[Python] Python - Convert String date "17 Apr" to Date "17-04-2018"

I've this string variable: date_string = "17 Apr"

How can I get this: 17-04-2018?

I'm trying with this

datetime_object = datetime.strptime(date_string, "%d %B")


But I'm getting:

builtins.ValueError: time data '17 Apr' does not match format '%d %B


Thanks!

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