在'％'中：数组不能被强制转换为Fixnum（TypeError）试图减少Ruby代码行

Question

使用target.write：

尝试将5行减少为1时出现上述错误

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

已评论的部分已运行（当第一行为target.write(line1)时，但这不是。

为什么第一行与编写注释掉的六行不一样？这是整个剧本：

filename = ARGV.first
script = $0

puts "We're going to erase #{filename}."
puts "If you don't want that hit control C"
puts "If you do want that hit execute or return"

print "? "
STDIN.gets

puts "Opening the file..."
target = File.open(filename, 'w')

puts "Truncating the file. Goodbye!"
target.truncate(target.size)

puts "Now I'm going to ask you for three lines."

print "line1: "; line1 = STDIN.gets.chomp()
print "line2: "; line2 = STDIN.gets.chomp()
print "line3: "; line3 = STDIN.gets.chomp()

puts "I'm going to write these to the file."

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

puts "And finally we close it"
target.close()  

Answer 1

target.write行的关闭位置错误。尝试

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

Answer 2

你的括号错了。你有什么：

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

等同于：

a = target.write("%s \n %s \n %s \n")
a % [line1, line2, line3]

因此你想要的是：

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