尝试从pandas中的csv连接字段值时接收类型错误

I am attempting to generate full street corner addresses out of fields taken from a .csv. I am using pandas and have written the following code to achieve this result. I am getting back a TypeError about a float object but none of the fields in my dataframe are floats. I iterated through the fields and printed each column type and they all come back strings.. so I am a bit confused. I am attempting to generate full street corner