本博文将使用python对长度单位、时间单位、重量单位、字节单位等实现单位换算。

1、长度单位

示例代码：

import re


def length_conversion(num: str, unit: str = 'm'):
    """长度单位由大到小包括：千米(km)、米(m)、分米(dm)、厘米(cm)、毫米(mm)"""
    dic_conversion = {'km': 1000 * 10 * 10 * 10, 'm': 10 * 10 * 10, 'dm': 10 * 10, 'cm': 10, 'mm': 1}
    try:
        unit_name = re.findall(r"[^\d].*", num)[0].strip().lower()  # 匹配不以数字开头的字符串
        num_value = int(re.findall(f"\d*", num)[0])
    except Exception as e:
        print(e)
        return f"您输入的数值：{num}格式错误！"
    if unit_name.lower() not in ['km', 'm', 'dm', 'cm', 'mm']:
        return f"您输入的数值：{num}格式错误！"
    if unit_name == 'km':
        mm_value = num_value * dic_conversion['km']
    elif unit_name == 'm':
        mm_value = num_value * dic_conversion['m']
    elif unit_name == 'dm':
        mm_value = num_value * dic_conversion['dm']
    elif unit_name == 'cm':
        mm_value = num_value * dic_conversion['cm']
    else:
        mm_value = num_value
    return mm_value / dic_conversion[unit]


if __name__ == '__main__':
    num = '65Km'
    res = length_conversion(num, 'm')
    print(res, type(res))
    print(length_conversion('65m'))
    print(length_conversion('65dm'))
    print(length_conversion('65cm'))
    print(length_conversion('65mm'))

运行结果：

2、时间单位

示例代码：  【年月转换目前存在问题】

import re


def time_conversion(num: str, unit: str = 's'):
    """时间单位由大到小包括：年(year)、月(month)、日(day)、时(hour)、分(minute)、秒(second)"""
    """一月默认30天计算，一年365年"""
    tips = '年(year)、月(month)、日(day)、时(hour)、分(minute)、秒(second)'
    dic_conversion = {'year': 365 * 24 * 60 * 60, 'month': 30 * 24 * 60 * 60, 'day': 24 * 60 * 60, 'hour': 60 * 60, 'minute': 60, 'second': 1}
    try:
        unit_name = re.findall(r"[^\d].*", num)[0].strip().lower()  # 匹配不以数字开头的字符串
        num_value = int(re.findall(f"\d*", num)[0])
    except Exception as e:
        print(e)
        return f"您输入的数值：{num}格式错误！请参考：{tips}"
    if unit_name.lower() not in ['year', 'month', 'day', 'hour', 'minute', 'second']:
        return f"您输入的数值：{num}格式错误！请参考：{tips}"
    if unit_name == 'year':
        mm_value = num_value * dic_conversion['year']
    elif unit_name == 'month':
        mm_value = num_value * dic_conversion['month']
    elif unit_name == 'day':
        mm_value = num_value * dic_conversion['day']
    elif unit_name == 'hour':
        mm_value = num_value * dic_conversion['hour']
    elif unit_name == 'minute':
        mm_value = num_value * dic_conversion['minute']
    else:
        mm_value = num_value
    return mm_value / dic_conversion[unit]


if __name__ == '__main__':
    num = '2year'
    res = time_conversion(num, 'day')
    print(res, type(res))
    print(time_conversion('2day', 'second'))
    print(time_conversion('2hour', 'second'))
    print(time_conversion('2minute', 'second'))
    print(time_conversion('2second', 'second'))

运行结果;

3、字节单位

示例代码：

import re


def bytes_conversion(num: str, unit: str = 'M'):
    """字节单位由大到小包括：B、K、M、G、T、P"""
    tips = 'K、M、G、T、P'
    dic_conversion = {'K': 1, 'M': 1024 ** 1, 'G': 1024 ** 2, 'T': 1024 ** 3, 'P': 1024 ** 4}
    try:
        unit_name = re.findall(r"[^\d].*", num)[0].strip().upper()[0]  # 匹配不以数字开头的字符串
        num_value = int(re.findall(f"\d*", num)[0])
    except Exception as e:
        print(e)
        return f"您输入的数值：{num}格式错误！请参考：{tips}"
    if unit_name not in ['B', 'K', 'M', 'G', 'T', 'P']:
        return f"您输入的数值：{num}格式错误！请参考：{tips}"
    if unit_name == 'P':
        mm_value = num_value * dic_conversion['P']
    elif unit_name == 'T':
        mm_value = num_value * dic_conversion['T']
    elif unit_name == 'G':
        mm_value = num_value * dic_conversion['G']
    elif unit_name == 'M':
        mm_value = num_value * dic_conversion['M']
    else:
        mm_value = num_value
    return mm_value / dic_conversion[unit[0].upper()]


if __name__ == '__main__':
    num = '2GB'
    res = bytes_conversion(num, 'm')
    print(res, type(res))
    print(bytes_conversion('1024m', 'GB'))
    print(bytes_conversion('1m', 'K'))

运行结果;