174 lines
3.2 KiB
Plaintext
174 lines
3.2 KiB
Plaintext
{
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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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"# [`for` loops](https://docs.python.org/3/tutorial/controlflow.html#for-statements)"
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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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"## Looping 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": null,
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"metadata": {},
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"outputs": [],
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"source": [
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"my_list = [1, 2, 3, 4, 'Python', 'is', 'neat']\n",
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"for item in my_list:\n",
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" print(item)"
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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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"### `break`\n",
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"Stop the execution of the loop."
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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": null,
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"metadata": {},
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"outputs": [],
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"source": [
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"for item in my_list:\n",
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" if item == 'Python':\n",
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" break\n",
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" print(item)"
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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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"### `continue`\n",
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"Continue to the next item without executing the lines occuring after `continue` inside the loop."
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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": null,
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"metadata": {},
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"outputs": [],
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"source": [
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"for item in my_list:\n",
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" if item == 1:\n",
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" continue\n",
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" print(item)"
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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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"### `enumerate()`\n",
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"In case you need to also know the index:"
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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": null,
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"metadata": {},
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"outputs": [],
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"source": [
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"for idx, val in enumerate(my_list):\n",
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" print('idx: {}, value: {}'.format(idx, val))"
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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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"## Looping dictionaries"
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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": null,
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"metadata": {},
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"outputs": [],
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"source": [
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"my_dict = {'hacker': True, 'age': 72, 'name': 'John Doe'}\n",
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"for val in my_dict:\n",
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" print(val)"
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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": null,
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"metadata": {},
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"outputs": [],
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"source": [
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"for key, val in my_dict.items():\n",
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" print('{}={}'.format(key, val))"
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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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"## `range()`"
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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": null,
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"metadata": {},
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"outputs": [],
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"source": [
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"for number in range(5):\n",
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" print(number)"
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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": null,
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"metadata": {},
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"outputs": [],
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"source": [
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"for number in range(2, 5):\n",
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" print(number)"
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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": null,
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"metadata": {},
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"outputs": [],
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"source": [
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"for number in range(0, 10, 2): # last one is step\n",
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" print(number)"
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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": "3.5.4"
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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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}
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