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Update 150.py

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Original file line number	Diff line number	Diff line change
`@@ -18,3 +18,24 @@ def evalRPN(self, tokens: List[str]) -> int:`
`18`	`18`	`stack.append(c)`
`19`	`19`
`20`	`20`	`returnstack[-1]`
	`21`	`+`
	`22`	`+`
	`23`	`+classSolution:`
	`24`	`+defevalRPN(self,tokens:List[str])->int:`
	`25`	`+s= []`
	`26`	`+x="+-*/"`
	`27`	`+fortokenintokens:`
	`28`	`+iftokennotinx:`
	`29`	`+s.append(int(token))`
	`30`	`+else:`
	`31`	`+a=s.pop()`
	`32`	`+b=s.pop()`
	`33`	`+iftoken=="+":`
	`34`	`+s.append(a+b)`
	`35`	`+eliftoken=="-":`
	`36`	`+s.append(b-a)`
	`37`	`+eliftoken=="*":`
	`38`	`+s.append(a*b)`
	`39`	`+else:`
	`40`	`+s.append(int(b/a))`
	`41`	`+returns[0]`

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