code: def strategy_connected_sequential_dfs(G, colors):
      """Returns an iterable over nodes in ``G`` in the order given by a
      depth-first traversal.
  
      The generated sequence has the property that for each node except
      the first, at least one neighbor appeared earlier in the sequence.
  
      ``G`` is a NetworkX graph. ``colors`` is ignored.
  
      """
      return strategy_connected_sequential(G, colors, "dfs")
  
imports: import itertools
  from collections import defaultdict, deque
  import networkx
  from networkx.utils import arbitrary_element, py_random_state
label_desc: Use image node_id 7 for calling a global function with example usage: strategy_connected_sequential_dfs(G, colors) and returns: strategy_connected_sequential