Lemmatization in linguistics is the process of grouping together the different inflected forms of a word so they can be analyzed as a single item.

Hashlib is a Python module that implements a common interface to many different secure hash and message digest algorithms.

A pty is a pseudo-terminal - it's a software implementation that appears to the attached program like a terminal, but instead of communicating directly with a "real" terminal, it transfers the input and output to another program.

The QNetworkAccessManager class allows the application to send network requests and receive replies. QNetworkAccessManager class which holds the common configuration and settings for the requests it sends. It contains the proxy and cache configuration, as well as the signals related to such issues, and reply signals that can be used to monitor the progress of a network operation. One QNetworkAccessManager should be enough for the whole Qt application.

fseek is a C function belonging to the ANSI C standard library, and included in stdio.h. Its purpose is to change the file position indicator for the specified file or stream.

Netfilter is a set of hooks inside the Linux kernel that allows kernel modules to register callback functions with the network stack. A registered callback function is then called back for every packet that traverses the respective hook within the network stack.

Build-tools are tools designed to help and automate the process of compiling, packaging and deploying software.

A capability supported by some operating systems that allows one process to communicate with another process. The processes can be running on the same computer or on different computers connected through a network. It enables one application to control another application, and for several applications to share the same data without interfering with one another.

Anychart is an HTML5 charting library.

The dateutil module provides powerful extensions to the standard datetime module, available as an extension module which is compatible with Python 2.3+.