field_name ::= arg_name ("." attribute_name | "[" element_index "]")* arg_name ::= [identifier | integer] attribute_name ::= identifier element_index ::= integer | index_string index_string ::= <any source character except "]"> + conversion ::= "r" | "s" | "a" format_...
FormatFunction类和ZfillMethod类是String类的方法,分别表示format()函数和zfill()方法。StrFunction类和IntFunction类是Integer类的方法,分别表示str()函数和int()函数。FormatMethod类是Integer类的方法,表示format()方法。 序列图 下面是一个使用Mermaid语法绘制的序列图,展示了Python中字符串插值的过程: FormatFunction...
arg_name ::= [identifier | integer] attribute_name ::= identifier element_index ::= integer | index_string index_string ::= <any source character except "]"> + conversion ::= "r" | "s" | "a" format_spec ::= <described in the next section> 针对format_spec 的用法如下 format_spe...
string.printable:包含所有可打印的ASCII字符的字符串。 string.punctuation:包含所有ASCII标点字符的字符串。 string.ascii_uppercase:包含所有大写ASCII字母的字符串。虽然说的是ASCII字符,但值实际上是未解码的Unicode字符串。 string.capwords(s[, sep]) 使用split根据sep拆分s,将每项的首字母大写,再以SPLIT为分隔...
format string = string literals + replacement fields 格式字符串(format string) 由 字符串字面量(string literals) 或 替代字段(replacement fields)构成。 替代字段(replacement field)是由一对花括号括起来的内容; 非替代字段的字符都被作为字符串字面量(string literals); ...
#precision ::= integer 小数位数 #type ::= "b" | "c" | "d" | "e" | "E" | "f" | "F" | "g" | "G" | "n" | "o" | "s" | "x" | "X" | "%" 类型 s="This is a test string"; print("{0}".format(s)); ...
"{" [[identifier | integer]("." identifier | "[" integer | index_string "]")*]["!" "r" | "s" | "a"] [":" format_spec] "}" 其中,用来控制参数显示时的格式,包括:,<.精度>6 个字段,这些字段都是可选的,可以组合使用,逐一介绍如下。
Note:Left alignment filled with zeros for integer numbers can cause problems as the 3rd example which returns 12000, rather than 12. String formatting with format() As numbers, string can be formatted in a similar way withformat(). Example 6: String formatting with padding and alignment ...
element_index ::= integer | index_string index_string ::= <any source character except “]”> + conversion ::= “r” | “s” | “a” format_spec ::= <described in the next section> format_spec 的格式 format_spec ::= [[fill]align][sign][#][0][width][,][.precision][type]...
#摘自python官方文档 format_spec::=[[fill]align][sign][#][0][width][,][.precision][type]fill::=<any character>align::="<"|">"|"="|"^"sign::="+"|"-"|" "width::=integer precision::=integertype::="b"|"c"|"d"|"e"|"E"|"f"|"F"|"g"|"G"|"n"|"o"|"s"|"x"|...