human
Solve the following python programming problem given the following code:
def general_toposort(r_out, deps, debug_print = False, compute_deps_cache = None, deps_cache = None, clients = None) : 
    '
    WRITEME

    Parameters
    ----------
    deps
        A python function that takes a node as input and returns its dependence.
    compute_deps_cache : optional
        If provided deps_cache should also be provided. This is a function like
        deps, but that also cache its results in a dict passed as deps_cache.
    deps_cache : dict
        Must be used with compute_deps_cache.
    clients : dict
        If a dict is passed it will be filled with a mapping of node
        -> clients for each node in the subgraph.

    Notes
    -----
        deps(i) should behave like a pure function (no funny business with
        internal state).

        deps(i) will be cached by this function (to be fast).

        The order of the return value list is determined by the order of nodes
        returned by the deps() function.

        deps should be provided or can be None and the caller provides
        compute_deps_cache and deps_cache. The second option removes a Python
        function call, and allows for more specialized code, so it can be
        faster.

    ' 
    if (compute_deps_cache is None) : 
        deps_cache = { 
            
} 
        def compute_deps_cache(io) : 
            if (io not in deps_cache) : 
                d = deps (io) 
                if d : 
                    if (not isinstance (d, (list, OrderedSet))) : 
                        raise TypeError ('Non-deterministic collections here make toposort non-deterministic.') 
deps_cache [io] = list (d) 
else : 
                    deps_cache [io] = d 
return d 
else : 
                return deps_cache [io] 
assert (deps_cache is not None) 
    assert isinstance (r_out, (tuple, list, deque)) 
    (reachable, _clients) = stack_search (deque (r_out), compute_deps_cache, 'dfs', True) 
    if (clients is not None) : 
        clients.update (_clients) 
sources = deque ([r for r in reachable if (not deps_cache.get...

    
    

    Fix the buggy line: if (not compute_deps_cache [client]) :
assistant
#Here is Python code to fix the buggy line: if (not compute_deps_cache [client]) :
.

if (not deps_cache [client]) :