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Python 内置函数系列:o开头系列函数

  • 2026-01-25 12:33:19
Python 内置函数系列:o开头系列函数

object:所有类的"终极基类"

1. 基础特性:Python的类基础

object类是所有Python类的基类,提供了所有类实例共有的基本方法。当其构造器被调用时,它将返回一个新的基本对象。该构造器不接受任何参数。

# 创建基础对象实例
base_obj = object()
print
(f"对象类型: {type(base_obj)}")  # 输出: <class 'object'>
print
(f"对象标识: {id(base_obj)}")
print
(f"对象哈希: {hash(base_obj)}")

oct():八进制转换的"翻译器"

1. 基础用法:整数转八进制字符串

oct()函数将整数转换为带"0o"前缀的八进制字符串,是进制转换的重要工具。

# 基本八进制转换
print
(f"8的八进制: {oct(8)}")      # 输出: '0o10'
print
(f"10的八进制: {oct(10)}")    # 输出: '0o12'
print
(f"16的八进制: {oct(16)}")    # 输出: '0o20'

# 负数转换

print
(f"-56的八进制: {oct(-56)}")  # 输出: '-0o70'
print
(f"0的八进制: {oct(0)}")      # 输出: '0o0'

# 大整数转换

large_num = 2**20
print
(f"2^20的八进制: {oct(large_num)}")

# 从十六进制数转换

hex_num = 0xFF
print
(f"0xFF的八进制: {oct(hex_num)}")  # 输出: '0o377'

# 使用__index__方法的对象

class
 IndexableNumber:
    def
 __index__(self):
        return
 100

custom_obj = IndexableNumber()
print
(f"自定义对象转换: {oct(custom_obj)}")  # 输出: '0o144'

2. 实际应用:文件权限和进制转换工具

class PermissionConverter:
    """权限转换工具类(常用于Linux文件权限)"""


    @staticmethod

    def
 chmod_to_octal(permission_str):
        """将chmod权限字符串转换为八进制数字"""

        if
 len(permission_str) != 9:
            raise
 ValueError("权限字符串必须是9个字符")

        # 权限映射:r=4, w=2, x=1

        perms = {'r': 4, 'w': 2, 'x': 1, '-': 0}

        # 每3位一组转换为八进制

        result = 0
        for
 i in range(0, 9, 3):
            group = permission_str[i:i+3]
            value = 0
            for
 char in group:
                if
 char in perms:
                    value += perms[char]
                else
:
                    raise
 ValueError(f"无效权限字符: {char}")
            result = result * 10 + value  # 注意:这里构建的是十进制数,但每位代表八进制值

        return
 int(str(result), 8)  # 将字符串解析为八进制整数

    @staticmethod

    def
 octal_to_chmod(octal_permission):
        """将八进制权限转换为chmod字符串"""

        # 确保是有效的八进制权限(0-777)

        if
 not 0 <= octal_permission <= 0o777:
            raise
 ValueError("权限必须在0-777范围内")

        permission_str = ""
        # 转换为三位八进制字符串

        oct_str = oct(octal_permission)[2:].zfill(3)

        for
 digit in oct_str:
            value = int(digit, 8)
            # 转换为rwx格式

            bits = [
                'r'
 if value & 4 else '-',
                'w'
 if value & 2 else '-',
                'x'
 if value & 1 else '-'
            ]
            permission_str += ''.join(bits)

        return
 permission_str

    @staticmethod

    def
 format_octal_number(num, width=0, prefix=True):
        """格式化八进制输出"""

        if
 prefix:
            oct_str = oct(num)
        else
:
            oct_str = format(num, 'o')

        if
 width > 0:
            # 处理前缀

            if
 prefix and oct_str.startswith('0o'):
                oct_str = '0o' + oct_str[2:].zfill(width)
            elif
 prefix and oct_str.startswith('-0o'):
                oct_str = '-0o' + oct_str[3:].zfill(width)
            elif
 oct_str.startswith('-'):
                oct_str = '-' + oct_str[1:].zfill(width)
            else
:
                oct_str = oct_str.zfill(width)

        return
 oct_str

# 使用示例

converter = PermissionConverter()

# 文件权限转换

print
("=== 文件权限转换示例 ===")
permission_str = "rwxr-xr--"
octal_perm = converter.chmod_to_octal(permission_str)
print
(f"权限 '{permission_str}' -> 八进制: {oct(octal_perm)}")

# 反向转换

converted_back = converter.octal_to_chmod(octal_perm)
print
(f"八进制 {oct(octal_perm)} -> 权限: {converted_back}")

# 常见权限示例

common_permissions = {
    "完全开放"
: 0o777,    # rwxrwxrwx
    "用户读写执行,组只读,其他无"
: 0o740,  # rwxr-----
    "用户读写,组只读,其他只读"
: 0o644,   # rw-r--r--
    "仅用户读写"
: 0o600,    # rw-------
}

for
 name, perm in common_permissions.items():
    perm_str = converter.octal_to_chmod(perm)
    print
(f"{name}: {oct(perm)} -> {perm_str}")

# 八进制格式化

test_numbers = [8, 10, 16, 100]
for
 num in test_numbers:
    formatted = converter.format_octal_number(num, width=4, prefix=True)
    print
(f"{num} 的八进制: {formatted}")

ord():字符编码的"解码器"

1. 基础用法:获取字符的Unicode码位

ord()函数返回字符的Unicode码位(整数),是字符编码处理的基础。

# 基本ASCII字符
print
(f"'a'的码位: {ord('a')}")      # 输出: 97
print
(f"'A'的码位: {ord('A')}")      # 输出: 65
print
(f"'0'的码位: {ord('0')}")      # 输出: 48
print
(f"' '的码位: {ord(' ')}")      # 输出: 32(空格)

