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‎005_Python_Dictionary_Methods/001_Python_Dictionary_clear().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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"<small><small><i>\n",
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"All the IPython Notebooks in this lecture series by Dr. Milan Parmar are available @ **[GitHub](https://github.com/milaan9/02_Python_Datatypes/tree/main/005_Python_Dictionary_Methods)**\n",
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"</i></small></small>"
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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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"# Python Dictionary `clear()`\n",
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"\n",
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"The **`clear()`** method removes all items from the dictionary.\n",
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"\n",
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"**Syntax**:\n",
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"\n",
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"```python\n",
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"dict.clear()\n",
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"```"
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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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"## `clear()` Parameters\n",
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"\n",
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"The **`clear()`** method doesn't take any parameters."
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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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"## Return Value from `clear()`\n",
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"\n",
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"The **`clear()`** method doesn't return any value (returns **`None`**)."
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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": 1,
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"metadata": {
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"ExecuteTime": {
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"end_time": "2021-06-09T18:09:38.615061Z",
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"start_time": "2021-06-09T18:09:38.599481Z"
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}
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},
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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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"d = {}\n"
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]
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}
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],
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"source": [
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"# Example 1: How clear() method works for dictionaries?\n",
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"\n",
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"d = {1: \"one\", 2: \"two\"}\n",
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"\n",
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"d.clear()\n",
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"print('d =', d)"
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]
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},
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{
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‎005_Python_Dictionary_Methods/002_Python_Dictionary_copy().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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"<small><small><i>\n",
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"All the IPython Notebooks in this lecture series by Dr. Milan Parmar are available @ **[GitHub](https://github.com/milaan9/02_Python_Datatypes/tree/main/005_Python_Dictionary_Methods)**\n",
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"</i></small></small>"
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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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"# Python Dictionary `copy()`\n",
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"\n",
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"The **`copy()`** method returns a shallow copy of the dictionary.\n",
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"\n",
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"**Syntax**:\n",
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"\n",
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"```python\n",
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"dict.copy()\n",
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"```"
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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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"## `copy()` Parameters\n",
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"\n",
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"The **`copy()`** method doesn't take any parameters."
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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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"## Return Value from `copy()`\n",
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"\n",
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"The **`copy()`** method method returns a shallow copy of the dictionary. It doesn't modify the original dictionary."
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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": 1,
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"metadata": {
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"ExecuteTime": {
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"end_time": "2021-06-09T18:09:50.137840Z",
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"start_time": "2021-06-09T18:09:50.119339Z"
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}
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},
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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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"Orignal: {1: 'one', 2: 'two'}\n",
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"New: {1: 'one', 2: 'two'}\n"
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]
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}
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],
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"source": [
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"# Example 1: How copy works for dictionaries?\n",
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"\n",
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"original = {1:'one', 2:'two'}\n",
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"new = original.copy()\n",
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"\n",
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"print('Orignal: ', original)\n",
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"print('New: ', new)"
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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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"## Difference in Using `copy()` method, and `=` Operator to Copy Dictionaries\n",
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"\n",
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"When **`copy()`** method is used, a new dictionary is created which is filled with a copy of the references from the original dictionary.\n",
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"\n",
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"When **`=`** operator is used, a new reference to the original dictionary is created."
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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": 2,
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"metadata": {
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"ExecuteTime": {
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"end_time": "2021-06-09T18:09:52.023653Z",
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"start_time": "2021-06-09T18:09:52.010019Z"
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}
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},
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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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"new: {}\n",
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"original: {}\n"
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]
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}
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],
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"source": [
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"# Example 2: Using = Operator to Copy Dictionaries\n",
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"\n",
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"original = {1:'one', 2:'two'}\n",
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"new = original\n",
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"\n",
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"# removing all elements from the list\n",
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"new.clear()\n",
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"\n",
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"print('new: ', new)\n",
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"print('original: ', original)"
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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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"**Note:** Here, when **`new`** dictionary is cleared, **`original`** dictionary is also cleared."
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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": 3,
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"metadata": {
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"ExecuteTime": {
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"end_time": "2021-06-09T18:09:55.590777Z",
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"start_time": "2021-06-09T18:09:55.568376Z"
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}
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},
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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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"new: {}\n",
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"original: {1: 'one', 2: 'two'}\n"
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]
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}
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],
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"source": [
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"# Example 3: Using copy() to Copy Dictionaries\n",
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"\n",
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"original = {1:'one', 2:'two'}\n",
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"new = original.copy()\n",
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"\n",
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"# removing all elements from the list\n",
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"new.clear()\n",
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"\n",
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"print('new: ', new)\n",
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"print('original: ', original)"
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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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"**Note:** Here, when **`new`** dictionary is cleared, **`original`** dictionary remains unchanged."
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]
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},
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