In this article you will learn how you will handle the exception to prevent your program getting crash by using try, except and finally statement. This will help to enhance the readability and clarity.
During writing the program we always think about their program logic and syntax but in spite of there being some program occurring due the exception and program will crash automatically and stop the program for further proceedings.
In this case we will use Python Built-in Exception to escape the program from crashing.
Here are some common built in Function in Python Programming along with errors, that cause them are listed below.
|AssertionError||It is raised when an assert statement fails.|
|AttributeError||It is raised when an invalid attribute reference is made.|
|EOFError||It is raised when input() reaches the end of a file unexpectedly.|
|FloatingPointError||It is raised when Floating point error will be made.|
|GeneratorExit||It is raised when a generator closed the coroutine.|
|ImportError||It is raised when trouble to import the module was not found.|
|IndexError||It is raised when sequence range is out of range.|
|KeyError||It is raised when the value not found|
|KeyboardInterrupt||It is raised when the program is fiercely closed by keyboard.|
|MemoryError||Raised when programs run out of memory.|
|NameError||This error is raised when Python tries to load an object which does not exist in stack..|
|NotImplementedError||It is raised when they require derived classes to override the method.|
|OSError||It is raised when problem found in system|
|OverflowError||This error is raised when arithmetic operations exceed the limits of current Python runtime.|
|ReferenceError||It is raised when a weak reference proxy is used to access an unnecessary data collected reference.|
|RuntimeError||It is raised when there is no category of error is fall.|
|StopIteration||It is raised by the next() further there is no function available for iterate.|
|SyntaxError||It is raised when the syntax error occurs.|
|IndentationError||It is raised when base class for syntax errors related to incorrect indentation.|
|TabError||It is raised when using inconsistent of Space.|
|SystemError||It is raised when gets system internal error.|
|SystemExit||Exception is raised by the sys.exit() function|
|TypeError||It is raised when the unappropial types come.|
|UnboundLocalError||It is raised when the reference made local methods.|
|UnicodeError||It is raised when encode ,encoding and decoding error occurs.|
|UnicodeEncodeError||It is raised when a Unicode-related error occurs during encoding. It is a subclass of UnicodeError.|
|UnicodeDecodeError||It is raised when a Unicode-related error occurs during decoding. It is a subclass of UnicodeError.|
|UnicodeTranslateError||It is raised when get error while translating.|
|ValueError||It is raised when bringing value is different from actual required value.|
|ZeroDivisionError||It is raised when any number is divided by the zero.|
Keywords are used in exception handling ?
Suspecial code comes under this block.
This block has handle form the error
The finally block lets you execute code, regardless of the result of the try- and except blocks.
Lets understand by the program
a=int(input("Enter Number")) b=int(input("Second Number")) print("Division",a/b) print("Addition",a+b)
In this program you will see that there is no logical and syntax mistakes
Enter Number56 Second Number55 Division 1.018181818181818 Addition 111
But you are put zero value in ”B”
Enter Number12 Second Number0 Traceback (most recent call last): File "C:/Users/laptop/AppData/Local/Programs/Python/Python38-32/cal.py", line 3, in
print("Division",a/b) ZeroDivisionError: division by zero
Error – ZeroDivisionError(this is called exception) ,addition syntax was correct but output wasl not display due to program crash .
lets understand another example
If assign string value in both variable:-
Enter Number"INDIA" Traceback (most recent call last): File "C:/Users/laptop/AppData/Local/Programs/Python/Python38-32/cal.py", line 1, in
a=int(input("Enter Number")) ValueError: invalid literal for int() with base 10: '"INDIA"'
ValueError(this is exception)
Let’s use the same program using exception handling
a=int(input("Enter Number")) b=int(input("Second Number")) try: print("Division",a/b) except ValueError: print("Value error") except ZeroDivisionError: print("Putting Value Zero") print("Addition",a+b)
Enter Number44 Second Number0 Putting Value Zero Addition 44
try: f=open("abc.txt","r") except FileNotFoundError: print("Not Found") else: print(f.read()) f.close() finally: print(“Hi am finally block Run all time”)
When the file ‘abc.txt’ does not exist.
Not Found Hi am finally block Run all time
When the file ‘abc.txt’ exists.
India Is a great Country Hi am finally block Run all time