python中杂乱问题

1 字符串格式化中的格式指定

format_spec ::=  [[fill]align][sign][#][][width][,][.precision][type]
fill        ::=  <any character>
align       ::=  "<" | ">" | "=" | "^"
sign        ::=  "+" | "-" | " "
width       ::=  integer
precision   ::=  integer
type        ::=  "b" | "c" | "d" | "e" | "E" | "f" | "F" | "g" | "G" | "n" | "o" | "s" | "x" | "X" | "%"

详细信息请转官网

2 查看字符的各种编码方法使用repr

In []: a=u"啊"

In []: repr(a)
Out[]: "u'\\u554a'"

In []: b = a.encode("utf-8")

In []: repr(b)
Out[]: "'\\xe5\\x95\\x8a'"

In []: c = a.encode("gbk")

In []: repr(c)
Out[]: "'\\xb0\\xa1'"