Gunzip Python 中源目录中的所有文件

Question

我已经编写了一个代码来压缩源文件夹中存在的所有文件。但我想包括检查，如果 gunzipped 文件不存在，那么 gunzip 它否则移动到下一个文件。

source_dir = "/Users/path"
dest_dir = "/Users/path/Documents/path"


for src_name in glob.glob(os.path.join(source_dir, '*.gz')):

    base = os.path.basename(src_name)
    dest_name = os.path.join(dest_dir, base[:-3])
    with: gzip.open(src_name, 'rb') as infile, open(dest_name, 'wb') as outfile:
            try:
                for line in infile:
                    print ("outfile: %s" %outfile)
                    if not os.path.exists(dest_name):
                      outfile.write(line)
                      print( "converted: %s" %dest_name) 

            except EOFError:
                print("End of file error occurred.")

            except Exception:
                print("Some error occurred.")

我已经用os.path.exist检查文件是否存在，但好像os.path.exist在这里不起作用。

Answer 1

我认为您放错了 path.exists 调用。应该是：

source_dir = "/Users/path"
dest_dir = "/Users/path/Documents/path"


for src_name in glob.glob(os.path.join(source_dir, '*.gz')):

    base = os.path.basename(src_name)
    dest_name = os.path.join(dest_dir, base[:-3])

    if not os.path.exists(dest_name):
        with gzip.open(src_name, 'rb') as infile, open(dest_name, 'wb') as outfile:
            try:
                for line in infile:
                    print("outfile: %s" % outfile)
                    outfile.write(line)
                    print("converted: %s" % dest_name)

            except EOFError:
                print("End of file error occurred.")

            except Exception:
                print("Some error occurred.")

也正如@MadPhysicist 所强调的： "doing the check after open(..., 'wb') (as you did in your original code), will always say that the file exists because that is what open(..., 'w') does"

最重要的是，即使您对 gunzipping 的必要性进行了一些其他检查，在您放置它的地方执行它也会对每一行进行检查，这是完全多余的，因为结果与所有行 (exists/not-exists).

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