两个csv文件之间的问题计算差异

Question

我试图获得两个csv文件A.csv和B.csv之间的差异，以便获得在第二个文件中添加的新行。csv包含以下数据

acct    ABC     88888888    99999999    ABC-GHD 4/1/18  4   1   2018    Redundant/RSK

B.csv包含以下数据

acct    ABC     88888888    99999999    ABC-GHD 4/1/18  4   1   2018    Redundant/RSK
acct    ABC     88888888    99999999    ABC-GHD 4/1/18  4   1   2018    DT/89

要将添加到输出文件中的新行写入，我将使用以下脚本

input_file1 = "A.csv"
input_file2 = "B.csv"
output_path = "out.csv"

with open(input_file1, 'r') as t1:
    fileone = set(t1)
with open(input_file2, 'r') as t2, open(output_path, 'w') as outFile:
    for line in t2:
        if line not in fileone:
            outFile.write(line)

预期输出为：

acct    ABC     88888888    99999999    ABC-GHD 4/1/18  4   1   2018    DT/89 

通过上述脚本获得的输出是：

acct    ABC     88888888    99999999    ABC-GHD 4/1/18  4   1   2018    Redundant/RSK
acct    ABC     88888888    99999999    ABC-GHD 4/1/18  4   1   2018    DT/89

我不知道我在哪里犯了错误，尝试调试它，但没有任何进展

Answer 1

你需要小心后面的换行符。因此，在比较之前删除换行符，然后在写入时将其添加回更安全的方法是：

input_file1 = "A.csv"
input_file2 = "B.csv"
output_path = "out.csv"

with open(input_file1, 'r') as t1:
    fileone = set(t1.read().splitlines())

with open(input_file2, 'r') as t2, open(output_path, 'w') as outFile:
    for line in t2:
        line = line.strip()

        if line not in fileone:
            outFile.write(line + '\n')