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Commit ffca067

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finish zip()
1 parent 46cefdd commit ffca067

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3 files changed

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3 files changed

+296
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{
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"cells": [
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"# zip()\n",
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"\n",
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"Make an iterator that aggregates elements from each of the iterables.\n",
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"\n",
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"Returns an iterator of tuples, where the i-th tuple contains the i-th element from each of the argument sequences or iterables. The iterator stops when the shortest input iterable is exhausted. With a single iterable argument, it returns an iterator of 1-tuples. With no arguments, it returns an empty iterator."
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]
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},
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{
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"cell_type": "code",
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"execution_count": 7,
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"metadata": {},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"[(1, 4), (2, 5), (3, 6)]\n"
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]
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}
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],
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"source": [
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"x = [1, 2, 3]\n",
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"y = [4, 5, 6]\n",
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"zipped_list = list(zip(x, y))\n",
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"print(zipped_list)"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"This extends to as many iterables as you want:"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 19,
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"metadata": {},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"[(1, 4, 7, 10), (2, 5, 8, 11), (3, 6, 9, 12)]\n"
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]
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}
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],
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"source": [
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"x = [1, 2, 3]\n",
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"y = [4, 5, 6]\n",
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"z = [7, 8, 9]\n",
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"w = [10, 11, 12]\n",
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"zipped_list = list(zip(x, y, z, w))\n",
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"print(zipped_list)"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"`zip()` should only be used with unequal length inputs when you don’t care about trailing, unmatched values from the longer iterables. If those values are important, use `itertools.zip_longest()` instead.\n",
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"\n",
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"`zip()` in conjunction with the `*` operator can be used to unzip a list:"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 23,
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"metadata": {},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"[(1, 4), (2, 5), (3, 6)] \n",
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"\n",
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"(1, 2, 3)\n",
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"(4, 5, 6)\n"
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]
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}
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],
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"source": [
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"x = [1, 2, 3]\n",
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"y = [4, 5, 6]"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"You can also use `zip(key_list, value_list)` to easily create dictionaries from a pair of lists:"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 28,
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"metadata": {},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"{'Peter Parker': 'Spiderman', 'Tony Stark': 'Iron Man', 'Clark Kent': 'Superman'} \n",
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"\n",
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"dict_keys(['Peter Parker', 'Tony Stark', 'Clark Kent'])\n",
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"dict_values(['Spiderman', 'Iron Man', 'Superman'])\n"
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]
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}
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],
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"source": [
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"names = [\"Peter Parker\", \"Tony Stark\", \"Clark Kent\"]\n",
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"aliases = [\"Spiderman\", \"Iron Man\", \"Superman\"]\n",
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"\n",
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"superheroes = dict(zip(names, aliases))\n",
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"print(superheroes, '\\n')\n",
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"print(superheroes.keys())\n",
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"print(superheroes.values())"
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]
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}
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],
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"metadata": {
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"kernelspec": {
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"display_name": "Python 3",
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"language": "python",
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"name": "python3"
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},
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"language_info": {
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"codemirror_mode": {
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"name": "ipython",
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"version": 3
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},
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"file_extension": ".py",
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"mimetype": "text/x-python",
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"name": "python",
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"nbconvert_exporter": "python",
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"pygments_lexer": "ipython3",
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"version": "3.6.4"
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}
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},
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"nbformat": 4,
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"nbformat_minor": 2
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}

