Python中的JavaScript toString（16）用于浮点数？答案

【问题标题】：JavaScript toString(16) in Python for floats?Python中的JavaScript toString（16）用于浮点数？
【发布时间】：2020-08-22 14:40:27
【问题描述】：

我正在尝试将以下 JavaScript 代码转换为 Python：

var n = 0.3846705659431655
n.toString(16)

result: "0.6279c52c75af6"

我现在面临的挑战是我似乎无法在 Python 中转换浮点数。它会给我带来错误或给我不同的结果。

示例：

n = 0.3846705659431655
float.hex(n)

result: 0x1.89e714b1d6bd8p-2
expected result: "0.6279c52c75af6"

还有其他方法可以让我在 Python 中获得相同的结果吗？

【问题讨论】：

嗨@cryptocake，欢迎来到SO！哪个 Python 版本？
嗨@CarloZanocco 谢谢！我在 Windows 上使用 Python 3.7.5 版。

标签： javascript python tostring

【解决方案1】：

我正在使用 Python 3.8，但它应该也适合你。

def FloatToHex(number, base = 16):
    if number < 0:                          # Check if the number is negative to manage the sign
        sign = "-"                          # Set the negative sign, it will be used later to generate the first element of the result list
        number = -number                    # Change the number sign to positive
    else:
        sign = ""                           # Set the positive sign, it will be used later to generate the first element of the result list

    s = [sign + str(int(number)) + '.']     # Generate the list, the first element will be the integer part of the input number
    number -= int(number)                   # Remove the integer part from the number

    for i in range(base):                   # Iterate N time where N is the required base
        y = int(number * 16)                # Multiply the number by 16 and take the integer part
        s.append(hex(y)[2:])                # Append to the list the hex value of y, the result is in format 0x00 so we take the value from postion 2 to the end
        number = number * 16 - y            # Calculate the next number required for the conversion

    return ''.join(s).rstrip('0')           # Join all the list values and return the converted number

n = 0.3846705659431655
print(FloatToHex(n))

结果0.6279c52c75af6

【讨论】：