title: How to set breakpoints in a library module (pdb)
body: <p>I am debugging a python script which sys.path looks like</p>
  
  <pre><code>sys.path = ['','home/my_library', ..]
  </code></pre>
  
  <p>I'm having troubles to set a breakpoint in a module from <code>my_library</code> while using pdb. 
  The script imports the library with:</p>
  
  <pre><code>import my_library as foo
  </code></pre>
  
  <p>In turn, my_library makes its module(s) available by:</p>
  
  <pre><code>from my_module import bar
  </code></pre>
  
  <p><strong>How can address my_module's code while running pdb on my script?</strong></p>
  
  <p>PS: I have tried the followings without success:</p>
  
  <pre><code>b my_module:1
  b my_library.my_module:1
  b my_library.bar:1
  b foo.my_module:1
  b foo.bar:1
  </code></pre>