‎built_in_functions/zip.ipynb

Lines changed: 148 additions & 0 deletions
Original file line numberDiff line numberDiff line change
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{
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"cells": [
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{
4+
"cell_type": "markdown",
5+
"metadata": {},
6+
"source": [
7+
"# zip()\n",
8+
"\n",
9+
"Make an iterator that aggregates elements from each of the iterables.\n",
10+
"\n",
11+
"Returns an iterator of tuples, where the i-th tuple contains the i-th element from each of the argument sequences or iterables. The iterator stops when the shortest input iterable is exhausted. With a single iterable argument, it returns an iterator of 1-tuples. With no arguments, it returns an empty iterator."
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]
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},
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{
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"cell_type": "code",
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"execution_count": 7,
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"metadata": {},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
22+
"text": [
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"[(1, 4), (2, 5), (3, 6)]\n"
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]
25+
}
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],
27+
"source": [
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"x = [1, 2, 3]\n",
29+
"y = [4, 5, 6]\n",
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"zipped_list = list(zip(x, y))\n",
31+
"print(zipped_list)"
32+
]
33+
},
34+
{
35+
"cell_type": "markdown",
36+
"metadata": {},
37+
"source": [
38+
"This extends to as many iterables as you want:"
39+
]
40+
},
41+
{
42+
"cell_type": "code",
43+
"execution_count": 19,
44+
"metadata": {},
45+
"outputs": [
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{
47+
"name": "stdout",
48+
"output_type": "stream",
49+
"text": [
50+
"[(1, 4, 7, 10), (2, 5, 8, 11), (3, 6, 9, 12)]\n"
51+
]
52+
}
53+
],
54+
"source": [
55+
"x = [1, 2, 3]\n",
56+
"y = [4, 5, 6]\n",
57+
"z = [7, 8, 9]\n",
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"w = [10, 11, 12]\n",
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"zipped_list = list(zip(x, y, z, w))\n",
60+
"print(zipped_list)"
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]
62+
},
63+
{
64+
"cell_type": "markdown",
65+
"metadata": {},
66+
"source": [
67+
"`zip()` should only be used with unequal length inputs when you don’t care about trailing, unmatched values from the longer iterables. If those values are important, use `itertools.zip_longest()` instead.\n",
68+
"\n",
69+
"`zip()` in conjunction with the `*` operator can be used to unzip a list:"
70+
]
71+
},
72+
{
73+
"cell_type": "code",
74+
"execution_count": 23,
75+
"metadata": {},
76+
"outputs": [
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{
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"name": "stdout",
79+
"output_type": "stream",
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"text": [
81+
"[(1, 4), (2, 5), (3, 6)] \n",
82+
"\n",
83+
"(1, 2, 3)\n",
84+
"(4, 5, 6)\n"
85+
]
86+
}
87+
],
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"source": [
89+
"x = [1, 2, 3]\n",
90+
"y = [4, 5, 6]"
91+
]
92+
},
93+
{
94+
"cell_type": "markdown",
95+
"metadata": {},
96+
"source": [
97+
"You can also use `zip(key_list, value_list)` to easily create dictionaries from a pair of lists:"
98+
]
99+
},
100+
{
101+
"cell_type": "code",
102+
"execution_count": 28,
103+
"metadata": {},
104+
"outputs": [
105+
{
106+
"name": "stdout",
107+
"output_type": "stream",
108+
"text": [
109+
"{'Peter Parker': 'Spiderman', 'Tony Stark': 'Iron Man', 'Clark Kent': 'Superman'} \n",
110+
"\n",
111+
"dict_keys(['Peter Parker', 'Tony Stark', 'Clark Kent'])\n",
112+
"dict_values(['Spiderman', 'Iron Man', 'Superman'])\n"
113+
]
114+
}
115+
],
116+
"source": [
117+
"names = [\"Peter Parker\", \"Tony Stark\", \"Clark Kent\"]\n",
118+
"aliases = [\"Spiderman\", \"Iron Man\", \"Superman\"]\n",
119+
"\n",
120+
"superheroes = dict(zip(names, aliases))\n",
121+
"print(superheroes, '\\n')\n",
122+
"print(superheroes.keys())\n",
123+
"print(superheroes.values())"
124+
]
125+
}
126+
],
127+
"metadata": {
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"kernelspec": {
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"display_name": "Python 3",
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"language": "python",
131+
"name": "python3"
132+
},
133+
"language_info": {
134+
"codemirror_mode": {
135+
"name": "ipython",
136+
"version": 3
137+
},
138+
"file_extension": ".py",
139+
"mimetype": "text/x-python",
140+
"name": "python",
141+
"nbconvert_exporter": "python",
142+
"pygments_lexer": "ipython3",
143+
"version": "3.6.4"
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}
145+
},
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"nbformat": 4,
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"nbformat_minor": 2
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}

‎built_in_functions/zip.py

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