Os.walk() in python
os.walk() is a function in Python's OS module that generates the file names in a directory tree by walking the tree either top-down or bottom-up. It can be used to search for files in a directory hierarchy or to perform operations on all files in a directory tree.
The parameters for os.walk():
os.walk() returns a generator object that yields a 3-tuple (dirpath, dirnames, filenames) for each directory in the directory tree. Here's what each part of the tuple represents:
Here's an example of how to use os.walk() to print the names of all the files in a directory tree:
In this example, os.path.join() is used to join dirpath and filename to create the full path of each file. It ensures that the correct path separator is used, regardless of the operating system.
Some other key points about 'os.walk()' in Python:
The os.walk() can be memory-intensive if the directory tree is very large. If you want to minimize memory usage, you can use a with statement to open each file in the directory tree and process it one at a time, rather than loading all the file names into memory at once. Here's an example
In this example, each file is opened with a statement and processed inside the loop, so only one file is in memory at a time.
The os.walk() can be used to perform various operations on files and directories in a directory tree, such as copying, moving, or deleting files. For example, you can use the shutil module to copy all files in a directory tree to a new location:
This code copies all files in the source_dir directory tree to the dest_dir directory.
If you need to skip certain directories or files during the walk, you can modify the dirnames or filenames lists in-place to remove the unwanted directories or files. For example, if you want to skip all the files with a particular extension, you can use a list comprehension to filter the filenames list:
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