Commit cf92f17

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Add function for Raising exception.

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+20

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+20

-1

lines changed

Lines changed: 20 additions & 1 deletion

Original file line number	Diff line number	Diff line change
`@@ -18,7 +18,7 @@ def simple_exception_demo():`
`18`	`18`	`else:`
`19`	`19`	`for line in fh:`
`20`	`20`	`print(line.strip())`
`21`		`-`
	`21`	`+`
`22`	`22`	`def exception_demo():`
`23`	`23`	`print('Notice:\nIn try block, the code execution stops at the line where exception occurs. \`
`24`	`24`	`The further code is not executed.')`
`@@ -40,6 +40,23 @@ def exception_demo_specific_exception():`
`40`	`40`	`for line in fh:`
`41`	`41`	`print(line.strip())`
`42`	`42`
	`43`	`+def raise_exception_demo():`
	`44`	`+ print('Demonstration of raising an exception in python.')`
	`45`	`+`
	`46`	`+ try:`
	`47`	`+ for line in readfile('sample.doc'): print(line.strip())`
	`48`	`+ except IOError as e:`
	`49`	`+ print('File cannot be found,', e)`
	`50`	`+ except ValueError as e:`
	`51`	`+ print('Bad filename.', e)`
	`52`	`+`
	`53`	`+def readfile(filename):`
	`54`	`+ if filename.endswith('.txt'):`
	`55`	`+ fh = open(filename)`
	`56`	`+ return fh.readlines() # This function returns an iterator`
	`57`	`+ else:`
	`58`	`+ raise ValueError('Filename must end with \'.txt\'. Please check the file format.')`
	`59`	`+`
`43`	`60`	`def main():`
`44`	`61`	`simple_exception_demo()`
`45`	`62`	`print()`
`@@ -48,5 +65,7 @@ def main():`
`48`	`65`	`exception_demo_specific_exception()`
`49`	`66`	`print()`
`50`	`67`	`read_file_n_display()`
	`68`	`+ print()`
	`69`	`+ raise_exception_demo()`
`51`	`70`
`52`	`71`	`if __name__ == '__main__':main()`

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