cp -r from_dir/* to_dir 与 python

Question

有没有一种简单的方法可以用 python 模拟命令cp -r from_dir/* to_dir？ shutil.copytree 不适合，因为 to_dir 存在。

Answer 1

看一下shutil.copytree的源码，改编使用：

def copytree(src, dst, symlinks=False, ignore=None):
    """Recursively copy a directory tree using copy2().

    The destination directory must not already exist.
    If exception(s) occur, an Error is raised with a list of reasons.

    If the optional symlinks flag is true, symbolic links in the
    source tree result in symbolic links in the destination tree; if
    it is false, the contents of the files pointed to by symbolic
    links are copied.

    The optional ignore argument is a callable. If given, it
    is called with the `src` parameter, which is the directory
    being visited by copytree(), and `names` which is the list of
    `src` contents, as returned by os.listdir():

        callable(src, names) -> ignored_names

    Since copytree() is called recursively, the callable will be
    called once for each directory that is copied. It returns a
    list of names relative to the `src` directory that should
    not be copied.

    XXX Consider this example code rather than the ultimate tool.

    """
    names = os.listdir(src)
    if ignore is not None:
        ignored_names = ignore(src, names)
    else:
        ignored_names = set()

    os.makedirs(dst)
    errors = []
    for name in names:
        if name in ignored_names:
            continue
        srcname = os.path.join(src, name)
        dstname = os.path.join(dst, name)
        try:
            if symlinks and os.path.islink(srcname):
                linkto = os.readlink(srcname)
                os.symlink(linkto, dstname)
            elif os.path.isdir(srcname):
                copytree(srcname, dstname, symlinks, ignore)
            else:
                copy2(srcname, dstname)
            # XXX What about devices, sockets etc.?
        except (IOError, os.error), why:
            errors.append((srcname, dstname, str(why)))
        # catch the Error from the recursive copytree so that we can
        # continue with other files
        except Error, err:
            errors.extend(err.args[0])
    try:
        copystat(src, dst)
    except OSError, why:
        if WindowsError is not None and isinstance(why, WindowsError):
            # Copying file access times may fail on Windows
            pass
        else:
            errors.extend((src, dst, str(why)))
    if errors:
        raise Error, errors

Answer 2

您只需使用正确的名称（或相同的名称）copytree

shutil.copytree("/path/from_dir","/destination/from_dir")

Answer 3

import glob
import subprocess

subprocess.check_call(["cp", "-rt", "to_dir"] + glob.glob("from_dir/*"))

有时自己直接在 Python 中完成所有事情会很好；再说一次，调用你知道如何控制和知道如何工作的命令通常会更好。

当需求发生变化时，我会毫不犹豫地重写此 if，但在此之前，它简短易读——更多的时间最好花在更大的问题上。他们可能如何改变的一个很好的例子是报告一个错误：你没有说什么，但一旦需要，我不会解析 cp 的输出。