How do you write multiline strings in Go?

问题

Does Go have anything similar to Python's multiline strings:

"""line 1
line 2
line 3"""

If not, what is the preferred way of writing strings spanning multiple lines?

回答1:

According to the language specification you can use a raw string literal, where the string is delimited by backticks instead of double quotes.

`line 1
line 2
line 3`

回答2:

You can write:

"line 1" +
"line 2" +
"line 3"

which is the same as:

"line 1line 2line3"

Unlike using back ticks, it will preserve escape characters. Note that the "+" must be on the 'leading' line i.e.:

"line 1"
+"line 2"

generates an error.

回答3:

From String literals:

raw string literal supports multiline (but escaped characters aren't interpreted)
interpreted string literal interpret escaped characters, like '\n'.

But, if your multi-line string has to include a backquote (`), then you will have to use an interpreted string literal:

`line one
  line two ` +
"`" + `line three
line four`

You cannot directly put a backquote (`) in a raw string literal (``xx\).
You have to use (as explained in "how to put a backquote in a backquoted string?"):

 + "`" + ...

回答4:

Use raw string literals for multi-line strings:

func main(){
    multiline := `line 
by line
and line
after line`
}

Raw string literals

Raw string literals are character sequences between back quotes, as in `foo`. Within the quotes, any character may appear except back quote.

A significant part is that is raw literal not just multi-line and to be multi-line is not the only purpose of it.

The value of a raw string literal is the string composed of the uninterpreted (implicitly UTF-8-encoded) characters between the quotes; in particular, backslashes have no special meaning...

So escapes will not be interpreted and new lines between ticks will be real new lines.

func main(){
    multiline := `line 
by line \n
and line \n
after line`

    // \n will be just printed. 
    // But new lines are there too.
    fmt.Print(multiline)
}

Concatenation

Possibly you have long line which you want to break and you don't need new lines in it. In this case you could use string concatenation.

func main(){
    multiline := "line " +
            "by line " +
            "and line " +
            "after line"

    fmt.Print(multiline) // No new lines here
}

Since " " is interpreted string literal escapes will be interpreted.

func main(){
    multiline := "line " +
            "by line \n" +
            "and line \n" +
            "after line"

    fmt.Print(multiline) // New lines as interpreted \n
}

回答5:

Go and multiline strings

Using back ticks you can have multiline strings:

package main

import "fmt"

func main() {

    message := `This is a 
Multi-line Text String
Because it uses the raw-string back ticks 
instead of quotes.
`

    fmt.Printf("%s", message)
}

Instead of using either the double quote (“) or single quote symbols (‘), instead use back-ticks to define the start and end of the string. You can then wrap it across lines.

If you indent the string though, remember that the white space will count.

Please check the playground and do experiments with it.

回答6:

You can put content with `` around it, like

var hi = `I am here,
hello,
`

回答7:

You have to be very careful on formatting and line spacing in go, everything counts and here is a working sample, try it https://play.golang.org/p/c0zeXKYlmF

package main

import "fmt"

func main() {
    testLine := `This is a test line 1
This is a test line 2`
    fmt.Println(testLine)
}

回答8:

you can use raw literals. Example

s:=`stack
overflow`

回答9:

For me this is what I use if adding \n is not a problem.

fmt.Sprintf("Hello World\nHow are you doing today\nHope all is well with your go\nAnd code")

Else you can use the raw string

multiline := `Hello Brothers and sisters of the Code
              The grail needs us.
             `

来源：https://stackoverflow.com/questions/7933460/how-do-you-write-multiline-strings-in-go

标签

string

multiline