python - 遍历 csv/xlsx 文件 python 3 中的行和列

Question

我是 Stack Overflow 的新手，有一个我无法解决的问题。 我有一个 csv 文件或 excel(基本上是一个表格)并想在 Python 3 中执行以下操作:

Column Header,"r269_d","r295_A","r295_R","r299_A","r325_D","r326_A"

id1,"0.0","2.29","0.0","1.3","0.0","188.4"

id2,"0.0","1.0","0.0","0.6","0.0","0.0"

对于这个 csv 文件，我想:

1. 进入第一行(id1)

2. 检查第 1 列 (r269_d)

   2.1 如果 col1 的值 = 0 将 0 写入新的 result_string

   2.2 如果 col1 的值 != 0 将 1 写入新的 result_string

3. 检查第 2 列 (r295_A)

   3.1 如果col2的值=0，将0写入2.1中提到的同一个result_string

   3.2 If value of col2 != 0 write 1 to the same result_string as mentioned in 2.1

4. 对所有列执行此操作

5. 转到下一行并执行相同的操作。

最后我想要这样的东西:

Column Header,"r269_d","r295_A","r295_R","r299_A","r325_D","r326_A", "result_string"

id1,"0.0","2.29","0.0","1.3","0.0","188.4","010101"

id2,"0.0","1.0","0.0","0.6","0.0","0.0","010100"

Answer 1

Pandas 解决方案:

import pandas as pd
import numpy as np

df = pd.read_csv(r'/path/to/file.csv')

df['result_string'] = (df.filter(regex='r\d+')
                         .ne(0).astype(np.int8).astype(str)
                         .apply(''.join, axis=1))

df.to_csv(r'/path/to/result.csv', index=False)

源 CSV 文件:

col,r269_d,r295_A,r295_R,r299_A,r325_D,r326_A
id1,0.0,2.29,0.0,1.3,0.0,188.4
id2,0.0,1.0,0.0,0.6,0.0,0.0

解析的 DF:

In [169]: df
Out[169]:
   col  r269_d  r295_A  r295_R  r299_A  r325_D  r326_A
0  id1     0.0    2.29     0.0     1.3     0.0   188.4
1  id2     0.0    1.00     0.0     0.6     0.0     0.0

结果:

In [170]: df['result_string'] = (df.filter(regex='r\d+')
     ...:                          .ne(0).astype(np.int8).astype(str)
     ...:                          .apply(''.join, axis=1))
     ...:

In [171]: df
Out[171]:
   col  r269_d  r295_A  r295_R  r299_A  r325_D  r326_A result_string
0  id1     0.0    2.29     0.0     1.3     0.0   188.4        010101
1  id2     0.0    1.00     0.0     0.6     0.0     0.0        010100

In [172]: df.to_csv(r'c:/temp/result.csv', index=False)

生成的 CSV:

col,r269_d,r295_A,r295_R,r299_A,r325_D,r326_A,result_string
id1,0.0,2.29,0.0,1.3,0.0,188.4,010101
id2,0.0,1.0,0.0,0.6,0.0,0.0,010100