{
"cells": [
{
"cell_type": "markdown",
"metadata": {},
"source": [
"<small><small><i>\n",
"All the IPython Notebooks in **Python Files** lecture series by **[Dr. Milaan Parmar](https://www.linkedin.com/in/milaanparmar/)** are available @ **[GitHub](https://github.com/milaan9/05_Python_Files)**\n",
"</i></small></small>"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"# Python Errors and Built-in Exceptions\n",
"\n",
"In this class, you will learn about different types of errors and exceptions that are built-in to Python. They are raised whenever the Python interpreter encounters errors.\n",
"\n",
"We can make certain mistakes while writing a program that lead to errors when we try to run it. A python program terminates as soon as it encounters an unhandled error. These errors can be broadly classified into two classes:\n",
"\n",
"1. Syntax errors\n",
"2. Logical errors (Exceptions)"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## 1. Python Syntax Errors\n",
"\n",
"Error caused by not following the proper structure (syntax) of the language is called **syntax error** or **parsing error**."
]
},
{
"cell_type": "code",
"execution_count": 1,
"metadata": {
"ExecuteTime": {
"end_time": "2021-06-18T15:39:26.584572Z",
"start_time": "2021-06-18T15:39:26.566021Z"
},
"scrolled": false
},
"outputs": [
{
"ename": "SyntaxError",
"evalue": "invalid syntax (<ipython-input-1-a8dfd56d4d8e>, line 3)",
"output_type": "error",
"traceback": [
"\u001b[1;36m File \u001b[1;32m\"<ipython-input-1-a8dfd56d4d8e>\"\u001b[1;36m, line \u001b[1;32m3\u001b[0m\n\u001b[1;33m if a < 3\u001b[0m\n\u001b[1;37m ^\u001b[0m\n\u001b[1;31mSyntaxError\u001b[0m\u001b[1;31m:\u001b[0m invalid syntax\n"
]
}
],
"source": [
"# Example 1:\n",
"\n",
"if a < 3"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"**Exaplanation:**\n",
"\n",
"As shown in the example, an arrow indicates where the parser ran into the syntax error.\n",
"\n",
"We can notice here that a colon **`:`** is missing in the **`if`** statement."
]
},
{
"cell_type": "code",
"execution_count": 3,
"metadata": {
"scrolled": true
},
"outputs": [
{
"ename": "SyntaxError",
"evalue": "Missing parentheses in call to 'print'. Did you mean print('hello world')? (<ipython-input-3-cb8ac02fbcd3>, line 3)",
"output_type": "error",
"traceback": [
"\u001b[1;36m File \u001b[1;32m\"<ipython-input-3-cb8ac02fbcd3>\"\u001b[1;36m, line \u001b[1;32m3\u001b[0m\n\u001b[1;33m print 'hello world'\u001b[0m\n\u001b[1;37m ^\u001b[0m\n\u001b[1;31mSyntaxError\u001b[0m\u001b[1;31m:\u001b[0m Missing parentheses in call to 'print'. Did you mean print('hello world')?\n"
]
}
],
"source": [
"# Example 2:\n",
"\n",
"print 'hello world'"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"**Exaplanation:**\n",
"\n",
"As you can see we made a syntax error because we forgot to enclose the string with parenthesis **`()`** and Python already suggests the solution. Let us fix it."
