第一节
1 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
#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
第二节
1 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
# Assign True or False as appropriate on the lines below! bool_one = 20+-10*2 > 10%3%2 bool_two = (10+17)**2 == 3**6 bool_three = 1**2**3 <= -(-(-1)) bool_four = 40/20*4 >= -4**2 bool_five = 100**0.5 != 6+4
第三节
1 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
# 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
第四节
1 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
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 = -(1**2) < 2**0 and 10%10 <= 20-10*2 bool_five = True and True
第五节
1 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
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 = 1**100 == 100**1 or 3*2*1 != 3+2+1
第六节
1 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
bool_one = not True bool_two = not 3**4 < 4**3 bool_three = not 10%3 <= 10%2 bool_four = not 3**2+4**2 != 5**2 bool_five = not not False
第七节
1 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)
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
# 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)
第九节
1 介绍了条件语句if
2 if的格式如下, 比如
if 8 < 9:
print "Eight is less than nine!"
3 另外还有这elif 以及else，格式如下
if 8 < 9:
print "I get printed!"
elif 8 > 9:
print "I don't get printed."
else:
print "I also don't get printed!"
4 练习：设置变量response的值为'Y'
response = 'Y'
answer = "Left"
if answer == "Left":
print "This is the Verbal Abuse Room, you heap of parrot droppings!"
# Will the above print statement print to the console?
# Set response to 'Y' if you think so, and 'N' if you think not.
第十节
1 介绍了if的格式
if EXPRESSION:
# block line one
# block line two
# et cetera
2 练习：在两个函数里面加入两个加入条件语句，能够成功输出
def using_control_once():
if 1 > 0:
return "Success #1"
def using_control_again():
if 1 > 0:
return "Success #2"
print using_control_once()
print using_control_again()
第十一节
1 介绍了else这个条件语句
2 练习：完成函数里面else条件语句
answer = "'Tis but a scratch!"
def black_knight():
if answer == "'Tis but a scratch!":
return True
else:
return False # Make sure this returns False
def french_soldier():
if answer == "Go away, or I shall taunt you a second time!":
return True
else:
return False # Make sure this returns False
第十二节
1 介绍了另外一种条件语句elif的使用
2 练习：在函数里面第二行补上answer > 5， 第四行补上answer < 5 , 从而完成这个函数
def greater_less_equal_5(answer):
if answer > 5:
return 1
elif answer < 5:
return -1
else:
return 0
print greater_less_equal_5(4)
print greater_less_equal_5(5)
print greater_less_equal_5(6)
第十三节
1 练习：利用之前学的比较以及连接符以及条件语句补全函数。所有的都要出现至少一次
def the_flying_circus():
# Start coding here!
if 1 < 2 and not False:
return True
elif 1 == 1 or 1 != 2 or 1 < 2 or 1 <= 2 or 1 > 2 or 1 >= 2:
return True
else:
return False