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生物信息学-linux及Ubuntu22基础-2

  • 2026-03-22 08:40:18
生物信息学-linux及Ubuntu22基础-2

jupyter notebook

打开Ubuntu,输入 conda activate bioinfo,已进入环境,包会装到这个环境,且不污染系统

测试环境

退出python 可以输入exit()或者按ctrl+D,就会回到linux

练习:运用python画一张基因表达图,读取一个RNA-seq表达矩阵并画图

第一步退出python交互模式

第二步,安装今天要用的包

在Ubuntu输入conda install pandas numpy matplotlib seaborn jupyter -y

conda :包管理器+环境管理器

conda install :用conda安装软件

pandas :数据处理库,读取数据表及处理矩阵,统计,清洗数据

numpy:科学计算库,用于数值计算,矩阵运算,数组

matplotlib :绘图库,画折线图,散点图,箱线图,热图

seaborn :高级绘图库,基于matplotlib,图更加漂亮,统计图更方便

jupyter :交互式编程环境,写代码,运行代码,显示图,写笔记

-y yes

第三步,输入jupyter notebook --no-browser

jupyter notebook 启动jupyter notebook服务器,即启动一个本地网页服务,可以在浏览器里写python,即jupyter实际上是python+浏览器的工作环境

no-browser:不要自动打开浏览器,因为目前在windows+WSL Ubuntu,如果不用这个参数,jupyter会尝试用linux浏览器打开,但是wsl没有浏览器,可能会报错

运行完后,复制网址地址至Edge浏览器打开,进入notebook,代码在linux运行,界面在windows浏览器显示

在new下面的python3打开,即看到写代码的地方

小型生信任务:读取数据,查看数据,画科研图

在jupyter notebook输入

首先输入

import pandas as pd

import numpy as np

import matplotlib.pyplot as plt

import seaborn as sns

解读:import pandas as pd :把pandas工具库加载到python里使用,且起个简称pd,以后用的时候直接写pd.read_csv()

其余同理

接着输入:

import seaborn as sns

df = sns.load_dataset("iris")

sns.boxplot(data=df, x="species", y="sepal_length")

代码解读:

import seaborn as sns:导入seaborn这个绘图库,并简称为sns,以后调用这个数据库就是sns.heatmap( ) ,  sns.scatterplot( ) ,  sns.boxplot( )

df = sns.load_dataset("iris") :  sns.load_dataset(“iris”)是seaborn自带的一个示例数据集,iris是一个经典的生物学数据,这一部分的意思是把数据存到变量df里,df通常代表DataFrame(数据表),总得意思就是把iris数据集读进来,存成一个数据表df

sns.boxplot(data=df, x="species", y="sepal_length")

用seaborn画一个箱线图(boxplot),x轴是花的种类,y轴是花萼长度

模拟差异表达基因热图

第一步,确保导入库,先运行

import pandas as pd

import numpy as np

import seaborn as sns

import matplotlib.pyplot as plt

第二步,创建一个模拟的RNA-seq数据

data = {

    "gene": ["TP53", "MYC", "GAPDH", "ACTB", "BRCA1"],

    "Ctrl_1": [120, 500, 1000, 900, 200],

    "Ctrl_2": [135, 480, 980, 920, 210],

    "Treat_1": [300, 200, 1100, 850, 400],

    "Treat_2": [280, 220, 1080, 870, 390]

}

df = pd.DataFrame(data)

df = df.set_index("gene")

代码解读:df =pd.DataFrame(data),把data这个python 字典转换成表格数据(DataFrame)

DataFrame:类似Excel的表格结构

df =df.set_index(“gene”):是把gene这一列变成行标签index

原因:表达矩阵的标准格式就是gene×sample

第三步,做log转换:让数据更容易画图

df_log = np.log2(df + 1)

df_log

代码解读:df_log = np.log2(df + 1),给所有表达量加1,再做log2转换

选择log2的原因是RNA-seq表达量分布非常不均匀,做了log2转换后,差距不会那么夸张,加1是因为如果表达量为0,log2(0)是不存在的。这也是为什么论文中热图颜色范围大多是-2  -1  0  1  2 ,而不是原始表达量

df_log:显示转换后的表达矩阵

第四步,画热图

plt.figure(figsize=(6,4))

sns.heatmap(df_log, cmap="coolwarm")

plt.title("RNA-seq Expression Heatmap")

plt.show()

代码解读:plt.figure(figsize=(6,4))  创建一个画布(图像窗口),plt是matplotlib画图工具的简称,figure()创建一张新的图,figsize=(6,4)图像大小是宽=6,高=4,单位是英寸(inch)

sns.heatmap(df_log, cmap="coolwarm"):sns是统计绘图库,heatmap是热图,不同数值代表不同颜色,画出颜色矩阵,df-log=np.log2(df+1),热图用的是log2表达量,cmap="coolwarm"是颜色方案,coolwarm表示蓝色-低表达,白色-中等,红色-高表达,其余常见配色有viridis, magma,  plasma, RdBu

plt.title("RNA-seq Expression Heatmap"):绘图添加标题

plt.show():把图真正显示出来

真正的RNA-seq热图会多两步,即Z-score标准化,不同基因表达范围统一,第二就是聚类(基因聚类,样本聚类)

结果展示:

插曲:

遇到的一个 Jupyter Notebook 的常见 WSL 问题:

File Save Error for Untitled.ipynb Failed to fetch,意思是浏览器和 Jupyter 服务器的连接 断开了,所以 Notebook 无法保存,也无法正常运行代码。这不是代码问题,而是 Jupyter 会话断开了。

解决办法:回到Ubuntu终端,先按ctrl+C,Shutdown this notebook server (y/[n])?,输入y,然后回车,再重启jupyter,在终端输入jupyter notebook ,再重新打开网页,新建一个notebook,继续运行代码,更稳定的习惯jupyter notebook --no-browser --port=8888,重新关掉打开也行。

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  1. CONNECT:[ UseTime:0.001051s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001669s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000730s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000653s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001216s ]
  6. SELECT * FROM `set` [ RunTime:0.000597s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001463s ]
  8. SELECT * FROM `article` WHERE `id` = 479112 LIMIT 1 [ RunTime:0.004750s ]
  9. UPDATE `article` SET `lasttime` = 1774576640 WHERE `id` = 479112 [ RunTime:0.010753s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.003568s ]
  11. SELECT * FROM `article` WHERE `id` < 479112 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001247s ]
  12. SELECT * FROM `article` WHERE `id` > 479112 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001146s ]
  13. SELECT * FROM `article` WHERE `id` < 479112 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.009328s ]
  14. SELECT * FROM `article` WHERE `id` < 479112 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002153s ]
  15. SELECT * FROM `article` WHERE `id` < 479112 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.006665s ]
0.198202s