复制函数的返回值

Question

我在弄清楚如何将z == 2时返回的值复制到循环函数中的z == 3 elseif时遇到问题。我认为它与以下事实有关：当我在z == 3中打印行时，我再次调用行函数导致生成随机id。

import datetime
import random
import string

def date():
    date1 = datetime.date.today()
    return date1.strftime('%Y%m%d')

def loops():
    # User defined input


    # new file create
    import os
    os.path.abspath('fdc/')
    filename = str(prefix1 + date() + '.txt')

    # row loop
    z = int(0)
    with open(filename, 'w') as f:
        # howmany variable no longer exists because there will be 15 lines - 1 for each scenario
        while z < 3:
            if z == 1:
                row()
            elif z == 2:
                row2 = str(row())
                row3 = row2
            elif z == 3:
                print row3
            else:
                row()
            f.write(str(row()))
            z += 1
        f.write(str(trailer()))
        f.close()


def rand_char(y):
        return ''.join(random.choice(string.ascii_lowercase) for x in range(y))


def trailer():
    trailer1 = str("X").ljust(20, "X") + str("0").ljust(8, "0") + date().ljust(8, " ") + str(" ").ljust(413, " ") + \
               str('\n').ljust(1, " ")[:1]
    # print trailer1
    return trailer1


# End of line 1 - ASCII 0A {LF}
eoline = str('\n').ljust(1, " ")[:1]


def row():
    # FDI Internal Merchant ID Generation
    fdimerch_id = ((prefix1 + date() + str(random.randint(0, 50000)) + str(rand_char(10))).rjust(20, " "))[:20]
    row1 = fdimerch_id + eoline
    return  row1

prefix1 = str(raw_input("Enter a prefix:"))
email = str(raw_input("Enter an email: "))

loops()