Python Unit 1

>>>name = input("xxx:")

Input string example

print(<expression>)

Print function

Translator

converts program into executable code

Data

Information

Expressions or statements

Python inputs are

Features of algorithm

- consist of a finite number of instructions - each individual instruction is well defined (can be executed by computing agent) - describes a process that eventually halts after arriving to solution - solves a general class of problems

Basic components of hardware

- memory - central processing unit (CPU) - set of input/output devices

Steps of algorithm

1. input 2. transform information according to well-defined rules 3. output

Binary digits

Information is stored in

int

Integer string type

Guido van Rossum

Invented Python programming language

Machine code

Program stored in memory represented in binary digits, or

.py

Python extension

interpreted language

Python is a

program libraries

Save/share Python files in

Algorithm

Sequence of steps that describes computational processes

Python

a high-level general-purpose programming language for solving problems on modern computer systems

Mainframe computers

consisted of vacuum tubes, wires, and plugs. filled entire rooms

IDLE

easiest way to open a Python shell

Run-time system

executes program if no errors are found

float

floating-point numbers type

Computing agent

human being

Random access memory

internal/primary memory

External/secondary memory

magnetic, semiconductor, or optical

operating system

most important system software

Hardware

physical devices required to execute algorithms

High level programming language

resembles English and allow the author to express algorithms in a form that people can understand

Syntax

rules for forming sentences in a language

Shell

runs simple Python expressions and statements

Software

set of algorithms, represented as programs in particular programming languages

Loader

takes a set of machine language instructions as input and loads them into the appropriate memory locations

How computers communicate

through ports that connect them to networks

Syntax errors

translator checks for

Applications

web browsers, word processors, spreadsheets, etc...

Text editor

where high-level language statements are written