Python文件复制shutil模块
Python中shutil模块主要用于文件操作，如复制，属性判断等
1.copyfileobj，拷贝文件内容，将文件句柄赋给该方法
def copyfileobj(src, dst, length=16*1024): """copy data from file-like object src to file-like object dst""" while 1: buf = src.read(length) if not buf: break dst.write(buf)
''' 复制文件内容到另一个文件，需先打开两个文件 语法：shutil.copyfileobj(fsrc, fdst, length=1024) ''' with open("src.txt", encoding='utf-8') as fsrc: with open("dst.txt", 'w', encoding='utf-8') as fdst: shutil.copyfileobj(fsrc, fdst)
2.copyfile，拷贝文件，将文件路径赋给该方法即可
def copyfile(src, dst, *, follow_symlinks=True): """Copy data from src to dst. If follow_symlinks is not set and src is a symbolic link, a new symlink will be created instead of copying the file it points to. """ if _samefile(src, dst): raise SameFileError("{!r} and {!r} are the same file".format(src, dst)) for fn in [src, dst]: try: st = os.stat(fn) except OSError: # File most likely does not exist pass else: # XXX What about other special files? (sockets, devices...) if stat.S_ISFIFO(st.st_mode): raise SpecialFileError("`%s` is a named pipe" % fn) if not follow_symlinks and os.path.islink(src): os.symlink(os.readlink(src), dst) else: with open(src, 'rb') as src: with open(dst, 'wb') as dst: copyfileobj(src, dst) return dst
# 拷贝文件，无需先打开两个文件, # 语法：shutil.copyfile(src, dst) path_src = 'src' path_dst = 'dst2' shutil.copyfile(path_src, path_dst)
3.copymode，仅拷贝文件权限（dst目标文件必须已经存在），将文件路径赋给该方法
def copymode(src, dst, *, follow_symlinks=True): """Copy mode bits from src to dst. If follow_symlinks is not set, symlinks aren't followed if and only if both `src` and `dst` are symlinks. If `lchmod` isn't available (e.g. Linux) this method does nothing. """ if not follow_symlinks and os.path.islink(src) and os.path.islink(dst): if hasattr(os, 'lchmod'): stat_func, chmod_func = os.lstat, os.lchmod else: return elif hasattr(os, 'chmod'): stat_func, chmod_func = os.stat, os.chmod else: return st = stat_func(src) chmod_func(dst, stat.S_IMODE(st.st_mode))
# 仅拷贝文件权限mode， # 语法：shutil.copymode(src,dst, *, follow_symlinks=True) shutil.copymode('src', 'dst2')
4.copystat，仅拷贝文件的属性信息stat（dst目标文件必须已经存在），将文件路径赋给该方法
def copystat(src, dst, *, follow_symlinks=True): """Copy all stat info (mode bits, atime, mtime, flags) from src to dst. If the optional flag `follow_symlinks` is not set, symlinks aren't followed if and only if both `src` and `dst` are symlinks. """ def _nop(*args, ns=None, follow_symlinks=None): pass # follow symlinks (aka don't not follow symlinks) follow = follow_symlinks or not (os.path.islink(src) and os.path.islink(dst)) if follow: # use the real function if it exists def lookup(name): return getattr(os, name, _nop) else: # use the real function only if it exists # *and* it supports follow_symlinks def lookup(name): fn = getattr(os, name, _nop) if fn in os.supports_follow_symlinks: return fn return _nop st = lookup("stat")(src, follow_symlinks=follow) mode = stat.S_IMODE(st.st_mode) lookup("utime")(dst, ns=(st.st_atime_ns, st.st_mtime_ns), follow_symlinks=follow) try: lookup("chmod")(dst, mode, follow_symlinks=follow) except NotImplementedError: # if we got a NotImplementedError, it's because # * follow_symlinks=False, # * lchown() is unavailable, and # * either # * fchownat() is unavailable or # * fchownat() doesn't implement AT_SYMLINK_NOFOLLOW. # (it returned ENOSUP.) # therefore we're out of options--we simply cannot chown the # symlink. give up, suppress the error. # (which is what shutil always did in this circumstance.) pass if hasattr(st, 'st_flags'): try: lookup("chflags")(dst, st.st_flags, follow_symlinks=follow) except OSError as why: for err in 'EOPNOTSUPP', 'ENOTSUP': if hasattr(errno, err) and why.errno == getattr(errno, err): break else: raise _copyxattr(src, dst, follow_symlinks=follow)
# 拷贝文件的属性信息stat，包括mode # 语法：shutil.copystat(src, dst, *, follow_symlinks=True) shutil.copystat('src', 'dst2')
5.copy，拷贝文件和文件权限mode，将文件路径赋给该方法
def copy(src, dst, *, follow_symlinks=True): """Copy data and mode bits ("cp src dst"). Return the file's destination. The destination may be a directory. If follow_symlinks is false, symlinks won't be followed. This resembles GNU's "cp -P src dst". If source and destination are the same file, a SameFileError will be raised. """ if os.path.isdir(dst): dst = os.path.join(dst, os.path.basename(src)) copyfile(src, dst, follow_symlinks=follow_symlinks) copymode(src, dst, follow_symlinks=follow_symlinks) return dst
# 拷贝文件和文件权限mode， # 语法：shutil.copy(src, dst, *, follow_symlinks=True) shutil.copy('src', 'dst3') # 测试 import os print(os.stat('src')) print(os.stat('dst3'))
6.copy2，拷贝文件和文件属性信息stat，将文件路径赋给该方法
