---- Conditionals & Control Flow

30 介绍Python利用有6种比较的方式 == , != , > , >= , < , <=

 2 比较后的结果是True或者是False

 3 练习

    1 把bool_one的值设置为 17 < 118%100

    2 把bool_two的值设置为 100 == 33*3 + 1

    3 把bool_two的值设置为 19 <= 2**4

    4 把bool_four的值设置为 -22 >= -18

    5 把bool_five的值设置为 99 != 98+1

[python]

#Assign True or False as appropriate on the lines below!

bool_one = 17 < 118%100

bool_two = 100 == 33*3+1

bool_three = 19 <= 2**4

bool_four = -22 >= -18

bool_five = 99 != 98+1

31 介绍了比较的两边不只是数值，也可以是两个表达式

2 练习

   1 把bool_one的值设置为 20 + -10*2 > 10%3%2

   2 把bool_two的值设置为 (10+17)**2 == 3**6

   3 把bool_two的值设置为 1**2**3 <= -(-(-1))

   4 把bool_four的值设置为 40/20*4 >= -4**2

   5 把bool_five的值设置为 100**0.5 != 6+4

[python]

Assign True or False as appropriate on the lines below!

bool_one = 20+-10*2 > 10%3%2

bool_two = (10+17)2 == 36

bool_three = 123 <= -(-(-1))

bool_four = 40/20*4 >= -4**2

bool_five = 100**0.5 != 6+4

32 介绍了Python里面还有一种数据类型是booleans，值为True或者是False

2 练习：根据题目的意思来设置右边的表达式

[python]

Create comparative statements as appropriate on the lines below!

Make me true!

bool_one = 1 <= 2

Make me false!

bool_two = 1 > 2

Make me true!

bool_three = 1 != 2

Make me false!

bool_four = 2 > 2

Make me true!

bool_five = 4 < 5

33 介绍了第一种连接符and的使用，只有and的两边都是True那么结果才能为True

2 练习

   1 设置变量bool_one的值为False and False

   2 设置变量bool_two的值为-(-(-(-2))) == -2 and 4 >= 16**0.5

   3 设置变量bool_three的值为19%4 != 300/10/10 and False

   4 设置变量bool_four的值为-(1**2) < 2**0 and 10%10 <= 20-10*2

   5 设置变量bool_five的值为True and True

[python]

bool_one = False and False

bool_two = -(-(-(-2))) == -2 and 4 >= 16**0.5

bool_three = 19%4 != 300/10/10 and False

bool_four = -(12) < 20 and 10%10 <= 20-10*2

bool_five = True and True

34 介绍了第二种连接符or的使用，只要or的两边有一个True那么结果才能为True

2 练习

   1 设置变量bool_one的值为2**3 == 108%100 or 'Cleese' == 'King Arthur'

   2 设置变量bool_two的值为True or False

   3 设置变量bool_three的值为100**0.5 >= 50 or False

   4 设置变量bool_four的值为True or True

   5 设置变量bool_five的值为1**100 == 100**1 or 3*2*1 != 3+2+1

[python]

bool_one = 2**3 == 108%100 or 'Cleese' == 'King Arthur'

bool_two = True or False

bool_three = 100**0.5 >= 50 or False

bool_four = True or True

bool_five = 1100 == 1001 or 321 != 3+2+1

35 介绍第三种连接符not , 如果是not True那么结果为False，not False结果为True

2 练习

   1 设置变量bool_one的值为not True

   2 设置变量bool_two的值为not 3**4 < 4**3

   3 设置变量bool_three的值为not 10%3 <= 10%2

   4 设置变量bool_four的值为not 3**2+4**2 != 5**2

   5 设置变量bool_five的值为not not False

[python]

bool_one = not True

bool_two = not 34 < 43

bool_three = not 10%3 <= 10%2

bool_four = not 32+42 != 5**2

bool_five = not not False

36 介绍了由于表达式很多所以我们经常使用()来把一些表达式括起来，这样比较具有可读性

2 练习

   1 设置变量bool_one的值为False or (not True) and True

   2 设置变量bool_two的值为False and (not True) or True 

   3 设置变量bool_three的值为True and not (False or False)

   4 设置变量bool_four的值为not (not True) or False and (not True)

   5 设置变量bool_five的值为False or not (True and True)

[python]

bool_one = False or (not True) and True

bool_two = False and (not True) or True

bool_three = True and not (False or False)

bool_four = not (not True) or False and (not True)

bool_five = False or not (True and True)

第八节

1 练习：请至少使用and，or，not来完成以下的练习

[python]

Use boolean expressions as appropriate on the lines below!

Make me false!

bool_one = not ((1 and 2) or 3)

Make me true!

bool_two = not (not((1 and 2) or 3))

Make me false!

bool_three = not ((1 and 2) or 3)

Make me true!

bool_four = not (not((1 and 2) or 3))

Make me true!

bool_five = not (not((1 and 2) or 3)