python - python: update (source newer than destination or destination missing) copy files

Question

Is there a ready tool in python to update copy files? "Update copy" means that a copy should only be made if the source file is newer than the destination or if the destination file is missing, i.e. equivalent of the Linux cp -u command.

I understand that I could write the code myself by checking for existence of each destination file and by checking the time-stamps of both the source and the destination files and comparing them, but I do not want to "invent the bicycle" (i.e. invent something that has already been invented a long time ago) here if such a tool already exists.

Thank you very much for your help!

标签： pythonfilecopyupdates

Answer 1

该distutils模块可以做到这一点。

例如，要更新 directoryb中已更改的所有文件 directory a：

from distutils.dir_util import copy_tree
copy_tree("a", "b", update=1)

不是很有帮助，这将返回其中所有文件的列表，这些文件b是否a已更新（也就是说，如果文件x在两个目录中，即使它不需要更新，它也会在列表中）。

您还可以使用：

from distutils.file_util import copy_file
copy_file('src', 'dst', update=1)

这至少会返回一个有用的元组：

('dst', 1)

1指示文件已更新，否则0。（即该值是真实的，但不一定是 a bool）。