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## 2. Python Logical Errors (Exceptions)\n",
"\n",
"Errors that occur at runtime (after passing the syntax test) are called **exceptions** or **logical errors**.\n",
"\n",
"For instance, they occur when we try to open a file(for reading) that does not exist (**`FileNotFoundError`**), try to divide a number by zero (**`ZeroDivisionError`**), or try to import a module that does not exist (**`ImportError`**).\n",
"\n",
"Whenever these types of runtime errors occur, Python creates an exception object. If not handled properly, it prints a traceback to that error along with some details about why that error occurred.\n",
"\n",
"Let's look at how Python treats these errors:"
]
},
{
"cell_type": "code",
"execution_count": 4,
"metadata": {
"ExecuteTime": {
"end_time": "2021-06-18T15:39:28.907309Z",
"start_time": "2021-06-18T15:39:28.612394Z"
}
},
"outputs": [
{
"ename": "ZeroDivisionError",
"evalue": "division by zero",
"output_type": "error",
"traceback": [
"\u001b[1;31m---------------------------------------------------------------------------\u001b[0m",
"\u001b[1;31mZeroDivisionError\u001b[0m Traceback (most recent call last)",
"\u001b[1;32m<ipython-input-4-9b9247988596>\u001b[0m in \u001b[0;36m<module>\u001b[1;34m\u001b[0m\n\u001b[0;32m 1\u001b[0m \u001b[1;31m# Example 1: ZeroDivisionError\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m 2\u001b[0m \u001b[1;33m\u001b[0m\u001b[0m\n\u001b[1;32m----> 3\u001b[1;33m \u001b[1;36m1\u001b[0m \u001b[1;33m/\u001b[0m \u001b[1;36m0\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m",
"\u001b[1;31mZeroDivisionError\u001b[0m: division by zero"
]
}
],
"source": [
"# Example 1: ZeroDivisionError\n",
"\n",
"1 / 0"
]
},
{
"cell_type": "code",
"execution_count": 5,
"metadata": {
"ExecuteTime": {
"end_time": "2021-06-18T15:39:32.662651Z",
"start_time": "2021-06-18T15:39:32.644100Z"
},
"scrolled": true
},
"outputs": [
{
"ename": "FileNotFoundError",
"evalue": "[Errno 2] No such file or directory: 'imaginary.txt'",
"output_type": "error",
"traceback": [
"\u001b[1;31m---------------------------------------------------------------------------\u001b[0m",
"\u001b[1;31mFileNotFoundError\u001b[0m Traceback (most recent call last)",
"\u001b[1;32m<ipython-input-5-6ac8e81b6f0c>\u001b[0m in \u001b[0;36m<module>\u001b[1;34m\u001b[0m\n\u001b[0;32m 1\u001b[0m \u001b[1;31m# Example 2: FileNotFoundError\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m 2\u001b[0m \u001b[1;33m\u001b[0m\u001b[0m\n\u001b[1;32m----> 3\u001b[1;33m \u001b[0mopen\u001b[0m\u001b[1;33m(\u001b[0m\u001b[1;34m\"imaginary.txt\"\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m",
"\u001b[1;31mFileNotFoundError\u001b[0m: [Errno 2] No such file or directory: 'imaginary.txt'"
]
}
],
"source": [
"# Example 2: FileNotFoundError\n",
"\n",
"open(\"imaginary.txt\")"
]
},
{
"cell_type": "code",
"execution_count": 6,
"metadata": {
"ExecuteTime": {
"end_time": "2021-06-18T15:39:32.662651Z",
"start_time": "2021-06-18T15:39:32.644100Z"
},
"scrolled": false
},
"outputs": [
{
"ename": "ImportError",
"evalue": "cannot import name 'power' from 'math' (unknown location)",
"output_type": "error",
"traceback": [
"\u001b[1;31m---------------------------------------------------------------------------\u001b[0m",
"\u001b[1;31mImportError\u001b[0m Traceback (most recent call last)",
"\u001b[1;32m<ipython-input-6-0ef33cc3a94d>\u001b[0m in \u001b[0;36m<module>\u001b[1;34m\u001b[0m\n\u001b[0;32m 1\u001b[0m \u001b[1;31m# Example 3: ImportError\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m 2\u001b[0m \u001b[1;33m\u001b[0m\u001b[0m\n\u001b[1;32m----> 3\u001b[1;33m \u001b[1;32mfrom\u001b[0m \u001b[0mmath\u001b[0m \u001b[1;32mimport\u001b[0m \u001b[0mpower\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m",
"\u001b[1;31mImportError\u001b[0m: cannot import name 'power' from 'math' (unknown location)"
]
}
],
"source": [
"# Example 3: ImportError\n",
"\n",
"from math import power"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"**Exaplanation:**\n",
"\n",
"There is no function called **`power`** in the **`math`** module, it goes with a different name: **`pow`**."
