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@milaan9
milaan9 authored Jun 23, 2021
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144 changes: 144 additions & 0 deletions 005_Python_Dictionary_Methods/001_Python_Dictionary_clear().ipynb
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{
"cells": [
{
"cell_type": "markdown",
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"source": [
"<small><small><i>\n",
"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",
"</i></small></small>"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"# Python Dictionary `clear()`\n",
"\n",
"The **`clear()`** method removes all items from the dictionary.\n",
"\n",
"**Syntax**:\n",
"\n",
"```python\n",
"dict.clear()\n",
"```"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## `clear()` Parameters\n",
"\n",
"The **`clear()`** method doesn't take any parameters."
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Return Value from `clear()`\n",
"\n",
"The **`clear()`** method doesn't return any value (returns **`None`**)."
]
},
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"text": [
"d = {}\n"
]
}
],
"source": [
"# Example 1: How clear() method works for dictionaries?\n",
"\n",
"d = {1: \"one\", 2: \"two\"}\n",
"\n",
"d.clear()\n",
"print('d =', d)"
]
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235 changes: 235 additions & 0 deletions 005_Python_Dictionary_Methods/002_Python_Dictionary_copy().ipynb
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{
"cells": [
{
"cell_type": "markdown",
"metadata": {},
"source": [
"<small><small><i>\n",
"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",
"</i></small></small>"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"# Python Dictionary `copy()`\n",
"\n",
"The **`copy()`** method returns a shallow copy of the dictionary.\n",
"\n",
"**Syntax**:\n",
"\n",
"```python\n",
"dict.copy()\n",
"```"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## `copy()` Parameters\n",
"\n",
"The **`copy()`** method doesn't take any parameters."
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Return Value from `copy()`\n",
"\n",
"The **`copy()`** method method returns a shallow copy of the dictionary. It doesn't modify the original dictionary."
]
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"text": [
"Orignal: {1: 'one', 2: 'two'}\n",
"New: {1: 'one', 2: 'two'}\n"
]
}
],
"source": [
"# Example 1: How copy works for dictionaries?\n",
"\n",
"original = {1:'one', 2:'two'}\n",
"new = original.copy()\n",
"\n",
"print('Orignal: ', original)\n",
"print('New: ', new)"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Difference in Using `copy()` method, and `=` Operator to Copy Dictionaries\n",
"\n",
"When **`copy()`** method is used, a new dictionary is created which is filled with a copy of the references from the original dictionary.\n",
"\n",
"When **`=`** operator is used, a new reference to the original dictionary is created."
]
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"new: {}\n",
"original: {}\n"
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"# Example 2: Using = Operator to Copy Dictionaries\n",
"\n",
"original = {1:'one', 2:'two'}\n",
"new = original\n",
"\n",
"# removing all elements from the list\n",
"new.clear()\n",
"\n",
"print('new: ', new)\n",
"print('original: ', original)"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"**Note:** Here, when **`new`** dictionary is cleared, **`original`** dictionary is also cleared."
]
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"# Example 3: Using copy() to Copy Dictionaries\n",
"\n",
"original = {1:'one', 2:'two'}\n",
"new = original.copy()\n",
"\n",
"# removing all elements from the list\n",
"new.clear()\n",
"\n",
"print('new: ', new)\n",
"print('original: ', original)"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"**Note:** Here, when **`new`** dictionary is cleared, **`original`** dictionary remains unchanged."
]
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