Learn Python The Hard Way学习(8) - 打印，还是打印

formatter = "%r %r %r %r"

print formatter % (1, 2, 3, 4)
print formatter % ("one", "two", "three", "four")
print formatter % (True, False, False, True)
print formatter % (formatter, formatter, formatter, formatter)
print formatter % (
"I had this thing.",
"That you could type up right.",
"But it didn't sing.",
"So I said goodnight."
)

运行结果

1 2 3 4
'one' 'two' 'three' 'four'
True False False True
'%r %r %r %r' '%r %r %r %r' '%r %r %r %r' '%r %r %r %r'
'I had this thing.' 'That you could type up right.' "But it didn't sing." 'So I said goodnight.'

加分练习
1. 检查并记录自己的错误。
2. 注意最后一行，既有单引号又有双引号，它们是怎么工作的？
默认使用单引号，如果字符串中有单引号就使用双引号。如果字符串中有双引号，还是默认使用单引号。