1 Python ERROR HANDLING
1. What is Error Handling?
Error handling means dealing with mistakes in a program.
In simple words:
👉 Errors can happen
👉 Python should not crash
👉 We handle errors gracefully
2. What is an Error?
An error happens when Python cannot understand or run your code.
Examples:
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Dividing by zero
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Wrong data type
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File not found
3. Common Types of Errors
| Error Name | When It Happens |
|---|---|
ZeroDivisionError |
Divide by zero |
ValueError |
Wrong value type |
TypeError |
Wrong data type |
FileNotFoundError |
File missing |
NameError |
Variable not defined |
4. Basic Error Handling (try-except)
Example
5. Handling Specific Errors
Example
6. Multiple Except Blocks
Example
7. try-except-else
else runs if no error occurs.
Example
8. try-except-finally
finally runs always.
Example
9. Error Handling with Files
Example
10. Raise Your Own Error
Example
11. Common Beginner Mistakes
❌ Catching All Errors Without Message
👉 Not good practice.
❌ Writing Too Much Code in try
👉 Only risky code should be inside try.
12. Simple Practice Examples
Example 1: Safe Division
Example 2: Input Validation
Example 3: File Read
13. Error vs Exception (Simple)
| Error | Exception |
|---|---|
| Program crash | Can be handled |
| Not controlled | Controlled using try-except |
14. Summary (Python Error Handling)
✔ Errors happen in programs
✔ Try-except prevents crash
✔ Handle specific errors
✔ Use else and finally
✔ Important for real applications
📘 Perfect for Beginner eBook
This chapter is ideal for:
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Python beginner books
-
School & college students
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Self-learners
If you want next, I can write:
-
Custom Exceptions
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Debugging Python Code
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Mini Python Projects
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Real-life Error Handling Examples
Just tell me 😊
