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Chapter 9 - Summary

Chapter 9 included the following concepts from computing.

• Accumulator Pattern - The accumulator pattern is a set of steps that processes a list of values. One example of an accumulator pattern is the code to reverse the characters in a string.

• Palindrome - A palindrome has the same letters if you read it from left to right as it does if you read it from right to left. An example is "A but tuba".

• String - A string is a collection of letters, numbers, and other characters like spaces inside of a pair of single or double quotes.

Summary of Python Keywords and Functions

• def - The def keyword is used to define a procedure or function in Python. The line must also end with a : and the body of the procedure or function must be indented 4 spaces.

• for - A for loop is a programming statement that tells the computer to repeat a statement or a set of statements. It is one type of loop.

• print - The print statement in Python will print the value of the items passed to it.

• range - The range function in Python returns a list of consecutive values. If the range function is passed one value it returns a list with the numbers from 0 up to and not including the passed number. For example, range(5) returns a list of [0,1,2,3,4]. If the range function is passed two numbers separated by a comma it returns a list including the first number and then up to but not including the second number. For example, range(1,4) returns the list [1, 2, 3]. If it is passed three values range(start,end,step) it returns all the numbers from start to one less than end changing by step. For example, range(0,10,2) returns [0,2,4,6,8].

• while - A while loop is a programming statement that tells the computer to repeat a statement or a set of statements. It repeats the body of the loop while a logical expression is true.

Note

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