Python中的For循环没有正确地将列表划分为子集
Python中的For循环没有正确地将列表划分为子集
提问于 2019-06-27 01:37:28
Python新手如此赤裸裸。
我正在尝试找到一种方法来确定一个包含字符串和变量的列表是否是另一个列表的子集。到目前为止，请查看下面的代码和结果
y = ['test_sam_20190624.csv', 'test_phil_20190624.csv', 'test_bill_20190624.csv', 'test_jess_20190624.csv', 'test_issy_20190624.csv', 'test_clinton_20190624.csv']
x = ['sam', 'jack', 'bill', 'rodry', 'clinton']
print('\nFile list is ')
print(*y, sep="\n")
print('\nNeeded names are ')
print(*x, sep="\n")
datetoday = '20190624'
incl = [p for p in x if 'test'+p+datetoday+'.csv' in y]
not_incl = [p for p in x if 'test'+p+datetoday+'.csv' not in y]
print("\n Included")
print(*incl, sep="\m")
print("\n Not included")
print(*not_incl, sep="\n")和下面给出的输出：
File list is
test_sam_20190624.csv
test_phil_20190624.csv
test_bill_20190624.csv
test_jess_20190624.csv
test_issy_20190624.csv
test_clinton__20190624.csv
Needed names are
sam
jack
bill
rodry
clinton
Included
Not included
sam
jack
bill
rodry
clinton
Process finished with exit code 0但我肯定会期望incl = ['sam' 'bill 'clinton']作为输出？输出为：
Included
sam
bill
clinton
Not included
jack
rodry我哪里错了？也许在字符串的连接中？
回答 4
Stack Overflow用户
回答已采纳
发布于 2019-06-27 01:45:17
您没有在搜索中包含完整的字符串：
incl = [p for p in x if 'test'+'_'+p+'_'+datetoday+'.csv' in y]
not_incl = [p for p in x if 'test'+'_'+p+'_'+datetoday+'.csv' not in y]您在查找中忘记了下划线。
[dkennetz@nodecn203 fun]$ python3.5 fun.py
File list is
test_sam_20190624.csv
test_phil_20190624.csv
test_bill_20190624.csv
test_jess_20190624.csv
test_issy_20190624.csv
test_clinton_20190624.csv
Needed names are
sam
jack
bill
rodry
clinton
Included
sam\mbill\mclinton
Not included
jack
rodryStack Overflow用户
发布于 2019-06-27 01:47:29
您似乎忘记了串联中的_%s。
试着改变：
incl = [p for p in x if 'test'+p+datetoday+'.csv' in y]至
incl = [p for p in x if 'test_'+p+'_'+datetoday+'.csv']Not_incl也是如此：
not_incl = [p for p in x if 'test'+p+datetoday+'.csv' not in y]应该是
not_incl = [p for p in x if 'test_'+p+'_'+datetoday+'.csv' not in y]现在你应该得到想要的输出了。
Stack Overflow用户
发布于 2019-06-27 01:56:01
if语句中缺少下划线(_)。它应该如下所示。
incl = [p for p in x if 'test_'+p+'_'+datetoday+'.csv' in y]
not_incl = [p for p in x if 'test_'+p+'_'+datetoday+'.csv' not in y]页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/56778342
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