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Commit f7e05e0

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‎CH4/Checkpoints

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#4.1
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< , > , <= , >= , == , !=
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#4.2
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i = 1
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j = 0
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b1 = True
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b2 = False
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#4.3
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random.randint(0, 19)
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#4.4
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random.randint(10, 19)
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#4.5
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random.randint(10, 50)
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#4.6
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random.randint(0, 1)
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#4.7
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if y >0:
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x = 1
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#4.8
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if score > 90:
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pay *= 1.03
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#4.9
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if score > 90:
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pay *= 1.03
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eles:
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pay *= 1.01
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#4.10
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(a): is even.
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is odd.
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(b): is odd.
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#4.11
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if x =3 and y =2 --> x is 3
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if x =3 and y =4 --> z is 7
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if x =2 and y =2 --> no output
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#4.12
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if x = 2 and y = 4 --> x is 2
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if x = 3 and y = 2 --> no output
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if x = 3 and y = 3 --> z is 6
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#4.13
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The conditions are tested in the wrong orders
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#4.14
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A and C are equivalent, but B and D are incorrectly indented.
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#4.15
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newLine = (count % 10 == 0)
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#4.16
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Both are correct. B is better
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Both conditions in A are tested. In B the condition is tested only once.
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#4.17
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in code (a):
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if number = 14 --> 14 is even
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if number = 15 --> 15 is multiple of 5
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if number = 30 --> 30 is is even
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30 is multiple of 5
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in code (b):
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if number = 14 --> 14 is even
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if number = 15 --> 15 is multiple of 5
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if number = 30 --> 30 is is even
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#4.18
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yes
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#4.19
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Causes a runtime error, because tax will not be created.
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#4.20
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True and (3 > 4) --> False
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not (x > 0) and (x > 0) --> False
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(x > 0) or (x < 0) --> True
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(x != 0) or (x == 0) --> True
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(x >= 0) or (x < 0) --> True
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(x != 1) == not (x == 1) --> True
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#4.21
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(num > 1) and (num < 100)
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#4.22
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((num > 1) and (num < 100)) or (num < 0)
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#4.23
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x >= y >= 0 --> False
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x <= y >= 0 --> True
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x != y == 5 --> True
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(x != 0) or (x == 0) --> True
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#4.24
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Yes
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#4.25
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if ch = 'A' --> True
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if ch = 'p' --> False
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if ch = 'E' --> True
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if ch = '5' --> False
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#4.26
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(x < y and y < z) is True
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(x < y or y < z) is True
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not (x < y) is False
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(x < y < z) is True
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not (x < y < z) is False
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#4.27
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age > 13 and age < 18
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#4.28
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weight > 50 or height > 160
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#4.29
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weight > 50 and height > 160
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#4.30
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(weight > 50 or height > 160) and not (weight > 50 and height > 160)
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#4.31
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Sorted
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#4.32
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(a)ticketPrice = 20 if ages >= 16 else 10
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(b)print(count, end = "\n" if count % 10 == 0 else " ")
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#4.33
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(a) if x >10:
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score = 3 * scale
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else:
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score = 4 * scale
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(b) if income > 10000:
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tax = income * 0.2
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else:
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tax = income * 0.17 + 1000
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(c) if number % 3 == 0:
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print(i)
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else:
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print(j)
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#4.34
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The precedence order of the Boolean operators are not, and, or in this order.
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True
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True
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#4.35
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True
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#4.36
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False
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False
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#4.37
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Is (x > 0 and x < 10) the same as ((x > 0) and (x < 10))? Yes
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Is (x > 0 or x < 10) the same as ((x > 0) or (x < 10))? Yes
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Is (x > 0 or x < 10 and y < 0) the same as (x > 0 or (x < 10 and y < 0))? yes