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## 3. Python NameError\n",
"\n",
"We debugged the error by defining the variable name."
]
},
{
"cell_type": "code",
"execution_count": 7,
"metadata": {
"ExecuteTime": {
"end_time": "2021-06-18T15:39:28.907309Z",
"start_time": "2021-06-18T15:39:28.612394Z"
},
"scrolled": true
},
"outputs": [
{
"ename": "NameError",
"evalue": "name 'age' is not defined",
"output_type": "error",
"traceback": [
"\u001b[1;31m---------------------------------------------------------------------------\u001b[0m",
"\u001b[1;31mNameError\u001b[0m Traceback (most recent call last)",
"\u001b[1;32m<ipython-input-7-119e50d96cfb>\u001b[0m in \u001b[0;36m<module>\u001b[1;34m\u001b[0m\n\u001b[0;32m 1\u001b[0m \u001b[1;31m# Example 1:\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m 2\u001b[0m \u001b[1;33m\u001b[0m\u001b[0m\n\u001b[1;32m----> 3\u001b[1;33m \u001b[0mprint\u001b[0m\u001b[1;33m(\u001b[0m\u001b[0mage\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m",
"\u001b[1;31mNameError\u001b[0m: name 'age' is not defined"
]
}
],
"source": [
"# Example 1:\n",
"\n",
"print(age)"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"**Exaplanation:**\n",
"\n",
"As you can see from the message above, name **`age`** is not defined. Yes, it is true that we did not define an **`age`** variable but we were trying to print it out as if we had had declared it. Now, lets fix this by declaring it and assigning with a value."
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## 4. Python IndexError\n",
"\n",
"We debugged the error by defining the variable name."
]
},
{
"cell_type": "code",
"execution_count": 8,
"metadata": {
"ExecuteTime": {
"end_time": "2021-06-18T15:39:28.907309Z",
"start_time": "2021-06-18T15:39:28.612394Z"
},
"scrolled": false
},
"outputs": [
{
"ename": "IndexError",
"evalue": "list index out of range",
"output_type": "error",
"traceback": [
"\u001b[1;31m---------------------------------------------------------------------------\u001b[0m",
"\u001b[1;31mIndexError\u001b[0m Traceback (most recent call last)",
"\u001b[1;32m<ipython-input-8-c00e5d7d3c3e>\u001b[0m in \u001b[0;36m<module>\u001b[1;34m\u001b[0m\n\u001b[0;32m 2\u001b[0m \u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m 3\u001b[0m \u001b[0mnumbers\u001b[0m \u001b[1;33m=\u001b[0m \u001b[1;33m[\u001b[0m\u001b[1;36m1\u001b[0m\u001b[1;33m,\u001b[0m \u001b[1;36m2\u001b[0m\u001b[1;33m,\u001b[0m \u001b[1;36m3\u001b[0m\u001b[1;33m,\u001b[0m \u001b[1;36m4\u001b[0m\u001b[1;33m,\u001b[0m \u001b[1;36m5\u001b[0m\u001b[1;33m]\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[1;32m----> 4\u001b[1;33m \u001b[0mnumbers\u001b[0m\u001b[1;33m[\u001b[0m\u001b[1;36m5\u001b[0m\u001b[1;33m]\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m",
"\u001b[1;31mIndexError\u001b[0m: list index out of range"
]
}
],
"source": [
"# Example 1:\n",
"\n",
"numbers = [1, 2, 3, 4, 5]\n",
"numbers[5]"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"**Exaplanation:**\n",
"\n",
"In the example above, Python raised an **`IndexError`**, because the list has only indexes from 0 to 4 , so it was out of range."
