#format

说明：格式化（调用对象的 __format__ 方法）。

def format(value, format_spec=''):
    '''
    类型转换为 format

    :param value: 一个变量
    :param format_spec: 格式
    :return: 转换为 format 后的值
    '''

示例：

# 数字格式化
print(format(3.14159, ".2f"))  # 输出: '3.14'
print(format(1000000, ","))    # 输出: '1,000,000'

# 对齐和填充
print(format("hello", "^10"))   # 输出: '  hello   ' (居中对齐，宽度10)
print(format(42, "05d"))       # 输出: '00042' (用0填充，宽度5)

# 进制转换
print(format(10, "b"))         # 输出: '1010' (二进制)
print(format(255, "x"))        # 输出: 'ff' (十六进制小写)
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#格式

format_spec ::= [options][width][grouping]["." precision][type]
options     ::= [[fill]align][sign]["z"]["#"]["0"]
fill        ::= <any character>
align       ::= "<" | ">" | "=" | "^"
sign        ::= "+" | "-" | " "
width       ::= digit+
grouping    ::= "," | "_"
precision   ::= digit+
type        ::= "b" | "c" | "d" | "e" | "E" | "f" | "F" | "g"
                | "G" | "n" | "o" | "s" | "x" | "X" | "%"

#对齐选项

#符号选项

#分隔选项

#整数选项

#浮点数选项