‎CH4/EX4.1.py

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# (Algebra: solve quadratic equations) The two roots of a quadratic equation, for
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# example, can be obtained using the following formula:
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# is called the discriminant of the quadratic equation. If it is positive, the
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# equation has two real roots. If it is zero, the equation has one root. If it is negative,
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# the equation has no real roots.
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# Write a program that prompts the user to enter values for a, b, and c and displays
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# the result based on the discriminant. If the discriminant is positive, display two
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# roots. If the discriminant is 0, display one root. Otherwise, display The equation
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# has no real roots.
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import math
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a, b, c = eval(input("Enter a, b, c: "))
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discriminant = math.pow(b, 2) - 4 * a * c
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if discriminant > 0:
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r1 = (-b + math.sqrt(b ** 2 - 4 * a * c)) / (2 * a)
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r2 = (-b - math.sqrt(b ** 2 - 4 * a * c)) / (2 * a)
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print("The roots are", format(r1, "0.6f"), format(r2, "0.6f"))
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elif discriminant == 0:
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r1 = (-b + math.sqrt(b ** 2 - 4 * a * c)) / (2 * a)
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print("The root is", format(r1, "0.6f"))
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else:
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print("The equation has no real roots")

‎CH4/EX4.10.py

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# (Game: multiplication quiz) Listing 4.4, SubtractionQuiz.py, randomly generates
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# a subtraction question. Revise the program to randomly generate a multiplication
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# question with two integers less than 100.
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import random
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n1, n2 = random.randint(0, 99), random.randint(0, 99)
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s = "What is " + str(n1) + " * " + str(n2) + " ? "
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res = eval(input(s))
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if res == (n1 * n2):
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print("You are correct!")
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else:
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print("You are wrong")
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print(str(n1), "*", str(n2), "=", str(n1 * n2))

‎CH4/EX4.11.py

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# (Find the number of days in a month) Write a program that prompts the user to
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# enter the month and year and displays the number of days in the month. For example,
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# if the user entered month 2 and year 2000, the program should display that
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# February 2000 has 29 days. If the user entered month 3 and year 2005, the program
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# should display that March 2005 has 31 days.
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month, year = eval(input("Enter month and year: "))
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days = 0
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isLeapYear = (year % 4 == 0 and year % 100 != 0) or (year % 400 == 0)
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if month == 1:
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month = "January"
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days = 31
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elif month == 2:
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month = "February"
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if isLeapYear:
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days = 29
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else:
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days = 28
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elif month == 3:
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month = "March"
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days = 31
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elif month == 4:
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month = "April"
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days = 30
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elif month == 5:
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month = "May"
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days = 31
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elif month == 6:
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month = "June"
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days = 30
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elif month == 7:
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month = "July"
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days = 31
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elif month == 8:
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month = "Augustus"
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days = 30
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elif month == 9:
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month = "September"
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days = 31
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elif month == 10:
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month = "October"
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days = 30
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elif month == 11:
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month = "November"
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days = 31
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elif month == 12:
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month = "December"
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days = 30
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print(month, year, "has", days, "days")

‎CH4/EX4.12.py

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# 4.12 (Check a number) Write a program that prompts the user to enter an integer and
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# checks whether the number is divisible by both 5 and 6, divisible by 5 or 6, or just
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# one of them (but not both).
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n = int(input("Enter an integer: "))
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print("Is", n, " divisible by 5 and 6?", n % 5 == 0 and n % 6 == 0)
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print("Is", n, "divisible by 5 or 6?", n % 5 == 0 or n % 6 == 0)
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print("Is", n, "divisible by 5 or 6, but not both?", (n % 5 == 0 and n % 6 != 0) or (n % 5 != 0 and n % 6 == 0))