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## 5. Python ModuleNotFoundError"
]
},
{
"cell_type": "code",
"execution_count": 9,
"metadata": {
"ExecuteTime": {
"end_time": "2021-06-18T15:39:28.907309Z",
"start_time": "2021-06-18T15:39:28.612394Z"
},
"scrolled": true
},
"outputs": [
{
"ename": "ModuleNotFoundError",
"evalue": "No module named 'maths'",
"output_type": "error",
"traceback": [
"\u001b[1;31m---------------------------------------------------------------------------\u001b[0m",
"\u001b[1;31mModuleNotFoundError\u001b[0m Traceback (most recent call last)",
"\u001b[1;32m<ipython-input-9-e2e604bf92de>\u001b[0m in \u001b[0;36m<module>\u001b[1;34m\u001b[0m\n\u001b[0;32m 1\u001b[0m \u001b[1;31m# Example 1:\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m 2\u001b[0m \u001b[1;33m\u001b[0m\u001b[0m\n\u001b[1;32m----> 3\u001b[1;33m \u001b[1;32mimport\u001b[0m \u001b[0mmaths\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m",
"\u001b[1;31mModuleNotFoundError\u001b[0m: No module named 'maths'"
]
}
],
"source": [
"# Example 1:\n",
"\n",
"import maths"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"**Exaplanation:**\n",
"\n",
"In the example above, I added an extra **`s`** to math deliberately and **`ModuleNotFoundError`** was raised. Lets fix it by removing the extra **`s`** from math."
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## 6. Python AttributeError"
]
},
{
"cell_type": "code",
"execution_count": 10,
"metadata": {
"ExecuteTime": {
"end_time": "2021-06-18T15:39:28.907309Z",
"start_time": "2021-06-18T15:39:28.612394Z"
},
"scrolled": true
},
"outputs": [
{
"ename": "AttributeError",
"evalue": "module 'math' has no attribute 'PI'",
"output_type": "error",
"traceback": [
"\u001b[1;31m---------------------------------------------------------------------------\u001b[0m",
"\u001b[1;31mAttributeError\u001b[0m Traceback (most recent call last)",
"\u001b[1;32m<ipython-input-10-df6ce7ede1dc>\u001b[0m in \u001b[0;36m<module>\u001b[1;34m\u001b[0m\n\u001b[0;32m 2\u001b[0m \u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m 3\u001b[0m \u001b[1;32mimport\u001b[0m \u001b[0mmath\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[1;32m----> 4\u001b[1;33m \u001b[0mmath\u001b[0m\u001b[1;33m.\u001b[0m\u001b[0mPI\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m",
"\u001b[1;31mAttributeError\u001b[0m: module 'math' has no attribute 'PI'"
]
}
],
"source": [
"# Example 1:\n",
"\n",
"import math\n",
"math.PI"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"**Exaplanation:**\n",
"\n",
"As you can see, I made a mistake again! Instead of **`pi`**, I tried to call a **`PI`** function from **`math`** module. It raised an **`AttributeError`**, it means, that the function does not exist in the module. Lets fix it by changing from **`PI`** to **`pi`**."
