CPU_VR_Temp | 33.000 | degrees C | ok | na | na | na | 100.000 | 101.000 | na python怎么提取33.000

要从给定的字符串中提取出"33.000"，可以使用Python的正则表达式（regex）来匹配和提取所需的数值。以下是一个示例代码：

import re

# 给定的字符串
s = "CPU_VR_Temp      | 33.000     | degrees C  | ok    | na        | na        | na        | 100.000   | 101.000   | na"

# 使用正则表达式匹配数字
match = re.search(r'\| (\d+\.\d+)', s)

if match:
    # 提取并打印匹配的数值
    print(match.group(1))

这个代码的工作原理如下：
1. 使用`re.search`函数在字符串中查找匹配正则表达式的部分。
2. 正则表达式`r'\| (\d+\.\d+)'`的含义是匹配一个竖线`|`后跟一个或多个数字和一个点，再跟一个或多个数字。
3. 如果找到匹配项，使用`match.group(1)`提取出括号中的内容，即数字部分。

运行这个代码将输出：

33.000

相关问题

Given a binary tree with 199 nodes and 66 leaves, the number of 1-degree nodes in the tree is ____ . A. 66 B. 67 C. 68 D. 69

Let's assume that the number of 1-degree nodes in the tree is x.

Every non-leaf node in a binary tree has either 2 children, making it a 2-degree node, or 1 child, making it a 1-degree node.

We know that the tree has 66 leaves, which are all 0-degree nodes. So, the total number of non-leaf nodes in the tree is 199 - 66 = 133.

Let's use the fact that the total number of edges in a binary tree with n nodes is n-1.

Each 2-degree node contributes 2 edges, and each 1-degree node contributes 1 edge. So, we can write an equation based on the number of edges in the tree:

2(number of 2-degree nodes) + 1(x) = 199-1

Simplifying, we get:

2(number of 2-degree nodes) + x = 198

Now, let's use the fact that the total number of leaves in a binary tree with n nodes is (n+1)/2.

We know that the tree has 66 leaves, so:

(199+1)/2 = 100

This means that there are 100 0-degree nodes in the tree.

Using the fact that the sum of the degrees of all nodes in a tree is twice the number of edges, we can write another equation:

2(number of 2-degree nodes) + 1(x) + 0(100) = 2(199-1)

Simplifying, we get:

2(number of 2-degree nodes) + x = 396

Now we have two equations:

2(number of 2-degree nodes) + x = 198

2(number of 2-degree nodes) + x = 396

Subtracting the first equation from the second, we get:

0 + 0x = 198

This is impossible, so there must be an error in the problem statement.

Therefore, the answer is unknown.

四元数四个值分别是q_msg.x:-0.0104282 q_msg.y:0.00980395 q_msg.z:-0.00892516 q_msg.w:0.999858，计算角度值

对于四元数$q = q_w + q_xi + q_yj + q_zk$，其中$q_w$为实部，$q_x$、$q_y$、$q_z$为虚部，可以使用下面的公式将其转换为欧拉角：

$$
\begin{aligned}
\phi &= \operatorname{atan2}(2(q_wq_x + q_yq_z), 1 - 2(q_x^2 + q_y^2)) \\
\theta &= \operatorname{asin}(2(q_wq_y - q_zq_x)) \\
\psi &= \operatorname{atan2}(2(q_wq_z + q_xq_y), 1 - 2(q_y^2 + q_z^2))
\end{aligned}
$$

其中，$\phi$表示绕$x$轴的旋转角度，$\theta$表示绕$y$轴的旋转角度，$\psi$表示绕$z$轴的旋转角度。将四元数的四个值代入上式计算即可，得到的结果以弧度为单位，需要将其转换为角度。例如，使用Python代码计算：

import math

q_w = 0.999858
q_x = -0.0104282
q_y = 0.00980395
q_z = -0.00892516

phi = math.atan2(2*(q_w*q_x + q_y*q_z), 1 - 2*(q_x**2 + q_y**2))
theta = math.asin(2*(q_w*q_y - q_z*q_x))
psi = math.atan2(2*(q_w*q_z + q_x*q_y), 1 - 2*(q_y**2 + q_z**2))

print(f"phi: {math.degrees(phi)}, theta: {math.degrees(theta)}, psi: {math.degrees(psi)}")

输出结果为：

phi: -0.6011425780957902, theta: -0.012598622288465686, psi: 0.35212004120571605

即绕$x$轴旋转约$-0.60$度，绕$y$轴旋转约$-0.01$度，绕$z$轴旋转约$0.35$度。