python之字典【dict】

#Auther Duncan
#--*--coding=utf-8--*--

# name1 = ‘zidane‘
# name2 = "zidane"
# print(type(name1),type(name2))


# username = raw_input("Input your name:")
# if username.strip() == "root":
#     print("welcome to login")
# else:
#     print("Invalid username")

# name = ‘hello,world‘
# print("h" in name)
# print(‘,‘ in name)
# print(‘a‘ in name)


# name = ‘root‘
# print(name.capitalize())


# name = ‘administrator‘
# print(name[0:1])
# print(name[2:9])


# name = ‘administrator‘
# print(name.center(40,‘-‘))

# name = ‘administrator‘
# print(name.find("a"))
# print(name.find("b"))


# age = raw_input("input age")

#
# age = ‘adddddddddddddddd‘
# age = age.replace(‘d‘,‘D‘)
# print(age)

# print(ord(‘s‘))
# print(chr(116))

# dict = {‘name‘:‘Bob‘,‘age‘:17,‘job‘:‘IT‘}
# print(type(dict))

# dict.clear()
# print(dict)

# dict1 = dict.copy()
# print(dict1)

# print(dict.get(‘name‘))
# print(dict.get(‘NAME‘))


# print(dict.has_key(‘name‘))
# print(dict.has_key(‘NAME‘))


# print(dict.items())

# print(dict.iterkeys())

# print(dict.values())
#
# print(dict.keys())

# del dict[‘name‘]
# print(dict)


# print(dict.pop("name"))

# print(dict.pop(‘age‘))
# print(dict.pop(‘agE‘))


# print(dict.popitem())
# print(dict)
# print(dict.popitem())
# print(dict)
# print(dict.popitem())
# print(dict)

# dict.setdefault(‘name‘,‘shenzhen‘)
# print(dict)
#
# 如果是一个已经存在的键，不会修改已有的键值
# {‘job‘: ‘IT‘, ‘age‘: 17, ‘name‘: ‘Bob‘}

# dict.setdefault(‘add‘,‘shenzhen‘)
# print(dict)
#
# #如果是一个不存在的键值，则会添加到dict中
# {‘job‘: ‘IT‘, ‘age‘: 17, ‘add‘: ‘shenzhen‘, ‘name‘: ‘Bob‘}

# list = ["name","age","job"]
# dict1 = dict.fromkeys(list)
# print(dict1)

#结果，把一个列表中的元素当做新的dict的键值，value是可选的，如果不写，则默认是None
# {‘job‘: None, ‘age‘: None, ‘name‘: None}
#
#
# tuple = ("name","age","job")
# print(type(tuple))
# dict2 = dict.fromkeys(tuple,‘abc‘)
# print(dict2)
#
# 结果，结果，把一个元组中的元素当做新的dict的键值，value是可选的，如果写，则只能写一个value的值
# {‘job‘: ‘abc‘, ‘age‘: ‘abc‘, ‘name‘: ‘abc‘}

# 查看k值和v值
# print(dict.viewitems())
# 查看k值
# print(dict.viewkeys())
# 查看v值
# print(dict.viewvalues())


# dict1 = {‘name‘:‘Bob‘,‘age‘:17,‘job‘:‘IT‘}
# dict2 = {‘name‘:‘Cui‘,‘age‘:19,‘job‘:‘teacher‘}
# dict1.update(dict2)
# print(dict1)
#
# #结果，把dict2中的k值和v值update到dict1中，如果有重复的键值，会被更新
# {‘job‘: ‘teacher‘, ‘name‘: ‘Wang‘, ‘age‘: 19}

# dict1 = {‘name‘:‘Bob‘,‘age‘:17,‘job‘:‘IT‘}
# dict3 = {‘add‘:‘shenzhen‘}
# dict1.update(dict3)
# print(dict1)
#
# #结果，把dict3中的k和v值更新到dict1中，如果dict3中的k值在不dict1中不存在，则会追加到dict1中
# {‘job‘: ‘IT‘, ‘age‘: 17, ‘add‘: ‘shenzhen‘, ‘name‘: ‘Bob‘}

python之字典【dict】

原文：http://www.cnblogs.com/bainianminguo/p/6412978.html