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## 7. Python KeyError"
]
},
{
"cell_type": "code",
"execution_count": 11,
"metadata": {
"ExecuteTime": {
"end_time": "2021-06-18T15:39:28.907309Z",
"start_time": "2021-06-18T15:39:28.612394Z"
},
"scrolled": true
},
"outputs": [
{
"data": {
"text/plain": [
"'Milaan'"
]
},
"execution_count": 11,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"# Example 1:\n",
"\n",
"users = {'name':'Milaan', 'age':96, 'country':'England'}\n",
"users['name']"
]
},
{
"cell_type": "code",
"execution_count": 12,
"metadata": {},
"outputs": [
{
"ename": "KeyError",
"evalue": "'county'",
"output_type": "error",
"traceback": [
"\u001b[1;31m---------------------------------------------------------------------------\u001b[0m",
"\u001b[1;31mKeyError\u001b[0m Traceback (most recent call last)",
"\u001b[1;32m<ipython-input-12-fbf7cddd4b2a>\u001b[0m in \u001b[0;36m<module>\u001b[1;34m\u001b[0m\n\u001b[1;32m----> 1\u001b[1;33m \u001b[0musers\u001b[0m\u001b[1;33m[\u001b[0m\u001b[1;34m'county'\u001b[0m\u001b[1;33m]\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m",
"\u001b[1;31mKeyError\u001b[0m: 'county'"
]
}
],
"source": [
"users['county']"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"**Exaplanation:**\n",
"\n",
"As you can see, there was a typo in the key used to get the dictionary value. so, this is a **`KeyError`** and the fix is quite straight forward. Let's do this!"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## 8. Python TypeError"
]
},
{
"cell_type": "code",
"execution_count": 13,
"metadata": {
"ExecuteTime": {
"end_time": "2021-06-18T15:39:28.907309Z",
"start_time": "2021-06-18T15:39:28.612394Z"
},
"scrolled": true
},
"outputs": [
{
"ename": "TypeError",
"evalue": "unsupported operand type(s) for +: 'int' and 'str'",
"output_type": "error",
"traceback": [
"\u001b[1;31m---------------------------------------------------------------------------\u001b[0m",
"\u001b[1;31mTypeError\u001b[0m Traceback (most recent call last)",
"\u001b[1;32m<ipython-input-13-f7ffd6347533>\u001b[0m in \u001b[0;36m<module>\u001b[1;34m\u001b[0m\n\u001b[0;32m 1\u001b[0m \u001b[1;31m# Example 1:\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m 2\u001b[0m \u001b[1;33m\u001b[0m\u001b[0m\n\u001b[1;32m----> 3\u001b[1;33m \u001b[1;36m6\u001b[0m \u001b[1;33m+\u001b[0m \u001b[1;34m'3'\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m",
"\u001b[1;31mTypeError\u001b[0m: unsupported operand type(s) for +: 'int' and 'str'"
]
}
],
"source": [
"# Example 1:\n",
"\n",
"6 + '3'"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"**Exaplanation:**\n",
"\n",
"In the example above, a **`TypeError`** is raised because we cannot add a number to a string. First solution would be to convert the string to **int** or **float**. Another solution would be converting the number to a string (the result then would be '63'). Let us follow the first fix."
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## 9. Python ValueError"
]
},
{
"cell_type": "code",
"execution_count": 14,
"metadata": {
"ExecuteTime": {
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"\u001b[1;31m---------------------------------------------------------------------------\u001b[0m",
"\u001b[1;31mValueError\u001b[0m Traceback (most recent call last)",
"\u001b[1;32m<ipython-input-14-ee4e8ee8c904>\u001b[0m in \u001b[0;36m<module>\u001b[1;34m\u001b[0m\n\u001b[0;32m 1\u001b[0m \u001b[1;31m# Example 1:\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m 2\u001b[0m \u001b[1;33m\u001b[0m\u001b[0m\n\u001b[1;32m----> 3\u001b[1;33m \u001b[0mint\u001b[0m\u001b[1;33m(\u001b[0m\u001b[1;34m'19a'\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m",
"\u001b[1;31mValueError\u001b[0m: invalid literal for int() with base 10: '19a'"
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"source": [
"# Example 1:\n",
"\n",
"int('19a')"
]
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"source": [
"**Exaplanation:**\n",
"\n",
"In this case we cannot change the given string to a number, because of the **`a`** letter in it."
