python 3 for scientists

zingale · zingale · commit 7dc10c27f4cf · 2016-07-26T13:15:50.000-04:00
diff --git a/CHANGES b/CHANGES
@@ -1,3 +1,9 @@
+
+-- python 3 for scientists:
+  
+   http://python-3-for-scientists.readthedocs.io/en/latest/
+
+
 -- restructure it all:
 
    after basic introduction class, have students run through ipython
diff --git a/lectures/01-python/python-functions.ipynb b/lectures/01-python/python-functions.ipynb
@@ -303,33 +303,141 @@
     "print(fnew(3))"
    ]
   },
+  {
+   "cell_type": "markdown",
+   "metadata": {
+    "collapsed": false
+   },
+   "source": [
+    "## Lambdas"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "Lambdas are \"disposible\" functions.  These are small, nameless functions that are often used as arguments in other functions.\n",
+    "\n",
+    "Ex, from the official tutorial:"
+   ]
+  },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 3,
+   "metadata": {
+    "collapsed": true
+   },
+   "outputs": [],
+   "source": [
+    "pairs = [(1, 'one'), (2, 'two'), (3, 'three'), (4, 'four')]\n",
+    "pairs.sort(key=lambda p: p[1])"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 4,
    "metadata": {
     "collapsed": false
    },
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "[(4, 'four'), (1, 'one'), (3, 'three'), (2, 'two')]"
+      ]
+     },
+     "execution_count": 4,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "pairs"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "Here we use a lambda in a extract from a list (with the filter command)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 12,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "[0,\n",
+       " 36,\n",
+       " 144,\n",
+       " 324,\n",
+       " 576,\n",
+       " 900,\n",
+       " 1296,\n",
+       " 1764,\n",
+       " 2304,\n",
+       " 2916,\n",
+       " 3600,\n",
+       " 4356,\n",
+       " 5184,\n",
+       " 6084,\n",
+       " 7056,\n",
+       " 8100,\n",
+       " 9216]"
+      ]
+     },
+     "execution_count": 12,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "squares = [x**2 for x in range(100)]\n",
+    "sq = list(filter(lambda x : x%2 == 0 and x%3 == 0, squares))\n",
+    "sq\n"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {
+    "collapsed": true
+   },
+   "outputs": [],
+   "source": []
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {
+    "collapsed": true
+   },
    "outputs": [],
    "source": []
   }
  ],
  "metadata": {
   "kernelspec": {
-   "display_name": "Python 2",
+   "display_name": "Python 3",
    "language": "python",
-   "name": "python2"
+   "name": "python3"
   },
   "language_info": {
    "codemirror_mode": {
     "name": "ipython",
-    "version": 2
+    "version": 3
    },
    "file_extension": ".py",
    "mimetype": "text/x-python",
    "name": "python",
    "nbconvert_exporter": "python",
-   "pygments_lexer": "ipython2",
-   "version": "2.7.10"
+   "pygments_lexer": "ipython3",
+   "version": "3.4.3"
   }
  },
  "nbformat": 4,
diff --git a/lectures/06-sympy/sympy-examples.ipynb b/lectures/06-sympy/sympy-examples.ipynb