def copy2(src, dst, *, follow_symlinks=True): """Copy data and all stat info ("cp -p src dst"). Return the file's destination." The destination may be a directory. If follow_symlinks is false, symlinks won't be followed. This resembles GNU's "cp -P src dst". """ if os.path.isdir(dst): dst = os.path.join(dst, os.path.basename(src)) copyfile(src, dst, follow_symlinks=follow_symlinks) copystat(src, dst, follow_symlinks=follow_symlinks) return dst
# 拷贝文件和文件属性stat，包括mode # 语法：shutil.copy2(src, dst, *, follow_symlinks=True) shutil.copy2('src', 'dst5') # 测试 import os print(os.stat('src')) print(os.stat('dst5'))
7.ignore_patterns，拷贝目录过程中，忽略/排除某些文件（以元组的形式）
def ignore_patterns(*patterns): """Function that can be used as copytree() ignore parameter. Patterns is a sequence of glob-style patterns that are used to exclude files""" def _ignore_patterns(path, names): ignored_names = [] for pattern in patterns: ignored_names.extend(fnmatch.filter(names, pattern)) return set(ignored_names) return _ignore_patterns def copytree(src, dst, symlinks=False, ignore=None, copy_function=copy2, ignore_dangling_symlinks=False): """Recursively copy a directory tree. 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. If the file pointed by the symlink doesn't exist, an exception will be added in the list of errors raised in an Error exception at the end of the copy process. You can set the optional ignore_dangling_symlinks flag to true if you want to silence this exception. Notice that this has no effect on platforms that don't support os.symlink. 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. The optional copy_function argument is a callable that will be used to copy each file. It will be called with the source path and the destination path as arguments. By default, copy2() is used, but any function that supports the same signature (like copy()) can be used. """ 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 os.path.islink(srcname): linkto = os.readlink(srcname) if symlinks: # We can't just leave it to `copy_function` because legacy # code with a custom `copy_function` may rely on copytree # doing the right thing. os.symlink(linkto, dstname) copystat(srcname, dstname, follow_symlinks=not symlinks) else: # ignore dangling symlink if the flag is on if not os.path.exists(linkto) and ignore_dangling_symlinks: continue # otherwise let the copy occurs. copy2 will raise an error if os.path.isdir(srcname): copytree(srcname, dstname, symlinks, ignore, copy_function) else: copy_function(srcname, dstname) elif os.path.isdir(srcname): copytree(srcname, dstname, symlinks, ignore, copy_function) else: # Will raise a SpecialFileError for unsupported file types copy_function(srcname, dstname) # catch the Error from the recursive copytree so that we can # continue with other files except Error as err: errors.extend(err.args[0]) except OSError as why: errors.append((srcname, dstname, str(why))) try: copystat(src, dst) except OSError as why: # Copying file access times may fail on Windows if getattr(why, 'winerror', None) is None: errors.append((src, dst, str(why))) if errors: raise Error(errors) return dst
# shutil.ignore_patterns忽略/排除文件， # 与shutil.copytree复制目录/递归复制连用， # 语法：shutil.ignore_patterns(*patterns)， # shutil.copytree(src, dst, symlinks=False, ignore=None, copy_function=copy2, ignore_dangling_symlinks=False) shutil.copytree(r'd:/a/', r'd:/b/', ignore=shutil.ignore_patterns('123.txt'))
8._rmtree_unsafe，递归删除目录
def _rmtree_unsafe(path, onerror): try: if os.path.islink(path): # symlinks to directories are forbidden, see bug #1669 raise OSError("Cannot call rmtree on a symbolic link") except OSError: onerror(os.path.islink, path, sys.exc_info()) # can't continue even if onerror hook returns return names = [] try: names = os.listdir(path) except OSError: onerror(os.listdir, path, sys.exc_info()) for name in names: fullname = os.path.join(path, name) try: mode = os.lstat(fullname).st_mode except OSError: mode = 0 if stat.S_ISDIR(mode): _rmtree_unsafe(fullname, onerror) else: try: os.unlink(fullname) except OSError: onerror(os.unlink, fullname, sys.exc_info()) try: os.rmdir(path) except OSError: onerror(os.rmdir, path, sys.exc_info()) def _rmtree_safe_fd(topfd, path, onerror): names = [] try: names = os.listdir(topfd) except OSError as err: err.filename = path onerror(os.listdir, path, sys.exc_info()) for name in names: fullname = os.path.join(path, name) try: orig_st = os.stat(name, dir_fd=topfd, follow_symlinks=False) mode = orig_st.st_mode except OSError: mode = 0 if stat.S_ISDIR(mode): try: dirfd = os.open(name, os.O_RDONLY, dir_fd=topfd) except OSError: onerror(os.open, fullname, sys.exc_info()) else: try: if os.path.samestat(orig_st, os.fstat(dirfd)): _rmtree_safe_fd(dirfd, fullname, onerror) try: os.rmdir(name, dir_fd=topfd) except OSError: onerror(os.rmdir, fullname, sys.exc_info()) else: try: # This can only happen if someone replaces # a directory with a symlink after the call to # stat.S_ISDIR above. raise OSError("Cannot call rmtree on a symbolic " "link") except OSError: onerror(os.path.islink, fullname, sys.exc_info()) finally: os.close(dirfd) else: try: os.unlink(name, dir_fd=topfd) except OSError: onerror(os.unlink, fullname, sys.exc_info())
# 递归删除目录及目录下文件，无论空目录还是非空目录 # 语法：shutil._rmtree_unsafe(path, onerror) shutil._rmtree_unsafe(r'd:/dudu', 'onerror')
9.move，递归移动目录或移动文件
def move(src, dst, copy_function=copy2): """Recursively move a file or directory to another location. This is similar to the Unix "mv" command. Return the file or directory's destination. If the destination is a directory or a symlink to a directory, the source is moved inside the directory. The destination path must not already exist. If the destination already exists but is not a directory, it may be overwritten depending on os.rename() semantics. If the destination is on our current filesystem, then rename() is used. Otherwise, src is copied to the destination and then removed. Symlinks are recreated under the new name if os.rename() fails because of cross filesystem renames. The optional `copy_function` argument is a callable that will be used to copy the source or it will be delegated to `copytree`. By default, copy2() is used, but any function that supports the same signature (like copy()) can be used. A lot more could be done here... A look at a mv.c shows a lot of the issues this implementation glosses over. """ real_dst = dst if os.path.isdir(dst): if _samefile(src, dst): # We might be on a case insensitive filesystem, # perform the rename anyway. os.rename(src, dst) return real_dst = os.path.join(dst, _basename(src)) if os.path.exists(real_dst): raise Error("Destination path '%s' already exists" % real_dst) try: os.rename(src, real_dst) except OSError: if os.path.islink(src): linkto = os.readlink(src) os.symlink(linkto, real_dst) os.unlink(src) elif os.path.isdir(src): if _destinsrc(src, dst): raise Error("Cannot move a directory '%s' into itself" " '%s'." % (src, dst)) copytree(src, real_dst, copy_function=copy_function, symlinks=True) rmtree(src) else: copy_function(src, real_dst) os.unlink(src) return real_dst
# 递归移动目录和文件 # 语法：shutil.move(src, dst, copy_function=copy2) shutil.move(r'd:/a', r'd:/b')
10.make_archive，打包压缩文件
def make_archive(base_name, format, root_dir=None, base_dir=None, verbose=0, dry_run=0, owner=None, group=None, logger=None): """Create an archive file (eg. zip or tar). 'base_name' is the name of the file to create, minus any format-specific extension; 'format' is the archive format: one of "zip", "tar", "bztar" or "gztar". 'root_dir' is a directory that will be the root directory of the archive; ie. we typically chdir into 'root_dir' before creating the archive. 'base_dir' is the directory where we start archiving from; ie. 'base_dir' will be the common prefix of all files and directories in the archive. 'root_dir' and 'base_dir' both default to the current directory. Returns the name of the archive file. 'owner' and 'group' are used when creating a tar archive. By default, uses the current owner and group. """ save_cwd = os.getcwd() if root_dir is not None: if logger is not None: logger.debug("changing into '%s'", root_dir) base_name = os.path.abspath(base_name) if not dry_run: os.chdir(root_dir) if base_dir is None: base_dir = os.curdir kwargs = {'dry_run': dry_run, 'logger': logger} try: format_info = _ARCHIVE_FORMATS[format] except KeyError: raise ValueError("unknown archive format '%s'" % format) func = format_info[0] for arg, val in format_info[1]: kwargs[arg] = val if format != 'zip': kwargs['owner'] = owner kwargs['group'] = group try: filename = func(base_name, base_dir, **kwargs) finally: if root_dir is not None: if logger is not None: logger.debug("changing back to '%s'", save_cwd) os.chdir(save_cwd) return filename
# 打包压缩文件 # 语法：def make_archive(base_name, format, root_dir=None, base_dir=None, verbose=0, # dry_run=0, owner=None, group=None, logger=None) shutil.make_archive('d:/wongdu', 'zip', 'd:/caiyun') """ 补充说明： base_name: 打包压缩后路径和文件名，不指定路径，则默认打包压缩到当前目录 format: 打包压缩格式, python3支持zip、tar、gztar root_dir: 要打包压缩的路径，默认为当前路径 owner、group: 指定压缩包的所有者 logger: 用于记录日志，通常是logging.logger对象 """
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