5-1条件测试：
pizza = 'cheese'
print("Is pizza == 'cheese'? I predict True.")
print(pizza == 'cheese')
print("Is pizza == 'mushroom'? I predict False.")
print(pizza == 'mushroom')
5-2更多的条件测试：
str1 = 'Happy'
str2 = 'happy'
car = ['Das', 'Toyota', 'Audi']
print(str1 == str2)
print(str1.lower() == str2)
print(1 == 2)
print(1 != 2)
print(1 > 2)
print(1 < 2)
print(1 >= 2)
print(1 <= 2)
print(1 > 2 and 1 > 0)
print(1 > 2 or 1 > 0)
print('Das' in car)
print('BMW' in car)
print('BMW' not in car)
print('Das' not in car)
5-5外星人颜色#3
alien_color = 'green'
if alien_color == 'green':
print("5 points")
elif alien_color == 'yellow':
print("10 points")
else:
print("15 points")
5-10检查用户名：
current_user = ['A', 'B', 'C', 'D', 'E']
new_user = ['a', 'B' , 'F', 'G', 'H']
for i in new_user:
if i.upper() in current_user:
print(i + " is already used.")
else:
print(i + " is not used")
6-1人：
people = {"first_name" : 'Zhehao', 'last_name' : 'Zhong','age' : 20, 'city':'GuangZhou'}
print(people)
6-5河流：
river = {"nile":'Egypt','Yangtze':'China','Missisipi':'America'}
for k,v in river.items():
print(k + ' runs through ' + v)
for k,v in river.items():
print(k)
for k,v in river.items():
print(v)
6-7人：
people_1 = {"first_name" : 'a', 'last_name' : 'b','age' : 20, 'city':'GuangZhou'}
people_2 = {"first_name" : 'c', 'last_name' : 'd','age' : 20, 'city':'GuangZhou'}
people_3 = {"first_name" : 'e', 'last_name' : 'f','age' : 20, 'city':'GuangZhou'}
people = [people_1, people_2, people_3]
for p in people:
print(p)
6-11城市：
cities = {
'gz':{
'c':1,
'p':1,
'f':1
},
'sh':{
'c':2,
'p':2,
'f':2
},
'bj':{
'c':3,
'p':3,
'f':3
}
}
for i in cities.items():
print(i)