Playing off of that idea, let’s create a small function that traverses the current path and finds the largest files. Python has a useful module for this: os.walk. When called, it produces a tuple with three items: the top-level directory, a list with all the directories found, and ...
所以list1为0时,traverse根本不会再去处理list1这些引用(或者说,list2对list1名义上不存在引用了)。 此时,又有一个问题,如果存在一个外部对象b,对list2引用,subtract_refs函数中处理完list1后,如下图: 当subtract_refs函数中遍历到list2时,list2的副本还会减1吗?显然traverse的作用还是没有理解。 3、垃圾标记...
45traverse = Py_TYPE(FROM_GC(gc))->tp_traverse; 46(void) traverse(FROM_GC(gc), 47(visitproc)visit_decref, 48NULL); 49} 50} update_refs函数里建立了一个引用的副本。 visit_decref函数对引用的副本减1,subtract_refs函数里traverse的作用是遍历对象里的每个引用,运行visit_decref操作。 最后,链表内...
Eulerian Path - Create a program which will take as an input a graph and output either a Eulerian path or a Eulerian cycle, or state that it is not possible. A Eulerian Path starts at one node and traverses every edge of a graph through every node and finishes at another node. A Eul...
release 2.0 *//* call function for all accessible objects */traverseproctp_traverse;/* delete references to contained objects */inquirytp_clear;/* Assigned meaning in release 2.1 *//* rich comparisons */richcmpfunctp_richcompare;/* weak reference enabler */Py_ssize_ttp_weaklistoffset;/* ...
self.eval_node_list = eval_node_list def run(self, feed_dict): node_to_val_map = dict(feed_dict) # Traverse graph in topological sort order and compute values for all nodes. topo_order = find_topo_sort(self.eval_node_list)
An iterator is an object that can remenber to traverse the location. 迭代器对象从集合的第一个元素开始访问,直到所有的元素被访问完结束。迭代器只能往前不会后退。 The Iterator onject starts from the first element of the collection until all the elements are accessed. The iterator can only move fo...
Traverse computation graph backwards in topological order from the end node. For each node, compute local gradient contribution and accumulate. """ if grad_variables is None: # For the starting node v6, the input grad_variables # represents the weight of each component. ...
New walk_stack() and walk_tb() functions to conveniently traverse frame and traceback objects. (Contributed by Robert Collins in bpo-17911.) New lightweight classes: TracebackException, StackSummary, and FrameSummary. (Contributed by Robert Collins in bpo-17911.) Both the print_tb() and prin...
(self):⑤# Get payoffs when the option expires at terminal nodespayoffs=np.maximum(0,(self.STs-self.K)ifself.is_callelse(self.K-self.STs))returnpayoffsdef_traverse_tree_(self,payoffs):⑥# Starting from the time the option expires, traverse# backwards and calculate discounted payoffs at...