>> path.apply(expr, lambda expr: expr**2)
        [((x**2, 1), 2), ((3, y**2), z)]

        >>> path = EPath("/*/*/Symbol")
        >>> expr = t + sin(x + 1) + cos(x + y + E)

        >>> path.apply(expr, lambda expr: 2*expr)
        t + sin(2*x + 1) + cos(2*x + 2*y + E)

        ' 
    def _apply(path, expr, func) : 
        if (not path) : 
            return func (expr) 
else : 
            (selector, path) = (path [0], path [1 :]) 
            (attrs, types, span) = selector 
            if isinstance (expr, Basic) : 
                if (not expr.is_Atom) : 
                    (args, basic) = (self._get_ordered_args (expr), True) 
else : 
                    return expr 
else : 
                if hasattr (expr, '__iter__') : 
                    (args, basic) = (expr, False) 
else : 
                    return expr 
args = list (args) 
            if (span is not None) : 
                if (type (span) == slice) : 
                    indices = range (* span.indices (len (args))) 
else : 
                    indices = [span] 
else : 
                indices = range (len (args)) 
for i in indices : 
                try : 
                    arg = args [i] 
except IndexError : 
                    continue 
if self._has (arg, attrs, types) : 
                    args [i] = _apply (path, arg, func) 
if basic : 
                return expr.func (* args) 
else : 
                return expr.__class__ (args) 
(_args, _kwargs) = ((args or ()), (kwargs or { 
        
})) 
    _func = (lambda expr : func (expr, * _args, ** _kwargs)) 
    return _apply (self._epath, _kwargs, _func) 

    
    

    Fix the buggy line: return _apply (self._epath, _kwargs, _func)
assistant
#Here is Python code to fix the buggy line: return _apply (self.

return _apply (self._epath, expr, _func)