用字符串写多行文字

Question

Assume we want to have a string of this form:

a b c
d e f
g h i

I don't have access to all lines at one time and I get them one by one in different parts of my code. So, I want to have a string and update the string when I have a new line to write there.

I can write each line in a string, but when I use "\\n" to go the next line like this

str = "a b c" + "\n" + "d e f" + "\n" + "g h i" 
str

this is the output:

'a b c\nd e f\ng h i'

Any idea for making the output correct?

Answer 1

If you're just trying to print it, this seems to work for me.

print("a b c \nd e f \ng h i")

Hope that helps.

Answer 2

Simple solution is three quotes.

string="""a b c
d e f
g h i"""

print(string)

Answer 3

When you type a variable name in the python shell, it returns the value of that variable. In your case, the value of str does have embedded \\n in it. (As you know from the way you're using it, a string can have any number of newlines in it.) The shell is displaying the raw value of the string.

If you do anything with that string, however, you'll see the newlines behaving as you expect them to.

For example, print(str) outputs the string formatted in the way you expect it to be.

Similarly,

with open("myfile.txt", "w") as myfile:
    myfile.write(str)

will produce a file called myfile.txt with the three lines that you want to see in it.