Exceptions in python
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This document summarizes exceptions in Python. It discusses try and except clauses that allow code to handle and respond to exceptions. Built-in exception classes like AttributeError, ImportError, and IndexError are described. Examples are provided of using try, except, and finally to open a file, run code that may cause an error, and ensure the file is closed. The document was prepared by a trainee at Baabtra as part of a mentoring program.
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Exception Handling In Python | Exceptions In Python | Python Programming Tuto...
Exception Handling In Python | Exceptions In Python | Python Programming Tuto...Edureka! ** Python Certification Training: https://www.edureka.co/python-programming-certification-training **
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1. Connecting to the MySQL server from PHP using mysql_connect().
2. Selecting the database to use with mysql_select_db().
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- 2. Disclaimer: This presentation is prepared by trainees of baabtra as a part of mentoring program. This is not official document of baabtra –Mentoring Partner Baabtra-Mentoring Partner is the mentoring division of baabte System Technologies Pvt . Ltd
- 3. EXCEPTIONS IN PYTHON SHAMEENA.V [email protected] www.facebook.com/shamee na latheef twitter.com/shameena in.linkedin.com/in/shamean 9567135569
- 4. Introduction : Python uses exceptions to communicate errors and anomalies exception is an object that indicates an error or anomalous condition code explicitly raise an exception by executing a raise statement. If a program does not handle an exception, it terminates with an error traceback message
- 5. The try Statement • The try statement provides Python's exception-handling mechanism • It is a compound statement • It can take one of two different forms: 1) try clause followed by one or more except clauses 2) A try clause followed by exactly one finally clause
- 6. 1)try/except Syntax: try: statement(s) except [expression [, target]]: statement(s) [else: statement(s)]
- 7. Contd…. • The body of each except clause is known as an exception handler
- 8. 2) try/finally Syntax: try: statement(s) finally: statement(s) The finally clause establishes what is known as a clean-up handler
- 9. Example : f = open(someFile, "w") try: do_something_with_file(f) finally: f.close( )
- 10. Built-In Exception classes • BaseException mother of all exceptions • Exception : StandardError(base class for all built in exception) ArithmeticError FloatingPointError OverflowError ZeroDivisionError
- 11. AttributeError (On attribute reference or assignment failure ) EnvironmentError (On error outside Python) IOError OSError WindowsError ImportError (On failure of import to find module or name.) LookupError base class for IndexError, KeyError – IndexError On out-of-range sequence subscript - KeyError On reference to a non-existent mapping (dict) key
- 12. NameError UnBoundLocalError On reference to an unassigned local variable SyntaxError On parser encountering a syntax error – IndentationError On parser encountering an indentation syntax error --TabError On improper mixture of spaces and tabs
- 13. Example: try: con = psycopg2.connect(database='testdb', user='shafeequemonp' ) cur = con.cursor() print "Connecting to databasen ->%s" % (con) cur.execute("""INSERT INTO tbl_user(vchr_username) VALUES(%s)""",(ins_login_base.str_name)) con.commit() except psycopg2.DatabaseError, e: if con: con.rollback() print 'Error %s' % e sys.exit(1) finally: if con: con.close() return
- 14. THANKS
- 15. If this presentation helped you, please visit our page facebook.com/baabtra and like it. Thanks in advance. www.baabtra.com | www.massbaab.com |www.baabte.com
- 16. Contact Us Emarald Mall (Big Bazar Building) Mavoor Road, Kozhikode, Kerala, India. Ph: + 91 – 495 40 25 550 NC Complex, Near Bus Stand Mukkam, Kozhikode, Kerala, India. Ph: + 91 – 495 40 25 550 Start up Village Eranakulam, Kerala, India. Email: [email protected]