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How to Think CS

Chapter 1

TermDefinition
activecode A unique interpreter environment that allows Python to be executed from within a web browser.
algorithm A general step by step process for solving a problem.
bug An error in a program.
byte code An intermediate language between source code and object code. Many modern languages first compile source code into byte code and then interpret the byte code with a program called a virtual machine.
codelens An interactive environment that allows the user to control the step by step execution of a Python program
comment Information in a program that is meant for other programmers (or anyone reading the source code) and has no effect on the execution of the program.
compile To translate a program written in a high-level language into a low-level language all at once, in preparation for later execution.
debugging The process of finding and removing any of the three kinds of programming errors. exception
exception Another name for a runtime error.
executable Another name for object code that is ready to be run.
formal language Any one of the languages that people have designed for specific purposes, such as representing mathematical ideas or computer programs; all programming languages are formal languages.
high-level language A programming language like Python that is designed to be easy for humans to read and write.
interpret To execute a program in a high-level language by translating it one line at a time.
low-level language A programming language that is designed to be easy for a computer to execute; also called machine language or assembly language.
natural language Any one of the languages that people speak that evolved organically.
object code The output of the compiler after it translates the program.
parse To examine a program and analyze the syntactic structure.
portability A property of a program that can run on more than one kind of computer.
print function A script that causes the Python interpreter to display a value on its output device.
problem solving The process of formulating a problem, finding a solution, and expressing the solution.
program A sequence of instructions that specifies to a computer actions and computations to be performed.
programming language A formal notation for representing solutions.
Python shell An interactive user interface to the Python interpreter. The user of a Python shell types commands at the prompt (>>>), and presses the return key to send these commands immediately to the interpreter for processing.
runtime error An error that does not occur until the program has started to execute but that prevents the program from continuing.
semantic error An error in a program that makes it do something other than what the programmer intended.
semantics The meaning of a program.
shell mode A style of using Python where we type expressions at the command prompt, and the results are shown immediately.
source code A program, stored in a file, in a high-level language before being compiled or interpreted.
syntax The structure of a program.
syntax error An error in a program that makes it impossible to parse — and therefore impossible to interpret.
token One of the basic elements of the syntactic structure of a program, analogous to a word in a natural language.
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