How to write multiple strings in one line?

Question

I\'ve started to learn Python with LPTHW and I\'ve gotten to exercise 16:

http://learnpythonthehardway.org/book/ex16.html

And feel like an idiot because I ca

Answer 1

Here's one way:

target.write(line1 + '\n' + line2 + '\n' + line3 + '\n')

The reason the following doesn't work

target.write(line1 \n, line2 \n, line3 \n)

Is that line1 is a variable (note it's not quoted) but '\n' is a string literal (since it's in quotes). The addition operator is overloaded for strings to concatenate (combine) them.

The reason this doesn't work:

target.write('line1 \n, line2 \n, line3 \n')

Is because line1 is a variable. When you put it in quotes, it's no longer treated as a variable.

Answer 2

The author suggested using the formats, the strings and the escapes, so the following works. This implements Python's f-strings:

target.write(f"{line1} \n{line2} \n{line3} \n")

Answer 3

Your last try looks promising. It should look like:

"%s \n %s \n %s" % (line1, line2, line3)

this applies the operator % to a string (with 3 %s placeholders) and a tuple of values to substitute (here, strings). The result is the formatted string.

So you'd need to wrap that in the function which takes the result:

target.write("%s \n %s \n %s" % (line1, line2, line3) )

Answer 4

This info was really helpful. I got the right results by doing the following:

target.write(line1 + "\n" + line2 + "\n" + line3 + "\n")

The idea of concatenating would never have occurred to me.

Answer 5

below line works for me,

 target.write(line1 + line + line2 + line + line3 + line)

Before that i added

 line = '\n'

my code like:

 from sys import argv
 script, filename = argv
 print 'Appending process starts on: %r' % filename
 target = open(filename, 'a')
 print 'Enter the contents:\t'
 line1 = raw_input('Next:\t')
 line2 = raw_input('Next:\t')
 line3 = raw_input('Next:\t')
 line = '\n'
 target.write(line1 + line + line2 + line + line3 + line)
 print 'Thank you !'

Answer 6

This worked for me.

target.write("line1\nline2\nline3\n")

Also, the keyword which made it clicked for me was mentioned by Ewart, "'\n' only make sense inside a string literal."