]
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"## Python Built-in Exceptions\n",
"\n",
"Illegal operations can raise exceptions. There are plenty of built-in exceptions in Python that are raised when corresponding errors occur. We can view all the built-in exceptions using the built-in **`local()`** function as follows:\n",
"\n",
"```python\n",
"print(dir(locals()['__builtins__']))\n",
"```\n",
"\n",
"**`locals()['__builtins__']`** will return a module of built-in exceptions, functions, and attributes. **`dir`** allows us to list these attributes as strings.\n",
"\n",
"Some of the common built-in exceptions in Python programming along with the error that cause them are listed below:\n",
"\n",
"| Exception | Cause of Error |\n",
"|:----| :--- |\n",
"| **`AssertionError`** | Raised when an **`assert`** statement fails. | \n",
"| **`AttributeError`** | Raised when attribute assignment or reference fails. | \n",
"| **`EOFError`** | Raised when the **`input()`** function hits end-of-file condition. | \n",
"| **`FloatingPointError`** | Raised when a floating point operation fails. | \n",
"| **`GeneratorExit`** | Raise when a generator's **`close()`** method is called. | \n",
"| **`ImportError`** | Raised when the imported module is not found. | \n",
"| **`IndexError`** | Raised when the index of a sequence is out of range. | \n",
"| **`KeyError`** | Raised when a key is not found in a dictionary. | \n",
"| **`KeyboardInterrupt`** | Raised when the user hits the interrupt key (**`Ctrl+C`** or **`Delete`**). | \n",
"| **`MemoryError`** | Raised when an operation runs out of memory. | \n",
"| **`NameError`** | Raised when a variable is not found in local or global scope. | \n",
"| **`NotImplementedError`** | Raised by abstract methods. | \n",
"| **`OSError`** | Raised when system operation causes system related error. | \n",
"| **`OverflowError`** | Raised when the result of an arithmetic operation is too large to be represented. | \n",
"| **`ReferenceError`** | Raised when a weak reference proxy is used to access a garbage collected referent. | \n",
"| **`RuntimeError`** | Raised when an error does not fall under any other category. | \n",
"| **`StopIteration`** | Raised by **`next()`** function to indicate that there is no further item to be returned by iterator. | \n",
"| **`SyntaxError`** | Raised by parser when syntax error is encountered. | \n",
"| **`IndentationError`** | Raised when there is incorrect indentation. | \n",
"| **`TabError`** | Raised when indentation consists of inconsistent tabs and spaces. | \n",
"| **`SystemError`** | Raised when interpreter detects internal error. | \n",
"| **`SystemExit`** | Raised by **`sys.exit()`** function. | \n",
"| **`TypeError`** | Raised when a function or operation is applied to an object of incorrect type. | \n",
"| **`UnboundLocalError`** | Raised when a reference is made to a local variable in a function or method, but no value has been bound to that variable. | \n",
"| **`UnicodeError`** | Raised when a Unicode-related encoding or decoding error occurs. | \n",
"| **`UnicodeEncodeError`** | Raised when a Unicode-related error occurs during encoding. | \n",
"| **`UnicodeDecodeError`** | Raised when a Unicode-related error occurs during decoding. | \n",
"| **`UnicodeTranslateError`** | Raised when a Unicode-related error occurs during translating. | \n",
"| **`ValueError`** | Raised when a function gets an argument of correct type but improper value. | \n",
"| **`ZeroDivisionError`** | Raised when the second operand of division or modulo operation is zero. | "
]
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"source": [
"If required, we can also define our own exceptions in Python. To learn more about them, visit Python **[User-defined Exceptions](https://github.com/milaan9/05_Python_Files/blob/main/005_Python_User_defined_Exceptions.ipynb)**.\n",
"\n",
"We can handle these built-in and user-defined exceptions in Python using **`try`**, **`except`** and **`finally`** statements. To learn more about them, visit **[Python try, except and finally statements](https://github.com/milaan9/05_Python_Files/blob/main/004_Python_Exceptions_Handling.ipynb)**."
]
},
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"cell_type": "markdown",
"metadata": {},
"source": [
"## 💻 Exercises ➞ <span class='label label-default'>Python Errors</span>\n",
"\n",
"1. Open you Jupyter Notebook and try all the examples covered in this section."
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