‎CH4/EX4.13.py

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# 4.13 (Financial application: compute taxes) Listing 4.7, ComputeTax.py, gives the
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# source code to compute taxes for single filers. Complete Listing 4.7 to give the
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# complete source code for the other filing statuses.
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import sys
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# Prompt the user to enter filing status
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status = eval(input(
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"(0-single filer, 1-married jointly,\n" +
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"2-married separately, 3-head of household)\n" +
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"Enter the filing status: "))
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# Prompt the user to enter taxable income
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income = eval(input("Enter the taxable income: "))
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# Compute tax
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tax = 0
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if status == 0: # Compute tax for single filers
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if income <= 8350:
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tax = income * 0.10
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elif income <= 33950:
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tax = 8350 * 0.10 + (income - 8350) * 0.15
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elif income <= 82250:
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tax = 8350 * 0.10 + (33950 - 8350) * 0.15 + \
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(income - 33950) * 0.25
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elif income <= 171550:
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tax = 8350 * 0.10 + (33950 - 8350) * 0.15 + \
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(82250 - 33950) * 0.25 + (income - 82250) * 0.28
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elif income <= 372950:
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tax = 8350 * 0.10 + (33950 - 8350) * 0.15 + \
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(82250 - 33950) * 0.25 + (171550 - 82250) * 0.28 + \
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(income - 171550) * 0.33
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else:
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tax = 8350 * 0.10 + (33950 - 8350) * 0.15 + \
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(82250 - 33950) * 0.25 + (171550 - 82250) * 0.28 + \
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(372950 - 171550) * 0.33 + (income - 372950) * 0.35
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elif status == 1: # Compute tax for married file jointly
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if income <= 16700:
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tax = income * 0.10
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elif income <= 67900:
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tax = 16700 * 0.10 + (income - 16700) * 0.15
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elif income <= 137050:
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tax = 16700 * 0.10 + (67900 - 16700) * 0.15 + \
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(income - 67900) * 0.25
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elif income <= 208850:
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tax = 16700 * 0.10 + (67900 - 16700) * 0.15 + \
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(137050 - 6700) * 0.25 + (income - 137050) * 0.28
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elif income <= 372950:
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tax = 16700 * 0.10 + (67900 - 16700) * 0.15 + \
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(137050 - 67900) * 0.25 + (208850 - 137050) * 0.28 + \
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(income - 208850) * 0.33
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else:
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tax = 16700 * 0.10 + (67900 - 16700) * 0.15 + \
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(137050 - 67900) * 0.25 + (208850 - 137050) * 0.28 + \
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(372950 - 208850) * 0.33 + (income - 372950) * 0.35
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elif status == 2: # Compute tax for married separately
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if income <= 8350:
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tax = income * 0.10
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elif income <= 33950:
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tax = 8350 * 0.10 + (income - 8350) * 0.15
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elif income <= 68525:
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tax = 8350 * 0.10 + (33950 - 8350) * 0.15 + \
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(income - 33950) * 0.25
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elif income <= 104425:
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tax = 8350 * 0.10 + (33950 - 8350) * 0.15 + \
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(68525 - 33950) * 0.25 + (income - 68525) * 0.28
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elif income <= 186475:
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tax = 8350 * 0.10 + (33950 - 8350) * 0.15 + \
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(68525 - 33950) * 0.25 + (104425 - 68525) * 0.28 + \
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(income - 104425) * 0.33
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else:
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tax = 8350 * 0.10 + (33950 - 8350) * 0.15 + \
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(68525 - 33950) * 0.25 + (104425 - 68525) * 0.28 + \
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(186475 - 104425) * 0.33 + (income - 186475) * 0.35
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elif status == 3: # Compute tax for head of household
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if income <= 11950:
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tax = income * 0.10
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elif income <= 45500:
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tax = 11950 * 0.10 + (income - 11950) * 0.15
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elif income <= 117450:
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tax = 11950 * 0.10 + (45500 - 11950) * 0.15 + \
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(income - 45500) * 0.25
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elif income <= 190200:
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tax = 11950 * 0.10 + (45500 - 11950) * 0.15 + \
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(117450 - 45500) * 0.25 + (income - 117450) * 0.28
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elif income <= 372950:
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tax = 11950 * 0.10 + (45500 - 11950) * 0.15 + \
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(117450 - 45500) * 0.25 + (104425 - 117450) * 0.28 + \
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(income - 192200) * 0.33
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else:
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tax = 11950 * 0.10 + (45500 - 11950) * 0.15 + \
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(117450 - 45500) * 0.25 + (192200 - 117450) * 0.28 + \
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(186475 - 192200) * 0.33 + (income - 372950) * 0.35
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else:
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print("Error: invalid status")
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sys.exit()
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# Display the result
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print("Tax is", format(tax, ".2f"))

‎CH4/EX4.14.py

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# 4.14 (Game: heads or tails) Write a program that lets the user guess whether a flipped
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# coin displays the head or the tail. The program randomly generates an integer 0 or
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# 1, which represents head or tail. The program prompts the user to enter a guess
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# and reports whether the guess is correct or incorrect.
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import random
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g = random.randint(0, 1)
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guess = int(input("Guess Head(0) or Tail(1): "))
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if g == guess:
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print("You are right. The guess is ", end="Head" if g == 0 else "Tail")
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else:
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print("Wrong. The guess is ", end="Head" if g == 0 else "Tail")

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