查找列中的值与列表 Python 中的值不匹配的行

Question

我有一个带有 ID 和一些电子邮件地址的数据框

personid  sup1_email      sup2_email         sup3_email        sup4_email
1         evan.o@abc.com  jon.k@abc.com      kelm.q@abc.com    john.d@abc.com 
5         evan.o@abc.com  polly.u@abc.com    jim.e@ABC.COM     nan
11        jim.y@abc.com   manfred.a@abc.com  greg.s@Abc.com    adele.a@abc.com 
52        jim.y@abc.com   manfred.a@abc.com  greg.s@Abc.com    adele.a@abc.com
65        evan.o@abc.com  lenny.t@yahoo.com  john.s@abc.com    sally.j@ABC.com
89        dom.q@ABC.com   laurie.g@Abc.com   topher.u@abc.com  ross.k@qqpower.com

我想找到与接受的电子邮件值列表不匹配的行（即 NOT '@abc.com'、'@ABC.COM'、'@Abc.com'）。我想要的是这个

personid  sup1_email      sup2_email         sup3_email        sup4_email
65        evan.o@abc.com  lenny.t@yahoo.com  john.s@abc.com    sally.j@ABC.com
89        dom.q@ABC.com   laurie.g@Abc.com   topher.u@abc.com  ross.k@qqpower.com

我已经编写了以下代码并且它可以工作，但是我必须手动检查每个 sup_email 列并重复该过程，这是低效的

#list down all the variations of accepted email domains
email_adds = ['@abc.com','@ABC.COM','@Abc.com']
#combine the variations of email addresses in the list
accepted_emails = '|'.join(email_adds)


not_accepted = df.loc[~df['sup1_email'].str.contains(accepted_emails, na=False)]

我想知道是否有更有效的方法来使用 for 循环来做到这一点。到目前为止，我管理的是显示包含未接受电子邮件的列，但未显示包含未接受电子邮件的行。感谢我能得到的任何形式的帮助，谢谢。

sup_emails = df[['sup1_email','sup2_email', 'sup3_email', 'sup4_email']]

#for each sup column, check if the accepted email addresses are not in it
for col in sup_emails:
    if any(x not in col for x in accepted_emails):
        print(col)

Answer 1

你可以这样做：

# list down all the variations of accepted email domains
email_adds = ['@abc.com','@ABC.COM','@Abc.com']

# combine the variations of email addresses in the list
accepted_emails = '|'.join(email_adds)

# create a single email column
melted = df.melt('personid')

# check the matching emails
mask = melted['value'].str.contains(accepted_emails, na=True)

# filter out the ones that do not match
mask = df['personid'].isin(melted.loc[~mask, 'personid'])

print(df[mask])

输出

   personid      sup1_email  ...        sup3_email          sup4_email
4        65  evan.o@abc.com  ...    john.s@abc.com     sally.j@ABC.com
5        89   dom.q@ABC.com  ...  topher.u@abc.com  ross.k@qqpower.com

[2 rows x 5 columns]

Answer 2

一个想法：

#list down all the variations of accepted email domains
email_adds = ['@abc.com','@ABC.COM','@Abc.com']
#combine the variations of email addresses in the list
accepted_emails = '|'.join(email_adds)

#columns for test
c = ['sup1_email','sup2_email', 'sup3_email', 'sup4_email']
#reshape and test all values, if `nan` pass `True`
m = df[c].stack(dropna=False).str.contains(accepted_emails, na=True).unstack().all(axis=1)

df = df[~m]
print (df)
   personid      sup1_email         sup2_email        sup3_email  \
4        65  evan.o@abc.com  lenny.t@yahoo.com    john.s@abc.com   
5        89   dom.q@ABC.com   laurie.g@Abc.com  topher.u@abc.com   

           sup4_email  
4     sally.j@ABC.com  
5  ross.k@qqpower.com  

您的解决方案与生成器和any:

c = ['sup1_email','sup2_email', 'sup3_email', 'sup4_email']

f = lambda y: any(x in y for x in email_adds) if isinstance(y, str) else True
df = df[~df[c].applymap(f).all(axis=1)]
print (df)
   personid      sup1_email         sup2_email        sup3_email  \
4        65  evan.o@abc.com  lenny.t@yahoo.com    john.s@abc.com   
5        89   dom.q@ABC.com   laurie.g@Abc.com  topher.u@abc.com   

           sup4_email  
4     sally.j@ABC.com  
5  ross.k@qqpower.com  

Answer 3

让我们尝试检查所有列中@ 之后的字符是否为ABC 或abc 或Abc。当然我们可以暂时过滤掉PersonID。检查后，使用~反转结果并屏蔽它们

df[-(df.iloc[:,1:].apply(lambda x: x.str.contains('(\@(?=ABC|abc|Abc))').all(), axis=1))]



 personid      sup1_email         sup2_email        sup3_email  \
4      65.0  evan.o@abc.com  lenny.t@yahoo.com    john.s@abc.com   
5      89.0   dom.q@ABC.com   laurie.g@Abc.com  topher.u@abc.com   

           sup4_email  
4     sally.j@ABC.com  
5  ross.k@qqpower.com