[Python] Python eval: SyntaxError: unexpected character after line continuation character

I want to evaluate a string of a file path to open the file, but I get the error:
File :1 'C:\Users\xxx\Desktop_Revenue\Input' + str(yr) + '\' + 'Survey' + YY + '_revenue.xlsx'

SyntaxError: unexpected character after line continuation character

The syntax error is at '\'

I want to use eval as my file path is passed into a function later


url= " 'C:\\Users\\xxx\\Desktop\\_Revenue\\Input\\' + str(yr) + '\\' + 'Survey' + YY + '_revenue.xlsx'"

def test (yr):
yr=yr
YY=str(yr)[2:]

survey_url= eval(url)

test(2015)

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