'''WAP using Python-MySQL connectivity to connect to the database DB20 and do the following :
> DISPLAY ALL RECORDS AND TOTAL NUMBER OF ROWS
> UPDATE THE TRAINS HAVING START AS 'PUNE JUNCTION' TO 'MUMBAI' INSTEAD
> DELETE DATA WHOSE END IS ACCEPTED.
> DISPLAY RECORDS OF A REQURED TNO.
P.S DB20 contains the following table
TABLE : TRAIN
TNO | TNAME | START | END
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11096 | AHIMSA EXPRESS | PUNE JUNCTION | AHMEDABAD JUNCTION
12015 | AJMER SHATABDI | NEW DELHI | AJMER JUNCTION
16513 | PUNE HBJ SPECIAL | PUNE JUNCTION | HABIBGANJ
13005 | AMRITSAR MAIL | HOWRAH JUNCTION | AMRITSAR JUNCTION
12002 | BHOPAL SHATABDI | NEW DELHI | HABIBGANJ
12417 | PRAYAG RAJ EXPRESS | ALLAHABAD JUNCTION | NEW DELHI
14673 | SHAHEED EXPRESS | JAYNAGAR | AMRITSAR JUNCTION
12314 | SEALDAH RAJDHANI | NEW DELHI | SEALDAH
12498 | SHANE PUNJAB | AMRITSAR JUNCTION | NEW DELHI
12451 | SHRAM SHAKTI EXPRESS | KANPUR CENTRAL | NEW DELHI
12030 | SWARNA SHATABDI | AMRITSAR JUNCTION | NEW DELHI
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