Commit ed5d112

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Merge pull request #13 from godfreyduke/patch-1

Add a rot13 cipher in response to Issue #7

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	`1`	`+#rot13`
	`2`	`+OFFSET_LOWER = ord('a')`
	`3`	`+OFFSET_UPPER = ord('A')`
	`4`	`+`
	`5`	`+def rot13(text):`
	`6`	`+ rot13_text = ''`
	`7`	`+ for i in range(len(text)):`
	`8`	`+ ch = text[i]`
	`9`	`+ if ch.isalpha():`
	`10`	`+ if(ch.islower()):`
	`11`	`+ offset = OFFSET_LOWER`
	`12`	`+ else:`
	`13`	`+ offset = OFFSET_UPPER`
	`14`	`+ rot13_text += chr(((ord(ch)-offset+13)%26+offset))`
	`15`	`+ else:`
	`16`	`+ rot13_text += ch`
	`17`	`+ return rot13_text`
	`18`	`+`
	`19`	`+plain_text = input("Enter the string: ")`
	`20`	`+print(rot13(plain_text))`
	`21`	`+print(rot13(rot13(plain_text)))`

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