Golang一行循环

I was trying to read in CSV file in Golang line by line with a for loop that required an if statement with a break to see if the error reading the file was EOF. I find this syntax rather unnecessary when I could in java for example read the line inside a while loop conditional and simultaneously check for the EOF error. I thought that declaring a variable inside of a for loop was possible and I know for sure that you can do this with if statements in Golang. Doing:

if v := 2; v > 1{
    fmt.Println("2 is better than 1")
}

The first snippet of code I have here is what I know to work in my program.

reader := csv.NewReader(some_file)

for {
    line, err := reader.Read()
    if err == io.EOF {
        break
    }
    //do data parsing from your line here
}

I do not know whether or not this second snippet is conceptually possible or just syntactically incorrect.

reader := csv.NewReader(some_file)

for line, err := reader.Read(); err != io.EOF {
    //do data parsing from your line here
}

Would like some clarification/benefits/conventions of doing it one way over another, Thanks :)

It is conventional way to write simpler statements rather than lengthy, complex one, isn't it?

So, I consider the 1st version is more conventional way than the 2nd version. Moreover, the for loop in your 2nd version isn't in the right way. If you want to use that, then fix it like following or whatever you wish:

for line, err := reader.Read(); err != io.EOF; line, err = reader.Read() {
    //do data parsing from your line here
}