将制表符/fi分隔的字节转换为Python/fi分隔的字节

Question

我正在从一个API中提取以下数据行。数据以b前缀开头，根据Python 3.3 documentation表示我们正在处理的是转义序列\t和{}，分别表示ASCII水平制表符（Tab）和ASCII换行符（LF）。在

b'settlement-id\tsettlement-start-date\tsettlement-end-date\tdeposit-date\ttotal-amount\tcurrency\ttransaction-type\torder-id\tmerchant-order-id\tadjustment-id\tshipment-id\tmarketplace-name\tamount-type\tamount-description\tamount\tfulfillment-id\tposted-date\tposted-date-time\torder-item-code\tmerchant-order-item-id\tmerchant-adjustment-item-id\tsku\tquantity-purchased\n7293436482\t03.05.2018 09:10:07 UTC\t04.05.2018 20:30:23 UTC\t06.05.2018 20:30:23 UTC\t53,44\tEUR\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\n7293436482\t\t\t\t\t\tOrder\t303-3746292-6119509\t\t\tDRGC8lFbB\tAmazon.de\tItemPrice\tPrincipal\t179,99\tMFN\t03.05.2018\t03.05.2018 17:12:22 UTC\t30407746733299\t\t\t3700546702556-180412-chp-18c10347-1\t1\n7293436482\t\t\t\t\t\tOrder\t303-3746292-6119509\t\t\tDRGC8lFbB\tAmazon.de\tItemFees\tCommission\t-32,40\tMFN\t03.05.2018\t03.05.2018 17:12:22 UTC\t30407746733299\t\t\t3700546702556-180412-chp-18c10347-1\t1\n7293436482\t\t\t\t\t\tRefund\t305-1251749-5602732\t305-1251749-5602732\tamzn1:crow:YZkTuxs4RhO8FpZez3cGCg\t\tAmazon.de\tItemPrice\tPrincipal\t-109,99\tAFN\t04.05.2018\t04.05.2018 18:24:39 UTC\t38048998219979\t\t142721169810\t3700546702082-180124-jpn-131N28-6\t\n7293436482\t\t\t\t\t\tRefund\t305-1251749-5602732\t305-1251749-5602732\tamzn1:crow:YZkTuxs4RhO8FpZez3cGCg\t\tAmazon.de\tItemFees\tCommission\t19,80\tAFN\t04.05.2018\t04.05.2018 18:24:39 UTC\t38048998219979\t\t142721169810\t3700546702082-180124-jpn-131N28-6\t\n7293436482\t\t\t\t\t\tRefund\t305-1251749-5602732\t305-1251749-5602732\tamzn1:crow:YZkTuxs4RhO8FpZez3cGCg\t\tAmazon.de\tItemFees\tRefundCommission\t-3,96\tAFN\t04.05.2018\t04.05.2018 18:24:39 UTC\t38048998219979\t\t142721169810\t3700546702082-180124-jpn-131N28-6\t\n'

当我使用.decode("utf-8")将此数据转换为字符串时，我得到了相应的制表符分隔的数据：

^{pr2}$

但是，我似乎无法将此数据保存到制表符分隔的csv文件中。我尝试了几种方法将此数据保存到csv文件中，但都失败了，包括：

with open("folder_GET_V2_SETTLEMENT_REPORT_DATA_FLAT_FILE_V2_/" + grl_id + ".csv", "w") as csv_file:
    writer = csv.writer(csv_file)
    for row in csv_file:
        print(row)

这给了我以下错误：

    for row in csv_file:
io.UnsupportedOperation: not readable

更新： 所以问题出在别处。实际上，在我的各种测试中，我已经成功地生成了与您相同的文件，因为输出看起来有问题。在excel中打开文件时，数据被分成两列。在

我现在已经弄明白了，这是因为有些数字是用欧洲的方法记小数的，那就是昏迷179,99。因此，Excel将其解释为一个分隔符，而如果我在记事本中打开该文件，它将正确读取。在

Answer 1

你得到了错误，因为你想把数据写入csv文件，但是在for循环中你试图从文件中读取。如果我理解正确的话，您希望接受bytes对象，并将其很好地写入一个选项卡分隔的csv文件中。以下代码可以做到这一点：

import csv, re

orig = b'settlement-id\tsettlement-start-date\tsettlement-end-date\tdeposit-date\ttotal-amount\tcurrency\ttransaction-type\torder-id\tmerchant-order-id\tadjustment-id\tshipment-id\tmarketplace-name\tamount-type\tamount-description\tamount\tfulfillment-id\tposted-date\tposted-date-time\torder-item-code\tmerchant-order-item-id\tmerchant-adjustment-item-id\tsku\tquantity-purchased\n7293436482\t03.05.2018 09:10:07 UTC\t04.05.2018 20:30:23 UTC\t06.05.2018 20:30:23 UTC\t53,44\tEUR\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\n7293436482\t\t\t\t\t\tOrder\t303-3746292-6119509\t\t\tDRGC8lFbB\tAmazon.de\tItemPrice\tPrincipal\t179,99\tMFN\t03.05.2018\t03.05.2018 17:12:22 UTC\t30407746733299\t\t\t3700546702556-180412-chp-18c10347-1\t1\n7293436482\t\t\t\t\t\tOrder\t303-3746292-6119509\t\t\tDRGC8lFbB\tAmazon.de\tItemFees\tCommission\t-32,40\tMFN\t03.05.2018\t03.05.2018 17:12:22 UTC\t30407746733299\t\t\t3700546702556-180412-chp-18c10347-1\t1\n7293436482\t\t\t\t\t\tRefund\t305-1251749-5602732\t305-1251749-5602732\tamzn1:crow:YZkTuxs4RhO8FpZez3cGCg\t\tAmazon.de\tItemPrice\tPrincipal\t-109,99\tAFN\t04.05.2018\t04.05.2018 18:24:39 UTC\t38048998219979\t\t142721169810\t3700546702082-180124-jpn-131N28-6\t\n7293436482\t\t\t\t\t\tRefund\t305-1251749-5602732\t305-1251749-5602732\tamzn1:crow:YZkTuxs4RhO8FpZez3cGCg\t\tAmazon.de\tItemFees\tCommission\t19,80\tAFN\t04.05.2018\t04.05.2018 18:24:39 UTC\t38048998219979\t\t142721169810\t3700546702082-180124-jpn-131N28-6\t\n7293436482\t\t\t\t\t\tRefund\t305-1251749-5602732\t305-1251749-5602732\tamzn1:crow:YZkTuxs4RhO8FpZez3cGCg\t\tAmazon.de\tItemFees\tRefundCommission\t-3,96\tAFN\t04.05.2018\t04.05.2018 18:24:39 UTC\t38048998219979\t\t142721169810\t3700546702082-180124-jpn-131N28-6\t\n'

# Split the long string into a list of lines
data = orig.decode('utf-8').splitlines()

# Open the file for writing
with open("tmp.csv", "w") as csv_file:
    # Create the writer object with tab delimiter
    writer = csv.writer(csv_file, delimiter = '\t')
    for line in data:
        # Writerow() needs a list of data to be written, so split at all empty spaces in the line 
        writer.writerow(re.split('\s+',line))