minor edits

python_concurrency.ipynb

@@ -201,7 +201,7 @@
    "source": [
     "### Why you should care\n",
     "- lets you to pick the right tool for the right job\n",
-    "- python threads don't run parallely, you can still do concurrency."
+    "- python threads don't run parallely, but you can still do concurrency."
    ]
   },
   {
@@ -394,9 +394,13 @@
    "metadata": {},
    "source": [
     "## Async\n",
+    "\n",
+    "__practical definition__\n",
+    "A style of concurrent programming in which tasks release their CPU while they\n",
+    "are waiting for some action to complete\n",
+    "\n",
     "- cooperative scheduling - need explicit code to cause task switch.\n",
-    "- Typically single threaded\n",
-    "- Since you control when task switches occur, you don't need locks for synchronization.\n"
+    "- Typically single threaded\n"
    ]
   },
   {
@@ -405,7 +409,10 @@
    "source": [
     "__Advantages__:\n",
     "- very low cost, since no context switch. Incidentally they're cheaper than function calls. Cheaper switching mechanism among all techniques. People prefer this model to locking, \n",
-    "- No cost of synchronization = less CPU consumption. Async servers > threaded servers. You can run many many more async tasks than threads.\n",
+    "- Since you control when task switches occur, you don't need locks for synchronization.\n",
+    "- No stack allocation\n",
+    "- The above two factors allow for high scalibility.\n",
+    "\n",
     "\n",
     "__disadvantages__:\n",
     "- Need code that gives up control\n",
@@ -501,6 +508,7 @@
    "metadata": {},
    "source": [
     "## Recapping\n",
+    "- Parallelism implies Concurrency. But Concurrency doesn’t always mean Parallelism.\n",
     "- Sync: Blocking operations.\n",
     "- Concurrency: Making progress together.\n",
     "- Async: Non blocking operations.\n",
@@ -529,8 +537,11 @@
     "## Links\n",
     "\n",
     "- [python concurrency story](https://powerfulpython.com/blog/python-concurrency-story-pt1/)\n",
+    "\n",
     "- [Python concurrency keynote - Raymond Hettinger](https://www.youtube.com/watch?v=9zinZmE3Ogk)\n",
-    "[Python Concurrency From the Ground Up - David Beazley](https://www.youtube.com/watch?v=MCs5OvhV9S4)\n",
+    "\n",
+    "- [Python Concurrency From the Ground Up - David Beazley](https://www.youtube.com/watch?v=MCs5OvhV9S4)\n",
+    "\n",
     "- [github repo for the talk](https://github.com/madhukar93/python_concurrency)"
    ]
   }