In Python 114 11 + 11 5 11 is 1145 11

A Python string literal is always enclosed in double quotes.

The last character of a strings is at position len(s) -1.

A string always contains a single line of text.

In Python 114 11 + 11 5 11 is 1145 11

Python lists are mutable, but strings are not.

ASCII is a standard for representing characters using numeric codes.

The split method breaks a string into a list of substrings, and j oin does the opposite.

A substitution cipher is a good way to keep sensitive information secure.

The add method can be used to add an item to the end of a list.

The process of associating a file with an object in a program is called "reading" the file.

Write an improved version of the chaos . py program from Chapter 1 that allows a user to input two initial values and the number of iterations,and then prints a nicely formatted table showing how the values change over time. For example, if the starting values were . 25 and . 26 with 10 iterations, the table might look like this: index 0.25 0.26 ---------------------------- 1 0 . 731250 0 . 750360 2 0 . 766441 0 . 730547 3 0 . 698135 0 . 767707 4 0 . 821896 0 . 695499 5 0 . 570894 0 . 825942 6 0 . 955399 0 . 560671 7 0 . 166187 0 . 960644 8 0 . 540418 0 . 147447 9 0 . 968629 0 . 490255 10 0.118509 0 . 974630

Write an improved version of the futval . py program from Chapter 2. Your program will prompt the user for the amount of the investment, the annualized interest rate, and the number of years of the investment. The program will then output a nicely formatted table that tracks the value of the investment year by year. Your output might look something like this: Year Value ---------------- 0 $2000 . 00 1 $2200 . 00 2 $2420 . 00 3 $2662 . 00 4 $2928 . 20 5 $3221 . 02 6 $3542 . 12 7 $3897 . 43

Redo any of the previous programming problems to make them batchoriented (using text files for input and output).

Word Count. A common utility on UniX/Linux systems is a small program called ''we." This program analyzes a file to determine the number of lines, words, and characters contained therein. Write your own version of we. The program should accept a file name as input and then print three numbers showing the count of lines, words, and characters in the file.

Write a program to plot a horizontal bar chart of student exam scores. Your program should get input from a file. The first line of the file contains the count of the number of students in the file, and each subsequent line contains a student's last name followed by a score in the range 0-100. Your program should draw a horizontal rectangle for each student where the length of the bar represents the student's score. The bars should all line up on their left-hand edges. Hint: Use the number of students to determine the size of the window and its coordinates. Bonus: label the bars at the left end with the students' names. Computewell Dibblebit Jones Smith

Write a program to draw a quiz score histogram. Your program should read data from a file. Each line of the file contains a number in the range 0-10. Your program must count the number of occurrences of each score and then draw a vertical bar chart with a bar for each possible score (0- 10) with a height corresponding to the count of that score. For example, if 15 students got an 8, then the height of the bar for 8 should be 15. Hint: Use a list that stores the count for each possible score. An example histogram is shown below: