Question

我有一个.txt文件，里面有三列。

id      ImplementationAuthority.email   AssignedEngineer.email
ALU02034116     bin.a.chen@shan.cn bin.a.chen@ell.com.cn
ALU02035113                                     Guolin.Pan@ell.com.cn
ALU02034116     bin.a.chen@ming.com.cn Guolin.Pan@ell.com.cn
ALU02022055     fria-sha-qdv@list.com
ALU02030797     fria-che-equipment-1@phoenix.com    Balagopal.Velusamy@phoenix.com

我需要创建两个列表，其中包含Implementation Authority.mail和Assigned Engineer.mail列下的值。当列具有compltete值（即没有空值）时，它可以正常工作。当列包含空值时，值会混合。

aengg=[]
iauth=[]

with open('test.txt') as f:
 for i, row in enumerate(f):
  columns = row.split()
  if len(columns) == 3:
   aengg.append(columns[2])
   iauth.append(columns[1])

 print aengg
 print iauth

我尝试使用此代码，它完全适用于完整的列值。谁能告诉我一个空值的解决方案？

Answer 1

好像你没有分隔符。我为你的情况使用了多个空格。并填写空白。

试试这个：

#!/usr/bin/env python
# -*- coding:utf-8 -*- 

aengg = []
iauth = []

with open('C:\\temp\\test.txt') as f:
    for i, row in enumerate(f):
        columns = row.split()
        if len(columns) == 2:
            # when there are more than 17 spaces between two elements, I consider it as a third element in the row, then I add a None between them
            if row.index(columns[1]) > 17:
                columns.insert(1, None)
            # if there are less than 17 spaces between two elements, I consider it as the second element in the row, then I add a None to the tail
            else:
                columns.append(None)
        print columns
        aengg.append(columns[2])
        iauth.append(columns[1])

print aengg
print iauth

这是输出。

['id', 'ImplementationAuthority.email', 'AssignedEngineer.email']
['ALU02034116', 'bin.a.chen@shan.cn', 'bin.a.chen@ell.com.cn']
['ALU02035113', None, 'Guolin.Pan@ell.com.cn']
['ALU02034116', 'bin.a.chen@ming.com.cn', 'Guolin.Pan@ell.com.cn']
['ALU02022055', 'fria-sha-qdv@list.com', None]
['ALU02030797', 'fria-che-equipment-1@phoenix.com', 'Balagopal.Velusamy@phoenix.com']
['AssignedEngineer.email', 'bin.a.chen@ell.com.cn', 'Guolin.Pan@ell.com.cn', 'Guolin.Pan@ell.com.cn', None, 'Balagopal.Velusamy@phoenix.com']
['ImplementationAuthority.email', 'bin.a.chen@shan.cn', None, 'bin.a.chen@ming.com.cn', 'fria-sha-qdv@list.com', 'fria-che-equipment-1@phoenix.com']

Answer 2

你需要放置一个＆＃39; null＆＃39;或0作为占位符。

口译员将第二栏中的Guolin.Pan@ell.com.cn读作第二栏。

试试这个

id      ImplementationAuthority.email   AssignedEngineer.email
ALU02034116     bin.a.chen@shan.cn bin.a.chen@ell.com.cn
ALU02035113     null                   Guolin.Pan@ell.com.cn
ALU02034116     bin.a.chen@ming.com.cn Guolin.Pan@ell.com.cn
ALU02022055     fria-sha-qdv@list.com  null
ALU02030797     fria-che-equipment-1@phoenix.com    Balagopal.Velusamy@phoenix.com

然后在检查非空后附加值。

with open('test.txt') as f:
 for i, row in enumerate(f):
  columns = row.split()
  if len(columns) == 3:
   if columns[2] != "null":
    aengg.append(columns[2])
   if columns[1] != "null":
    iauth.append(columns[1])

忽略python中的空值列

2 个答案: