Python - 一次写入 header - 循环无法正常工作

Question

我正在尝试编写一个带有标题行和详细信息行的“订单文件”。我成功地将订单 header 写入文件，但似乎只有一个详细信息行被写入文件。

for k, v in atlantic_billing.iteritems():
    XHORNO = str(digits + counter)
    XHCSNO = k
    print XHCSNO
    machines = v
    line = 1
    counter = counter + 1
    header_written = False
    try :
        for machine in machines :
            XDORNO = XHORNO
            XDORSQ = line
            line = line + 1
            XDITD1 = ranpak_dict[machine]['MODEL']
            XDITD2 = ranpak_dict[machine]['SN']
            XDCAVC = ranpak_dict[machine]['TOTAL']
            print XDORSQ, XDITD1, XDITD2, XDCAVC
            if XDCAVC > 0 :
                if header_written == False :
                    with open(XHORNO + ".txt", 'w') as order:
                        order.write("H01, " + XHORNO + ", " + XHCSNO + "\n")
                        order.write("D01," + str(XDORSQ) + ", " + ' EQPRANUSER, ' + XDITD1 + ", " +  XDITD2 + ", " + XDCAVC + "\n")
                else :
                    order.write("D01," + str(XDORSQ) + ", " + ' EQPRANUSER, ' + XDITD1 + ", " +  XDITD2 + ", " + XDCAVC + "\n")
                    success.append(machine)
                    header_written = True

    except KeyError, e:
        issues.append(machine)

Answer 1

打开文件时，应使用模式“A”，否则文件将在每次循环时被覆盖(一次又一次):

 with open(XHORNO + ".txt", 'a') as order:
     ...

参见https://docs.python.org/3/library/functions.html#open

另一种选择是使用 with block 而不是 for block 。