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add solution in Python for 0504_base7.py

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Original file line number	Diff line number	Diff line change
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	`1`	`+def convertToBase7(self, num: int) -> str:`
	`2`	`+ # Case 1: Return 0, if number equals 0`
	`3`	`+ if (num == 0):`
	`4`	`+ return str(0)`
	`5`	`+`
	`6`	`+ absValue = abs(num)`
	`7`	`+ convertedNumber = ''`
	`8`	`+`
	`9`	`+ # Case 2: Use Gorner's Algorithm to convert number`
	`10`	`+ while (absValue > 0):`
	`11`	`+ # Take last digit of given number`
	`12`	`+ lastDigit = absValue % 7`
	`13`	`+ absValue = absValue // 7`
	`14`	`+ convertedNumber = str(lastDigit) + convertedNumber`
	`15`	`+`
	`16`	`+ return '-' + str(convertedNumber) if num < 0 else convertedNumber`

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