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Adds detail to tuple section #41

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Merged
merged 2 commits into from
Sep 19, 2014
Merged

Adds detail to tuple section #41

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89ae76b
Adds detail to tuple section
willingc Sep 19, 2014
e6c825a
Adds wrap up to this part and link to official Python tutorial
willingc Sep 19, 2014
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149 changes: 137 additions & 12 deletions part-4.ipynb
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Original file line number Diff line number Diff line change
@@ -1,7 +1,7 @@
{
"metadata": {
"name": "",
"signature": "sha256:640caa4f1507ed924c3e826c02125468a1dc8314809695aa3b1b04bcae642559"
"signature": "sha256:7b5c09563e39ddf2ede88b8ff357dcdc654af16292c9c86e3bca2fbf703f64c2"
},
"nbformat": 3,
"nbformat_minor": 0,
Expand Down Expand Up @@ -518,24 +518,33 @@
"\n",
"Tuples are similar to lists except they're immutable, which means we can't change them after they've been made.\n",
"\n",
"One real world use of tuples is to hold one particular record within a complex file. For example, a stock holding or a restaurant inventory.\n",
"\n",
"Tuples are comma-separated lists:"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"stuff = (1, 2, \"hello\")"
"food = (\"cones\", 100, 3.79)"
],
"language": "python",
"metadata": {},
"outputs": []
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"This is sometimes called packing a tuple."
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"stuff"
"food"
],
"language": "python",
"metadata": {},
Expand All @@ -545,7 +554,7 @@
"cell_type": "code",
"collapsed": false,
"input": [
"type(stuff)"
"type(food)"
],
"language": "python",
"metadata": {},
Expand All @@ -562,7 +571,7 @@
"cell_type": "code",
"collapsed": false,
"input": [
"stuff = 1, 2, 3"
"food = \"sprinkles\", 10, 4.99"
],
"language": "python",
"metadata": {},
Expand All @@ -572,7 +581,7 @@
"cell_type": "code",
"collapsed": false,
"input": [
"stuff"
"food"
],
"language": "python",
"metadata": {},
Expand All @@ -589,7 +598,7 @@
"cell_type": "code",
"collapsed": false,
"input": [
"stuff[2] = 3"
"food[2] = 3"
],
"language": "python",
"metadata": {},
Expand All @@ -612,6 +621,26 @@
"metadata": {},
"outputs": []
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"empty"
],
"language": "python",
"metadata": {},
"outputs": []
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"type(empty)"
],
"language": "python",
"metadata": {},
"outputs": []
},
{
"cell_type": "markdown",
"metadata": {},
Expand All @@ -623,7 +652,7 @@
"cell_type": "code",
"collapsed": false,
"input": [
"things = (3)"
"food = (3)"
],
"language": "python",
"metadata": {},
Expand All @@ -633,7 +662,7 @@
"cell_type": "code",
"collapsed": false,
"input": [
"things"
"food"
],
"language": "python",
"metadata": {},
Expand All @@ -643,7 +672,7 @@
"cell_type": "code",
"collapsed": false,
"input": [
"type(things)"
"type(food)"
],
"language": "python",
"metadata": {},
Expand All @@ -660,7 +689,7 @@
"cell_type": "code",
"collapsed": false,
"input": [
"things = (3,)"
"food = (3,)"
],
"language": "python",
"metadata": {},
Expand All @@ -670,11 +699,107 @@
"cell_type": "code",
"collapsed": false,
"input": [
"things"
"food"
],
"language": "python",
"metadata": {},
"outputs": []
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"type(food)"
],
"language": "python",
"metadata": {},
"outputs": []
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"Sometimes, unpacking a tuple is also desired."
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"yummies = [(\"cones\", 100, 3.79), (\"sprinkles\", 10, 4.99), (\"hot fudge\", 8, 3.29), (\"nuts\", 6, 8.99)]"
],
"language": "python",
"metadata": {},
"outputs": []
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"yummies[2]"
],
"language": "python",
"metadata": {},
"outputs": []
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"name, amount, price = yummies[2]"
],
"language": "python",
"metadata": {},
"outputs": []
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"print(\"Our ice cream shop serves \" + name + \".\")"
],
"language": "python",
"metadata": {},
"outputs": []
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"print(\"The shop's inventory value for \" + name + \" is $\" + str(amount * price) + \".\")"
],
"language": "python",
"metadata": {},
"outputs": []
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"print(\"All this food talk is making me hungry for \" + yummies[3][0] + \".\")"
],
"language": "python",
"metadata": {},
"outputs": []
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"Why not always use lists instead of tuples? Tuples use less storage space than a list. So if you are reading 1000s of small records from a file, a tuple can be an efficient way to go.\n",
"\n",
"A practical learning tip: When learning a new language, there are many new terms and concepts. Sometimes it is helpful to see a bigger picture of how everything comes together. I'm a lover of \"Table of Contents\" since I can scan the big picture and see where something like a tuple fits in. The official Python tutorial has a very good [Table of Contents]( https://docs.python.org/3.4/tutorial/index.html), and I sometimes take 5 minutes to just click and explore something new to me.\n",
"\n",
"Wow! We've come a long way today. "
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [],
"language": "python",
"metadata": {},
"outputs": []
}
],
"metadata": {}
Expand Down