将二进制数（由符号、尾数和指数组成）转换为 python 中的十进制数

Question

I have some 32bits binary numbers. I want to convert them to decimal form. does exist any built-in function or general solution for this task? The following image shows an example.

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Answer 1

You can use struct module.

import struct
def bin_to_float(binary):
    return struct.unpack('!f',struct.pack('!I', int(binary, 2)))[0]

print(bin_to_float("11000011011110001100000000000000"))
##Output -248.75

Answer 2

Working from:

What's the correct way to convert bytes to a hex string in Python 3?

In [54]: bytes.fromhex('c378c000')                                                                     
Out[54]: b'\xc3x\xc0\x00'
In [55]: np.frombuffer(bytes.fromhex('c378c000'), '>f4')                                               
Out[55]: array([-248.75], dtype=float32)

np.float32 is IEEE 754 format.