Python zip compression example

Unlike working with the range object, using zip doesn't throw errors when all iterables are of potentially different lengths. Let's verify this as shown below. We now see that the output list only contains 4 tuples and the item 5 from L1 has not been used. So far so good! Let's go ahead and verify this. Observe how we get 1-tuples when we pass in only L1 in the code snippet below:.

When we call the zip function with no arguments, we get an empty list, as shown below:. Let's now create a more intuitive example.

The code snippet below shows how we can use zip to zip together 3 lists and perform meaningful operations. Given a list of fruits, their prices and the quantities that you purchased, the total amount spent on each item is printed out. Now we understand how the zip function works, and we know its limitation that the iterator stops when the shortest iterable is exhausted. Let's now try out an earlier example of L2 containing one item less than L1.

Notice how the item 5 from L1 is still included. But as there's no matching item in L2 , the second element in the last tuple is None. You can customize it more if you want to. For example, you can replace None with a more indicative term such as Empty , Item Not Found , and so on. As time passes, the quantity of data increases. And with Python and the gzip module, we have an easy way to use a powerful, compatible algorithm. Thus: Compression collapses space. And it often reduces the time required to process data.

They compare output sizes. Compression trades time for space. Based on: Python 3 Python program that uses gzip import gzip Open source file. Python program that decompresses file import gzip Use open method.

Subprocess: Python. PAQ Compression Raw: Please notice how the raw string syntax is used for paths—this should be used for Windows-style paths. Python program that calls PAQ compressor import subprocess This program handles compressed fp8 files and non-compressed ones. It decompresses or compresses. File list 18 bytes Compressed from 18 to 22 bytes. Total bytes compressed to bytes. Connect and share knowledge within a single location that is structured and easy to search.

I am new to python. My requirement is to zip with compression all files from a source directory to a target directory. I have used following code from stackOverFlow. It is creating a zip file but it contains the entire inherited directory structure.

I think you are asking to remove the relative paths of files inside the zip file. If you really want that, you could write:. However this is probably a bad idea, since removing all path information would result in a naming conflict if you zip up two files with the same name.

Check the official documentation and it addresses your issues clearly. Note that you can also specifcy the conmpression type on the constructor and it will apply to all files added to the zip archive. The documentation also includes this note: Archive names should be relative to the archive root, that is, they should not start with a path separator.

Also if you had simply entered python zipfile into any search engine, you would have seen the official documentation as one of the first links. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Changed in version 3. The numeric constant for the usual ZIP compression method. This requires the zlib module. The numeric constant for the BZIP2 compression method. This requires the bz2 module. The numeric constant for the LZMA compression method.

This requires the lzma module. However, some tools including older Python releases do not support these compression methods, and may either refuse to process the ZIP file altogether, or fail to extract individual files. Open a ZIP file, where file can be a path to a file a string , a file-like object or a path-like object.

The mode parameter should be 'r' to read an existing file, 'w' to truncate and write a new file, 'a' to append to an existing file, or 'x' to exclusively create and write a new file. If mode is 'x' and file refers to an existing file, a FileExistsError will be raised.

If mode is 'a' and file refers to an existing ZIP file, then additional files are added to it. This is meant for adding a ZIP archive to another file such as python. If mode is 'a' and the file does not exist at all, it is created.

If mode is 'r' or 'a' , the file should be seekable. The compresslevel parameter controls the compression level to use when writing files to the archive. Similar behavior occurs with files newer than , the timestamp is also set to the limit. If the file is created with mode 'w' , 'x' or 'a' and then closed without adding any files to the archive, the appropriate ZIP structures for an empty archive will be written to the file. ZipFile is also a context manager and therefore supports the with statement.

New in version 3. Added support for the 'x' mode. Close the archive file. You must call close before exiting your program or essential records will not be written. Return a ZipInfo object with information about the archive member name. Calling getinfo for a name not currently contained in the archive will raise a KeyError. Return a list containing a ZipInfo object for each member of the archive.

The objects are in the same order as their entries in the actual ZIP file on disk if an existing archive was opened. Access a member of the archive as a binary file-like object. The mode parameter, if included, must be 'r' the default or 'w'. These objects can operate independently of the ZipFile. While a writable file handle is open, attempting to read or write other files in the ZIP file will raise a ValueError. The open , read and extract methods can take a filename or a ZipInfo object. You will appreciate this when trying to read a ZIP file that contains members with duplicate names.

Use io.