Python学习笔记（3）if语句和字典

#encoding=gbk

cities = ['beijing','shanghai','jinan','tianjin']
for city in cities:
    if city == 'beijing':
        print(city.upper())
    else:
        print(city.title())
if 'beijing' in cities:
    print('beijing in cities')

#定义字典
alien_0 = {'color':'green','points': 5}
print(alien_0['color'])
print(alien_0['points'])
print(alien_0)

alien_0['y_position'] = 5
alien_0['x_position'] = 25
print(alien_0)
alien_1 = {}
alien_1['color'] = 'green'
alien_1['points'] = 5
alien_1['x_position'] = 5
alien_1['y_position'] = 25
print(alien_1)

alien_1['color'] = 'yellow'
print(alien_1['color'])
del alien_1['x_position']
print(alien_1)
for key,value in alien_0.items():
    print(key + ":" + str(value))
    
for name in alien_0.keys():
    print(name)
for name in alien_0:
    print(name)
for name in sorted(alien_0.keys()):
    print(name)
for value in alien_0.values():
    print(value)

for value in set(alien_0.values()):
    print(value)
    
alien_0 = {'color':'green','points':5}
alien_1 = {'color':'yellow','points':10}
alien_2 = {'color':'red','points':15}
aliens = [alien_0,alien_1,alien_2]
for alien in aliens:
    print(alien)