在python中使用格式化打印的双引号和单引号

所以我正在经历"以艰难的方式学习Python"

而这样做:

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

print formatter % (
    "I had this thing.",
    "That you could up right.",
    "But it didn't sing.",
    "So I said goodnight"
)

输出是

'I had this thing.' 'That you could up right.' "But it didn't sing." 'So I said goodnight'

但我不确定为什么第3个字符串有双字符串.

"a"并且'a'是相同的字符串,没有区别.

第三个字符串包含一个撇号,因此它不能表示为'But it didn't sing.'因为它会在字符串之后结束didn并引发一个SyntaxError.

如果要表示带单引号的字符串,可以执行以下操作:

"'"

要么

'\''

双引号相同:

'"'

要么

"\""

如果你有一个带两个引号的字符串,你可以选择一个:

'"\'"

要么

"\"'"