{
 "cells": [
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {
    "collapsed": false
   },
   "outputs": [],
   "source": [
    "def foo(a, b):\n",
    "    global c\n",
    "    \n",
    "    print '1', a, b\n",
    "    a = 'yes'\n",
    "    b = 'yes yes'\n",
    "    #print '1.5', c\n",
    "    c = 'maybe'\n",
    "    print '1.6', c\n",
    "    print '2', a, b\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {
    "collapsed": false
   },
   "outputs": [],
   "source": [
    "c = 'no'\n",
    "d = 'nono'\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "3 no nono\n",
      "1 no nono\n",
      "1.6 maybe\n",
      "2 yes yes yes\n",
      "4 maybe nono\n"
     ]
    }
   ],
   "source": [
    "print '3', c, d\n",
    "foo(c, d)\n",
    "print '4', c, d"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {
    "collapsed": false
   },
   "outputs": [],
   "source": [
    "import datetime"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "metadata": {
    "collapsed": false
   },
   "outputs": [],
   "source": [
    "def goo(a=datetime.datetime.now):\n",
    "    try:\n",
    "        b = a()\n",
    "    except TypeError:\n",
    "        b = a\n",
    "    print 'a is', repr(a), 'b is', b"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "a is <built-in method now of type object at 0xb726e8a0> b is 2014-11-08 10:51:35.073836\n"
     ]
    }
   ],
   "source": [
    "goo()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "a is 'world' b is world\n"
     ]
    }
   ],
   "source": [
    "goo('world')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 8,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "a is 5 b is 5\n"
     ]
    }
   ],
   "source": [
    "goo(5)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 9,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "a is {'hello': 'world'} b is {'hello': 'world'}\n"
     ]
    }
   ],
   "source": [
    "goo({'hello': 'world'})"
   ]
  }
 ],
 "metadata": {
  "kernelspec": {
   "display_name": "Python 3",
   "language": "python",
   "name": "python3"
  },
  "language_info": {
   "codemirror_mode": {
    "name": "ipython",
    "version": 3
   },
   "file_extension": ".py",
   "mimetype": "text/x-python",
   "name": "python",
   "nbconvert_exporter": "python",
   "pygments_lexer": "ipython3",
   "version": "3.4.3"
  }
 },
 "nbformat": 4,
 "nbformat_minor": 0
}