Python编程：从入门到实践的动手试一试（第五章）

#5-1 条件测试
car = 'subaru'
print("Is car == 'subaru'? I predict True.")
if car == 'subaru':
print(car == 'subaru')

1
2
3
4
5

#5-2 更多的条件测试
略

1
2

#5-3 外星人颜色#1
alien_color = ['green']
if 'green' in alien_color:
print('恭喜你获得了5个点')

print('版本2')
alien_color = ['red']
if 'green' in alien_color:
print('恭喜你获得了5个点')

1
2
3
4
5
6
7
8
9

#5-4 外星人颜色#2
alien_color = ['green']
if 'green' in alien_color:
print('恭喜你获得了5个点')
else:
print('恭喜你获得10个点')

print('版本2')
alien_color = ['red']
if 'green' in alien_color:
print('恭喜你获得了5个点')
else:
print('恭喜你获得10个点')

1
2
3
4
5
6
7
8
9
10
11
12
13

#5-5 外星人颜色#3
alien_color = ['green']
if 'green' in alien_color:
print('恭喜你获得了5个点')
elif 'yellow' in alien_color:
print('恭喜你获得10个点')
else:
print('恭喜你获得15个点')

print('版本2')
alien_color = ['red']
if 'green' in alien_color:
print('恭喜你获得了5个点')
elif 'yellow' in alien_color:
print('恭喜你获得10个点')
else:
print('恭喜你获得15个点')

print('版本3')
alien_color = ['yellow']
if 'green' in alien_color:
print('恭喜你获得了5个点')
elif 'yellow' in alien_color:
print('恭喜你获得10个点')
else:
print('恭喜你获得15个点')

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26

#5-6 人生的不同阶段
age = 10
if age < 2:
print("婴儿")
elif age < 4:
print('蹒跚学步')
elif age < 13:
print('儿童')
elif age < 20:
print('青少年')
elif age < 65:
print('成年人')
else:
print('老年人')

1
2
3
4
5
6
7
8
9
10
11
12
13
14

#5-7 喜欢的水果
略

1
2

#5-8 以特殊方式跟管理员打招呼
names = ['ergou','tiezhu','shitou','admin','erya']
for name in names:
if name == 'admin':
print('Hello ' + name + ',would you like to see a status report?')
else:
print('Hello ' + name +',thank you for logging in again')

1
2
3
4
5
6
7

#5-9 处理没有用户的情形
names = []
if names:
for name in names:
if name == 'admin':
print('Hello ' + name + ',would you like to see a status report?')
else:
print('Hello ' + name +',thank you for logging in again')
else:
print('We need to find some users!')

1
2
3
4
5
6
7
8
9
10

#5-10 检查用户名
current_users = ['ergou','tiezhu','Shitou','admin','erya']
new_users = ['Ergou','xiaofeng','shitou','shuanzi','dongzi']
linshi = [] #临时储存全部小写的current_users里的元素
#小写的current_users里的元素
for name in current_users:
linshi.append(name.lower())

for name in new_users:
if name.lower() in linshi:
print(name + '已被使用，请输入别的用户名！')
else:
print('该用户名未被使用！')

1
2
3
4
5
6
7
8
9
10
11
12
13

#5-11 序数
numbers = list(range(1,10))
print (numbers)
for number in numbers:
if number == 1:
print(str(number)+'st')
elif number == 2:
print(str(number)+'nd')
elif number == 3:
print(str(number)+'rd')
else:
print(str(number)+'th')