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如何根据来自 csv 的列中的多个描述符提取行数,然后使用 bash/python 脚本导出输出新的 csv?

[英]How to extract row counts based on multiple descriptors in a columns from csv and then export output a new csv using bash/python script?

我正在使用包含如下数据的 csv 文件(100 行)。 我想以 csv/tab 格式获取每个元素的每个基因的计数。

输入

    Gene     Element   
 ---------- ---------- 
  STBZIP1    G-box     
  STBZIP1    G-box     
  STBZIP1    MYC       
  STBZIP1    MYC       
  STBZIP1    MYC       
  STBZIP10   MYC       
  STBZIP10   MYC       
  STBZIP10   MYC       
  STBZIP10   G-box     
  STBZIP10   G-box     
  STBZIP10   G-box     
  STBZIP10   G-box     

预期输出

    Gene     G-Box   MYC  
 ---------- ------- ----- 
  STBZIP1        2     3  
  STBZIP10       4     3  

有人可以帮我在这方面想出一个bash脚本(或python)吗?

更新

我正在尝试以下操作并暂时卡住:| ;

import pandas as pd
df = pd.read_csv("Promoter_Element_Distribution.csv")
print (df)
df.groupby(['Gene', 'Element']).size().unstack(fill_value=0)

使用表单中的文件(此处命名为input.csv ):

    Gene     Element   
 ---------- ---------- 
  STBZIP1    G-box     
  STBZIP1    G-box     
  STBZIP1    MYC       
  STBZIP1    MYC       
  STBZIP1    MYC       
  STBZIP10   MYC       
  STBZIP10   MYC       
  STBZIP10   MYC       
  STBZIP10   G-box     
  STBZIP10   G-box     
  STBZIP10   G-box     
  STBZIP10   G-box

这个

import pandas as pd

df = pd.read_csv('input.csv', delim_whitespace=True, skiprows=1)
df.columns = ['Gene', 'Element']
df['Count'] = 1
df = df.pivot_table(index='Gene', columns='Element', aggfunc=sum)
print(df)

给你

         Count    
Element  G-box MYC
Gene              
STBZIP1      2   3
STBZIP10     4   3

由于您还要求提供 bash 版本,因此这里使用awk 1 它被注释了,而且输出的格式也“很好”,所以代码有点大(大约 20 行没有注释)。

awk '# First record line:
     # Storing all column names into elements, including
     # the first column name
     NR == 1 {firstcol=$1;element[$1]++}

     # Each line starting with the second one are datas
     # Occurrences are counted with an indexed array
     # count[x][y] contains the count of Element y for the Gene x
     NR > 2 {element[$2]++;count[$1][$2]++} 

     # Done, time for displaying the results
     END {
       # Let us display the first line, column names
       ## Left-justify the first col, because it is text
       printf "%-10s ", firstcol
       ## Other are counts, so we right-justify
       for (i in element) if (i != firstcol) printf "%10s ", i
       printf "\n"
       
       # Now an horizontal bar
       for (i in element) {
           c = 0
       while (c++ < 10) { printf "-"}
       printf " ";
       } 
       printf "\n"

       # Now, loop through the count records
       for (i in count) {
         # Left justification for the column name
         printf "%-10s ", i ;
         for(j in element)
           # For each counted element (ie except the first one),
           # print it right-justified
           if (j in count[i]) printf "%10s", count[i][j]
         printf "\n"
       }
     }' tab-separated-input.txt

结果:

Gene            G-box        MYC 
---------- ---------- ---------- 
STBZIP10            4         3
STBZIP1             2         3

1此解决方案需要GNU awk来处理数组数组( count[$1][$2]语法) - 感谢Ed Morton

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