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Introduction to
                         7                     Programming python


















                                 Your Aim


                                 to learn about:
                                        Computer Languages              Language Translator
                                        Python                              Features of Python
                                         Installing Python                  Programming in Python
                                           Input and Output                 Variables in Python
                                           Data Types                         Comments in Python
                                           Operators                            Precedence of Operators
                                            Some More Programs

                  We have already learnt that computers follow certain steps to perform any task and when we
                  perform a sequence of steps to solve any problem, it is called an algorithm. Let us now learn
                  about computer languages used to develop programs.

                      COMPUTER LANGUAGES
                  To communicate with the computers, we need some special languages which are called computer
                  languages or programming languages. A computer language is the medium by which instructions
                  are transmitted to the computer to perform a specific task. It is a set of words, symbols and codes
                  that the computer can understand. It is used to write computer programs. A computer program is

                  a set of instructions written in a programming language. The process of writing a program is called
                  programming. People who write the programs are called programmers.
                  There are a number of programming languages worldwide. Some languages were developed
                  for specific computers, others were developed for specific uses such as scientific or business
                  applications. Computer languages are classified into two major categories:

                                                   Computer Languages





                          Low-Level Language                                    High-Level Language




                       Machine           Assembly        Third Generation  Fourth-Generation             Natural
                    Language (1GL)    Language (2GL)      Language (3GL)       Language (4GL)       Language (5GL)


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