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, stop, 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.