将套接字接收的字节转换为Python 3中的float
[英]Convert bytes received by socket to float in Python 3
问题描述
I've tried following the suggested answer here but did not get the intended result: Python Socket Received ASCII convert to actual numbers (float) 
我尝试按照此处建议的答案进行操作，但未获得预期的结果： Python套接字收到的ASCII转换为实际数字（浮点数）
I'm receiving data in bytes format like so, using socket.recv(): 我正在使用socket.recv（）接收字节格式的数据：
b'(1,3,-121.551552,-123.602531,-40.582172,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0)'
I'm trying to receive the values above as a list of 30 floats. 我正在尝试接收上述值作为30个浮点数的列表。
I understand we have to use the struct library but I'm facing difficulties trying to grasp the concept of formatting. 我知道我们必须使用struct库，但是在尝试掌握格式概念时遇到了困难。
1 个解决方案
解决方案1
0 2018-11-20 04:26:50
Your incoming floats aren't fixed-length, apart from having 6 decimal paces, if at all. 除了有6个小数步长之外，传入的浮点数不是固定长度的。 So why not just use bytes.decode() , then strip off the brackets and then split on commas? 那么，为什么不只使用bytes.decode() ，然后bytes.decode()括号，然后以逗号分隔呢？
With each step broken down: 每个步骤都需要分解：
>>> b = b'(1,3,-121.551552,-123.602531,-40.582172,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0)'
>>> b.decode()
'(1,3,-121.551552,-123.602531,-40.582172,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0)'
>>> b.decode()[1:-1]
'1,3,-121.551552,-123.602531,-40.582172,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0'
>>> b.decode()[1:-1].split(',')
['1', '3', '-121.551552', '-123.602531', '-40.582172', '0', '0', '0', '0', '0', '0', '0',
'0', '0', '0', '0', '0', '0', '0', '0', '0', '0', '0', '0', '0', '0', '0', '0', '0', '0']
>>> [float(x) for x in b.decode()[1:-1].split(',')]
[1.0, 3.0, -121.551552, -123.602531, -40.582172, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0,
0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0,
0.0, 0.0, 0.0, 0.0]
And a more Pythonic way to do that last one-step: 最后一步的一种更Python化的方法：
>>> list(map(float, b.decode()[1:-1].split(',')))
[1.0, 3.0, -121.551552, -123.602531, -40.582172, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0,
0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0]
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