Python programming language. Try...Except

Опубликовано: 08 Июль 2026
на канале: YouRails

Comprehensive guide to try, except, and custom exceptions

Unlock the power of Python's try, except, else, and finally blocks for robust error handling. Learn about exception hierarchy, catching and raising exceptions, and creating custom exceptions to enhance your code's reliability and maintainability.

Chapters:

00:00 Title Card

00:02 Basic Structure of Try...Except
Summary:
Understand try, except, else, finally blocks
Use try to wrap code that may cause exceptions
Handle exceptions with except block
Execute code after try block with else
Ensure final execution with finally blocktry:
code that may fail
pass
except Exception:
handle error
else:
if no error
finally:
always run

00:04 Understanding Exception Hierarchy
Summary:
Recognize built-in exceptions
Learn the hierarchy of exceptions
Identify base class Exception
Differentiate between specific exceptions
Utilize hierarchy for better exception handlingtry:
x = 1 / 0
except ZeroDivisionError:
print("Cannot divide by zero")
except Exception as e:
print(e)

00:06 Catching Specific Exceptions
Summary:
Catch specific exceptions using except
Handle multiple exceptions in a single block
Use tuple to handle multiple exceptions
Prioritize specific exceptions over general
Avoid catching broad exceptions unnecessarilytry:
x = 1 / 0
except ZeroDivisionError:
print("Cannot divide by zero")
except (TypeError, ValueError):
pass

00:08 Raising Exceptions Manually
Summary:
Use raise statement to trigger exceptions
Raise exceptions when conditions are met
Provide informative error messages
Control program flow with manual exceptions
Ensure proper exception handling with raisetry:
raise ValueError(
"Invalid value!")
except ValueError
as e:
print(e)

00:10 Creating Custom Exceptions
Summary:
Extend Exception class for custom exceptions
Define new exception classes
Use custom exceptions for specific errors
Enhance error handling with tailored exceptions
Integrate custom exceptions into existing codeclass MyError(
Exception):
pass

try:
raise MyError(
"An error occurred")
except MyError
as e:
print(e)

00:12 End Card

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