Question

我正在尝试创建python脚本来存档和压缩datewise tar文件中的一年旧数据。脚本还生成已归档文件的日志文件。我在linux上使用python 2.6。

这是我的代码：

for search_date in dd_list:
    tar_file = "/files/yearly_archive/nas_archive_" + search_date + ".tgz"
    mytar = tarfile.open(tar_file,"w:gz")
    log_file = "/files/yearly_archive/archive_log_" + search_date
    fcount = 0
    #print tar_file
    #print log_file
    f = open(log_file,'ab+')
    for f_name, d_date in date_file_dict.iteritems():
        if d_date == search_date:
            #print f_name
            fcount += 1
            mytar.add(f_name)
            f.write(f_name + '\n')
    date_occur_dict[search_date] = fcount
    mytar.close()
    f.close()

如果存在日志文件，则会附加日志文件，但每次运行脚本时都会覆盖tar文件。有没有办法我可以确保tar文件被附加，如果它存在，否则会被创建？

编辑：

我尝试添加用于解压缩和添加的代码，但它无法正常工作。

for search_date in dd_list:
    tar_file = "/files/yearly_archive/nas_archive_" + search_date + ".tgz"
    zip = 1
    try:
        with open(tar_file,'ab+'):
            import gzip
            d_tar = gzip.open(tar_file,'wb')
            zip = 0
    except IOError:
        print "Creating new tar file"
    if zip == 1:
        mytar = tarfile.open(tar_file,"w:gz")
    else:
        mytar = tarfile.open(d_tar,"w")
    log_file = "/files/yearly_archive/archive_log_" + search_date
    fcount = 0
    #print tar_file
    #print log_file
    f = open(log_file,'ab+')
    for f_name, d_date in date_file_dict.iteritems():
        if d_date == search_date:
            #print f_name
            fcount += 1
            mytar.add(f_name)
            f.write(f_name + '\n')
    date_occur_dict[search_date] = fcount
    mytar.close()
    f.close()

我收到以下错误：

Traceback (most recent call last):
  File "sort_archive.py", line 63, in <module>
    mytar = tarfile.open(d_tar,"w")
  File "/usr/lib64/python2.6/tarfile.py", line 1687, in open
    return cls.taropen(name, mode, fileobj, **kwargs)
  File "/usr/lib64/python2.6/tarfile.py", line 1697, in taropen
    return cls(name, mode, fileobj, **kwargs)
  File "/usr/lib64/python2.6/tarfile.py", line 1518, in __init__
    fileobj = bltn_open(name, self._mode)
TypeError: coercing to Unicode: need string or buffer, instance found

Answer 1

您无法使用tarfile附加到压缩的tarball。单独执行解压缩/压缩步骤，或者首先不使用压缩。

Answer 2

＆LT;删除线＆gt;

您是否尝试更改模式？我看到w，它明显覆盖了文件。尝试使用a或w +。

mytar = tarfile.open(tar_file,"w+:gz")

或

mytar = tarfile.open(tar_file,"a:gz")

＆LT; / strikethrough＆gt;

tarfile.open每次都会覆盖该文件

2 个答案: