class QDirIterator

The QDirIterator class provides an iterator for directory entrylists. More…

Synopsis

Methods

Note

This documentation may contain snippets that were automatically translated from C++ to Python. We always welcome contributions to the snippet translation. If you see an issue with the translation, you can also let us know by creating a ticket on https:/bugreports.qt.io/projects/PYSIDE

Detailed Description

Warning

This section contains snippets that were automatically translated from C++ to Python and may contain errors.

You can use QDirIterator to navigate entries of a directory one at a time. It is similar to entryList() and entryInfoList() , but because it lists entries one at a time instead of all at once, it scales better and is more suitable for large directories. It also supports listing directory contents recursively, and following symbolic links. Unlike entryList() , QDirIterator does not support sorting.

The QDirIterator constructor takes a QDir or a directory as argument. After construction, the iterator is located before the first directory entry. Here’s how to iterate over all the entries sequentially:

it = QDirIterator("/etc", QDirIterator.Subdirectories)
while it.hasNext():
    dir = it.next()
    print(dir)
    # /etc/.
    # /etc/..
    # /etc/X11
    # /etc/X11/fs
    # ...

Here’s how to find and read all files filtered by name, recursively:

it = QDirIterator("/sys", QStringList() << "scaling_cur_freq", QDir.NoFilter, QDirIterator.Subdirectories)
while it.hasNext():
    f = QFile(it.next())
    f.open(QIODevice.ReadOnly)
    print(f.fileName(), f.readAll().trimmed().toDouble() / 1000, "MHz")

The next() and nextFileInfo() functions advance the iterator and return the path or the QFileInfo of the next directory entry. You can also call filePath() or fileInfo() to get the current file path or QFileInfo without first advancing the iterator. The fileName() function returns only the name of the file, similar to how entryList() works.

Unlike Qt’s container iterators, QDirIterator is uni-directional (i.e., you cannot iterate directories in reverse order) and does not allow random access.

Note

This class is deprecated and may be removed in a Qt release. Use QDirListing instead.

See also

QDir entryList()

class IteratorFlag

(inherits enum.Flag) This enum describes flags that you can combine to configure the behavior of QDirIterator .

Constant

Description

QDirIterator.NoIteratorFlags

The default value, representing no flags. The iterator will return entries for the assigned path.

QDirIterator.Subdirectories

List entries inside all subdirectories as well.

QDirIterator.FollowSymlinks

When combined with Subdirectories, this flag enables iterating through all subdirectories of the assigned path, following all symbolic links. Symbolic link loops (e.g., “link” => “.” or “link” => “..”) are automatically detected and ignored.
__init__(dir[, flags=QDirIterator.IteratorFlag.NoIteratorFlags])
Parameters:

Constructs a QDirIterator that can iterate over dir's entrylist, using dir's name filters and regular filters. You can pass options via flags to decide how the directory should be iterated.

By default, flags is NoIteratorFlags , which provides the same behavior as in entryList() .

The sorting in dir is ignored.

Note

To list symlinks that point to non existing files, System must be passed to the flags.

See also

hasNext() next() IteratorFlags

__init__(path[, flags=QDirIterator.IteratorFlag.NoIteratorFlags])
Parameters:

Constructs a QDirIterator that can iterate over path. You can pass options via flags to decide how the directory should be iterated.

By default, flags is NoIteratorFlags , which provides the same behavior as in entryList() .

Note

To list symlinks that point to non existing files, System must be passed to the flags.

See also

hasNext() next() IteratorFlags

__init__(path, filter[, flags=QDirIterator.IteratorFlag.NoIteratorFlags])
Parameters:

Constructs a QDirIterator that can iterate over path, with no name filtering and filters for entry filtering. You can pass options via flags to decide how the directory should be iterated.

By default, filters is NoFilter , and flags is NoIteratorFlags , which provides the same behavior as in entryList() .

Note

To list symlinks that point to non existing files, System must be passed to the flags.

See also

hasNext() next() IteratorFlags

__init__(path, nameFilters[, filters=QDir.NoFilter[, flags=QDirIterator.IteratorFlag.NoIteratorFlags]])
Parameters:

  • path – str

  • nameFilters – list of strings

  • filters – Combination of Filter

  • flags – Combination of IteratorFlag

Warning

This section contains snippets that were automatically translated from C++ to Python and may contain errors.

Constructs a QDirIterator that can iterate over path, using nameFilters and filters. You can pass options via flags to decide how the directory should be iterated.

By default, flags is NoIteratorFlags , which provides the same behavior as entryList() .

For example, the following iterator could be used to iterate over audio files:

def audioFileIt(audioPath,{"*.mp3","*.wav"},QDir.Files):

Note

To list symlinks that point to non existing files, System must be passed to the flags.

See also

hasNext() next() IteratorFlags setNameFilters()

fileInfo()
Return type:

QFileInfo

Returns a QFileInfo for the current directory entry.

fileName()
Return type:

str

Returns the file name for the current directory entry, without the path prepended.

This function is convenient when iterating a single directory. When using the Subdirectories flag, you can use filePath() to get the full path.

filePath()
Return type:

str

Returns the full file path for the current directory entry.

hasNext()
Return type:

bool

Returns true if there is at least one more entry in the directory; otherwise, false is returned.

next()
Return type:

str

Advances the iterator to the next entry, and returns the file path of this new entry. If hasNext() returns false, this function does nothing, and returns an empty QString .

You can call fileName() or filePath() to get the current entry’s file name or path, or fileInfo() to get a QFileInfo for the current entry.

Call nextFileInfo() instead of next() if you’re interested in the QFileInfo .

nextFileInfo()
Return type:

QFileInfo

Advances the iterator to the next entry, and returns the file info of this new entry. If hasNext() returns false, this function does nothing, and returns an empty QFileInfo .

You can call fileName() or filePath() to get the current entry’s file name or path, or fileInfo() to get a QFileInfo for the current entry.

Call next() instead of nextFileInfo() when all you need is the filePath() .

path()
Return type:

str

Returns the base directory of the iterator.