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自学Python --Day1,Numpy

  • 2026-07-01 05:29:27
自学Python --Day1,Numpy
在服务器中已创建了jupyter环境jupyter_env，保持jupyter的后台运行
cd /data2/hjl/jupyter/   #到jupyter根目录nohup jupyter notebook >jupyter.log &
从powershell登录服务器
ssh -L 8888:localhost:8888 xxxxx@xxxxxx

然后从本地电脑打开浏览器http://localhost:8888

今天学习了用numpy创建dataframe
import numpy as npgenes = ["GeneA","GeneB","GeneC","GeneD","GeneE"]samples= ["sample1","sample2","sample3","sample4"]np.random.seed(1212)data= np.random.randint(50,200,size=(len(genes),len(samples)))# 构造dataframedf= pd.DataFrame(data, index=genes, columns=samples)print(df)

筛选

df[df['sample1']>150] #筛选sample1表达量>150的
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  1. CONNECT:[ UseTime:0.000957s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001560s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.002802s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.006980s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001298s ]
  6. SELECT * FROM `set` [ RunTime:0.006279s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001506s ]
  8. SELECT * FROM `article` WHERE `id` = 493092 LIMIT 1 [ RunTime:0.015771s ]
  9. UPDATE `article` SET `lasttime` = 1783087043 WHERE `id` = 493092 [ RunTime:0.008875s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000684s ]
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