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finish zip()
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‎built_in_functions/.ipynb_checkpoints/zip-checkpoint.ipynb

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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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{
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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",
9+
"Make an iterator that aggregates elements from each of the iterables.\n",
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"\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",
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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",
68+
"\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.py

Whitespace-only changes.

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