To do the traversal of the source directory structure you use the walk method in the Python OS module.

要遍历源目录结构，需要使用Python模块os中的walk方法。

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The charity also wants a greater proportion of funding put towards community transport because many people were unable to manage the walk to their nearest method of public transport.

BBC: Bus stop

On top of that, criminals could use the same method to fool the terminal into thinking a transaction was bank-approved, allowing them to walk out of a store with goods they hadn't paid for.

ENGADGET: Security experts hack payment terminals to steal credit card info, play games