# 特殊字符

print
(f"'€'的码位: {ord('€')}")      # 输出: 8364(欧元符号)
print
(f"'中'的码位: {ord('中')}")    # 输出: 20013
print
(f"'☆'的码位: {ord('☆')}")      # 输出: 9734

# 控制字符

print
(f"'\\n'的码位: {ord('\\n')}")  # 输出: 10(换行符)
print
(f"'\\t'的码位: {ord('\\t')}")  # 输出: 9(制表符)

# 字节对象(单字节)

print
(f"b'a'的码位: {ord(b'a')}")    # 输出: 97
print
(f"b'\\x41'的码位: {ord(b'\\x41')}")  # 输出: 65(ASCII 'A')

# bytearray对象

ba = bytearray(b'X')
print
(f"bytearray的码位: {ord(ba)}")  # 输出: 88

2. 实际应用:字符编码分析和转换

class CharacterAnalyzer:
    """字符分析工具类"""


    @staticmethod

    def
 analyze_string(text):
        """分析字符串中所有字符的编码信息"""

        results = []
        for
 i, char in enumerate(text):
            code_point = ord(char)
            results.append({
                'index'
: i,
                'character'
: char,
                'codepoint'
: code_point,
                'hex'
: hex(code_point),
                'binary'
: bin(code_point),
                'category'
: CharacterAnalyzer.get_char_category(char)
            })
        return
 results

    @staticmethod

    def
 get_char_category(char):
        """获取字符类别"""

        code = ord(char)
        if
 0 <= code <= 31:
            return
 "控制字符"
        elif
 32 <= code <= 126:
            return
 "ASCII可打印字符"
        elif
 127 <= code <= 255:
            return
 "扩展ASCII"
        elif
 256 <= code <= 65535:
            return
 "基本多文种平面(BMP)"
        else
:
            return
 "补充平面"

    @staticmethod

    def
 string_to_codepoints(text, format='decimal'):
        """将字符串转换为码点序列"""

        codepoints = [ord(c) for c in text]

        if
 format == 'decimal':
            return
 codepoints
        elif
 format == 'hex':
            return
 [hex(cp) for cp in codepoints]
        elif
 format == 'binary':
            return
 [bin(cp) for cp in codepoints]
        else
:
            return
 codepoints

    @staticmethod

    def
 codepoints_to_string(codepoints):
        """将码点序列转换回字符串"""

        return
 ''.join(chr(cp) for cp in codepoints)

    @staticmethod

    def
 find_special_characters(text):
        """查找文本中的特殊字符"""

        special_chars = []
        for
 char in text:
            cp = ord(char)
            if
 cp < 32 or cp > 126:  # 非标准ASCII字符
                special_chars.append({
                    'char'
: char,
                    'codepoint'
: cp,
                    'representation'
: repr(char)
                })
        return
 special_chars

# 使用示例

analyzer = CharacterAnalyzer()

# 字符串分析

print
("=== 字符串编码分析 ===")
test_text = "Hello 世界! ☆"
analysis = analyzer.analyze_string(test_text)

for
 item in analysis:
    print
(f"位置 {item['index']}: '{item['character']}' -> "
          f"码点 {item['codepoint']}, 十六进制 {item['hex']}, "

          f"类别: {item['category']}"
)

# 码点转换

codepoints_decimal = analyzer.string_to_codepoints("ABC", format='decimal')
codepoints_hex = analyzer.string_to_codepoints("ABC", format='hex')
print
(f"字符串码点(十进制): {codepoints_decimal}")
print
(f"字符串码点(十六进制): {codepoints_hex}")

# 反向转换

original = analyzer.codepoints_to_string([72, 101, 108, 108, 111])
print
(f"码点转字符串: {original}")

# 查找特殊字符

text_with_special = "Hello\tWorld\n中国☆"
special = analyzer.find_special_characters(text_with_special)
print
(f"\n特殊字符查找:")
for
 item in special:
    print
(f"  字符: {item['representation']}, 码点: {item['codepoint']}")

总结

本文详细解析了Python中三个重要的内置功能:

  1. 1. object - 所有类的终极基类,基类设计、内存优化、不可变对象
  2. 2. oct(integer) - 八进制转换的翻译器,文件权限管理、进制转换、低级编程
  3. 3. ord(character) - 字符编码的解码器,字符编码分析、文本处理、国际化支持

关键知识点总结:

  • • object是所有Python类的基类,实例没有__dict__属性
  • • oct()将整数转换为带"0o"前缀的八进制字符串
  • • ord()返回字符的Unicode码位,支持字符串和字节对象

阅读推荐

Python 内置函数系列:m开头系列函数

Python 内置函数系列:l开头系列函数

Python 内置函数系列:i开头系列函数


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  1. CONNECT:[ UseTime:0.000414s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000729s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000293s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.001349s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000706s ]
  6. SELECT * FROM `set` [ RunTime:0.000540s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000627s ]
  8. SELECT * FROM `article` WHERE `id` = 467073 LIMIT 1 [ RunTime:0.007620s ]
  9. UPDATE `article` SET `lasttime` = 1770496031 WHERE `id` = 467073 [ RunTime:0.007242s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.007695s ]
  11. SELECT * FROM `article` WHERE `id` < 467073 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.010041s ]
  12. SELECT * FROM `article` WHERE `id` > 467073 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.014280s ]
  13. SELECT * FROM `article` WHERE `id` < 467073 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.057012s ]
  14. SELECT * FROM `article` WHERE `id` < 467073 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.026952s ]
  15. SELECT * FROM `article` WHERE `id` < 467073 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.088661s ]
0.295235s