How to handle exceptions in Python?
Asked by Science Expert27 days ago
35 views
Error handling techniques.
0
1 answers
1 Answer
In Python, exceptions are runtime errors that can disrupt the normal flow of a program. To handle exceptions and prevent your program from crashing, you use **try-except** blocks. This allows you to catch and respond to errors gracefully.
Here’s the basic structure:
```python
try:
# Code that might raise an exception
result = 10 / 0
except ZeroDivisionError:
# Code to handle the exception
print("You can't divide by zero!")
```
In this example, dividing by zero raises a `ZeroDivisionError`, which is caught by the `except` block, allowing the program to continue running without crashing.
You can also catch multiple exceptions by specifying them in a tuple:
```python
try:
value = int(input("Enter a number: "))
result = 10 / value
except (ValueError, ZeroDivisionError) as e:
print(f"An error occurred: {e}")
```
If you want to execute some code regardless of whether an exception occurs or not, use the `finally` block:
```python
try:
file = open('data.txt', 'r')
data = file.read()
except FileNotFoundError:
print("File not found.")
finally:
file.close()
```
Additionally, you can use the `else` block to run code only if no exception was raised:
```python
try:
num = int(input("Enter a number: "))
except ValueError:
print("Invalid input!")
else:
print(f"You entered {num}")
```
In summary, Python’s exception handling uses `try`, `except`, `else`, and `finally` blocks to manage errors effectively, making your code more robust and user-friendly.
0
0
by James Wilson15 days ago
