This document provides information about a mentoring program run by Baabtra-Mentoring Partner. It includes a trainee's typing speed progress over 5 weeks, with targets and achievements. It also lists 3 job applications with company names, designations, and application dates. Finally, it discusses Python exceptions handling, including try/catch blocks, built-in exception classes, raising exceptions, and error types.

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Exception handling in python

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  Disclaimer: This presentationis prepared by trainees ofbaabtra as a part of mentoring program. This is not officialdocument of baabtra –Mentoring PartnerBaabtra-Mentoring Partner is the mentoring division of baabte System Technologies Pvt .Ltd
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  Typing SpeedWeekTargetAchieved1252323026330284353254038
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  Jobs Applied#123CompanyDesignationApplied DateCurrentStatus
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  Python Exceptions Handlingshafeeque●shafeequemonp@gmail.com●www.facebook.com/shafeequemonppambodan●twitter.com/shafeequemonp●in.linkedin.com/in/shafeequemonp●9809611325
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  What is Exception?●●Anexception is an event, which occurs during the execution of a program, thatdisrupts the normal flow of the program's instructionsWhen a method encounters an abnormal condition (an exception condition) that itcan't handle itself, it may throw an exception.Exception classesprocess●In Java, exceptions are objects●When you throw an exception, you throw an object●●Throwable serves as the base class for an entire family of classes, declaredin javaThrowable has two direct subclasses-Exception-Error
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  ●●●●●Exceptions (members ofthe Exception family) are thrown to signalabnormal conditions that can often be handled by some catcherThough it's possible they may not be caught and therefore couldresult in a dead thread.Errors (members of the Error family) are usually thrown for moreserious problems, such as OutOfMemoryErrorIn general, code you write should throw only exceptions, not errors.Errors are usually thrown by the methods of the Java API, or by theJava virtual machine itself
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  Catching Exceptions:●A methodcatches an exception using a combination othe try and catch keywords●A try/catch block is placed around the code that might generate an exception.●Code within a try/catch block is referred to as protected code●Syntax:●try{//Protected code}catch(ExceptionName e1){//Catch block}
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  // File Name: ExcepTest.javaimport java.io.*;public class ExcepTest{public static void main(String args[]){try{int a[] = new int[2];System.out.println("Access element three :" + a[3]);}catch(ArrayIndexOutOfBoundsException e){System.out.println("Exception thrown :" + e);}System.out.println("Out of the block");}}Output:Exception thrownOut of the block:java.lang.ArrayIndexOutOfBoundsException: 3
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  Errors and Exceptions:SyntaxErrors●●It is also known as parsing errors, are perhaps the most common kind ofcomplaint you get while you are still learning Python>>> while True print 'Hello world'File "<stdin>", line 1, in ?while True print 'Hello world'^SyntaxError: invalid syntax●●●The parser repeats the offending line and displays a little ‘arrow’ pointingat the earliest point in the line where the error was detectedThe error is caused by (or at least detected at) the token preceding thearrow: in the example, the error is detected at the keyword print, since acolon (':') is missing before itFile name and line number are printed so you know where to look incase the input came from a script.
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  Exceptions:●Exceptions should beclass objects●The exceptions are defined in the module exceptions●●●For class exceptions, in a try statement with an except clause thatmentions a particular classEven if a statement or expression is syntactically correct, it may causean error when an attempt is made to execute itErrors detected during execution are called exceptions and are notunconditionally fatal
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  ●>>> 10 *(1/0)Traceback (most recent call last):File "<stdin>", line 1, in ?ZeroDivisionError: integer division or modulo by zero>>> 4 + spam*3Traceback (most recent call last):File "<stdin>", line 1, in ?NameError: name 'spam' is not defined>>> '2' + 2Traceback (most recent call last):File "<stdin>", line 1, in ?TypeError: cannot concatenate 'str' and 'int' objects
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  Handling Exceptions:.>>> whileTrue:...try:...x = int(raw_input("Please enter a number: "))...break......except ValueError:print "Oops! That was no valid number. Try again..."●The try statement works as follows:●First, the try clause (the statement(s) between the try and except keywords) is executed.●●●If no exception occurs, the except clause is skipped and execution of the try statement isfinished.If an exception occurs during execution of the try clause, the rest of the clause is skipped.Then if its type matches the exception named after the except keyword, the except clauseis executed, and then execution continues after the try statement.If an exception occurs which does not match the exception named in the except clause, itis passed on to outer try statements; if no handler is found, it is an unhandled exceptionand execution stops with a message as shown above.
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  Raising Exceptions:●●The raisestatement allows the programmer to force a specified exceptionto occur>>> raise NameError('HiThere')Traceback (most recent call last):File "<stdin>", line 1, in ?NameError: HiThere●●If you need to determine whether an exception was raised but don’tintend to handle it, a simpler form of the raise statement allows you to reraise the exception:>>> try:...raise NameError('HiThere')... except NameError:...print 'An exception flew by!'...raise...An exception flew by!Traceback (most recent call last):File "<stdin>", line 2, in ?NameError: HiThere
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