教材第五章课后习题

代码：

#5.1
#print(5.1)
#print("一个简单的条件测试，可以理解比较后为何返回True或False")
#有点长，以及简单，就不写了

#5.2
print(5.2)
#前面几个都比较简单，就不写了
#写一下特定的值在列表中的查找
list2 = ["one","two","three",1,2,3]
if "one" in list2:
	print("one in list.")
if 2 in list2:
	print("2 in list.")
if "four" not in list2:
	print("four not in list.")
print()

#5.3
print(5.3)
colors = ['green','red','yellow']
alien_color = "green"
if alien_color == "green":
	print("you got 5 points.") 
print()

#5.4
print(5.4)
alien_color = "green"
if alien_color == "green":
	print("you got 5 points.(green)")
else:
	print("you got 10 points.(not green)")
alien_color = "yellow"
if alien_color == "green":
	print("you got 5 points.(green)")
else:
	print("you got 10 points.(not green)")
print()

#5.5
print(5.5)
for alien_color in colors:
	if alien_color == "green":
		print("you got 5 points.(green)")
	elif alien_color == "yellow":
		print("you got 10 points.(yellow)")
	else:
		print("you got 15 points.(red)")
print()

#5.6
print(5.6)
age = 18
print("age =",age)
if age < 2:
	print("婴儿")
elif 2 <= age < 4:
	print("蹒跚学步")
elif 4 <= age < 13:
	print("儿童")
elif 13 <= age < 20:
	print("青少年")
elif 20 <= age < 65:
	print("成年人")
elif 65 <= age:
	print("老年人")
print()

#5.7
print(5.7)
favorite_fruits = ["apple","orange","melon"]
if "beef" in favorite_fruits:
	print("You really like beef.")
if "banana" in favorite_fruits:
	print("You really like banana.")
if "apple" in favorite_fruits:
	print("You really like apple.")
if "orange" in favorite_fruits:
	print("You really like orange.")
if "melon" in favorite_fruits:
	print("You really like melon.")
print()

#5.8
print(5.8)
list8 = ['admin','boy','cat','dog','egg']
str8 = 'admin'
if str8 == 'admin':
	print("Hello admin,welcome back.")
else:
	print("Hello,",str8,".")
str8 = 'dog'
if str8 == 'admin':
	print("Hello admin,welcome back.")
else:
	print("Hello",end=" ")
	print(str8,end="")
	print(".")
print()

#5.9
print(5.9)
list8.clear()
if not list8:
	print("We need to find some users!")
else:
	if str8 == 'admin':
		print("Hello admin,welcome back.")
	else:
		print("Hello",end=" ")
		print(str8,end="")
		print(".")
print()

#5.10
print("5.10")
current_users = ["apple","banana","cat","dog","egg"]
new_users = ["ApPle","boy","cat","dinner","eleven"]
current_users_lower = [current_user.lower() for current_user in current_users]
for new_user in new_users:
	if new_user.lower() in current_users_lower:
		print("The user name has been used.")
	else:
		print("The user name hasn't been used.")
print()

#5.11
print(5.11)
list11 = []
for i in range(1,10):
	list11.append(i)
print(list11)
for i in list11:
	if i == 1:
		print("1st",end=" ")
	elif i == 2:
		print("2nd",end=" ")
	else:
		print(i,end="")
		print("th",end=" ")
print()#5.1
#print(5.1)
#print("一个简单的条件测试，可以理解比较