字符串什么时候用双引号输出？什么时候用单引号输出？by %r

Question

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

Answer 1

str.__repr__更喜欢单引号，除非字符串包含单引号且没有双引号，在这种情况下它使用双引号。

Answer 2

Just use format() function, don't care %r ,single,double,triple quotes.

formatter= "{} {} {} {}"
print ((formatter).format (
    "I had this thing.",
    "That you could type up right.",
    "But it didn't sing.",
    "so I said goodnight."))

Output:

    >>>
    I had this thing. That you could type up right. But it didn't sing. so I said goodnight.
    >>>