字典

print("----")
alien_0 = {'color':'green','points':5}
print(alien_0['color'])
print(alien_0['points'])

print("----")
alien_0 = {'color':'green'}
print(alien_0['color'])

print("----")
alien_0 = {'color':'green','points':5}
new_points = alien_0['points']
print("You just earned " + str(new_points) + " points!")

print("----")
alien_0 = {'color':'green','points':5}
print(alien_0)
alien_0['x_position'] = 0
alien_0['y_position'] = 25
print(alien_0)

print('----')
alien_0 = {}
alien_0['color'] = 'green'
alien_0['points'] = 5
print(alien_0)

print('----')
alien_0 = {'color':'green'}
print('The alien is ' + alien_0['color'] + '.')
alien_0['color'] = 'yellow'
print('The alien is now ' + alien_0['color'] + '.')

print('----')
alien_0 = {'x_position':0, 'y_position':25, 'speed':'medium'}
print('Original x-position: ' + str(alien_0['x_position']))
if alien_0['speed'] == 'slow':
    x_increment = 1
elif alien_0['speed'] == 'medium':
    x_increment = 2
else:
    x_increment = 3
alien_0['x_position'] = alien_0['x_position'] + x_increment
print('New x-position: ' + str(alien_0['x_position']))

print('----')
alien_0 = {'x_position':0, 'y_position':25, 'speed':'fast'}
print('Original x-position: ' + str(alien_0['x_position']))
if alien_0['speed'] == 'slow':
    x_increment = 1
elif alien_0['speed'] == 'medium':
    x_increment = 2
else:
    x_increment = 3
alien_0['x_position'] = alien_0['x_position'] + x_increment
print('New x-position: ' + str(alien_0['x_position']))

print('----')
alien_0 = {'color':'green', 'points':5}
print(alien_0)
del alien_0['points']
print(alien_0)

print('----')
favorite_languages = {
    'jen': 'python',
    'sarah':    'c',
    'edward':   'ruby',
    'phil':     'python',
    }
print("Sarah's favorite language is " + 
    favorite_languages['sarah'].title() + ".")

print('====')
man = {
    'first_name':   'Yunyi',
    'last_name':    'Zhang',
    'age':          32,
    'city':         'Shanghai',
    }
print(man['first_name'])
print(man['last_name'])
print(man['age'])
print(man['city'])

print('====')
friends = {
    'ZhangYunyi': 0,
    'LiXia': 1,
    'LiuJun': 2,
    'XuYuchi': 3,
    'PanChunyun': 4,
}
print("ZhangYunyi:"+str(friends['ZhangYunyi']))
print("LiXia:"+str(friends['LiXia']))
print("LiuJun:"+str(friends['LiuJun']))
print("XuYuchi:"+str(friends['XuYuchi']))
print("PanChunyun:"+str(friends['PanChunyun']))

print("====")
dics = {
    'if':'if.',
    'print': 'print some text',
    'for': 'for loop',
    'str': 'str to string',
    'and': 'and.',
}
print("if:"+dics['if'])
print("print\n" + dics['print'])
print("for:" + dics['for'])
print("str\n" + dics['str'])
print("and:" + dics['and'])