Python字典常见操作实例小结【定义、添加、删除、遍历】

#字典 键值对组合
alien_0 ={'color':'green','number':5}
print(alien_0['color'])
print(alien_0['number'])

alien_0 ={'color':'green','number':5}
alien_0['first_name'] = 'mo'
alien_0['last_name'] = 'ak'
print(alien_0)

#访问元素
favorite_languages ={
  'jen':'python',
  'sarah':'c',
  'edwoad':'ruby',
  'phil':'python',
}
print(favorite_languages['jen'])
#删除键值对
del favorite_languages['phil']
print(favorite_languages)

favorite_numbers = {
  'mx' : '6',
  'cg' : '365',
  'zxp': '8',
}
for key,value in favorite_numbers.items():
  print("\nkey:"+key)
  print("value:"+value)

favorite_numbers = {
  'mx' : '6',
  'cg' : '365',
  'zxp': '8',
}
for name in favorite_numbers.keys():
  print(name.title())

#字典列表：
alien_0 = {'color':'green','points':5}
alien_1 = {'color':'red','points':6}
alien_2 = {'color':'blue','points':3}
aliens = [alien_0,alien_1,alien_2]
for alien in aliens:
  print(alien)
#字典中存储列表：
favorite_language ={
  'jen':['python','c'],
  'mx':['java','python'],
}
for name,languages in favorite_language.items():
  print("\n\t"+name+str(languages))
  for language in languages:
    print(language)