info = {‘name‘: ‘班长‘, ‘id‘: 88, ‘sex‘: ‘man‘, ‘address‘: ‘地球亚洲中国北京‘}

print(info[‘name‘])
print(info[‘address‘])

# 若访问不存在的键，则会报错
# print(info[‘age‘])
# 不确定字典中是否存在某个键而又想获取其值时，使用get方法，还可以设置默认值
print(info.get(‘age‘,22))

info = {‘name‘: ‘班长‘, ‘id‘: 100, ‘sex‘: ‘f‘, ‘address‘: ‘地球亚洲中国北京‘}
info[‘id‘] = int(150301016)
print(‘修改之后的id为:%d‘ % info[‘id‘])

info = {‘name‘: ‘班长‘, ‘sex‘: ‘f‘, ‘address‘: ‘地球亚洲中国北京‘}
info[‘id‘] = int(150301016)
print(‘添加之后的id为:%d‘ % info[‘id‘])

# 删除指定的元素
info = {‘name‘: ‘班长‘, ‘sex‘: ‘f‘, ‘address‘: ‘地球亚洲中国北京‘}
del info[‘name‘]
info.get("name")

# 删除整个字典
info = {‘name‘: ‘monitor‘, ‘sex‘: ‘f‘, ‘address‘: ‘China‘}
del info
print(info)
# NameError: name ‘info‘ is not defined

# 清空整个字典
info = {‘name‘: ‘monitor‘, ‘sex‘: ‘f‘, ‘address‘: ‘China‘}
info.clear()
print(info)
# {}

info = {‘name‘: ‘monitor‘, ‘sex‘: ‘f‘, ‘address‘: ‘China‘}

# 键值对的个数
print(len(info))
# 3

# 返回一个包含字典所有KEY的列表
print(info.keys())
# dict_keys([‘name‘, ‘sex‘, ‘address‘])

# 返回一个包含字典所有value的列表
print(info.values())
# dict_values([‘monitor‘, ‘f‘, ‘China‘])

# 返回一个包含所有（键，值）元组的列表
print(info.items())
# dict_items([(‘name‘, ‘monitor‘), (‘sex‘, ‘f‘), (‘address‘, ‘China‘)])

# 如果key在字典中，返回True，否则返回False
print("x" in info)
# False

info = {‘name‘: ‘monitor‘, ‘sex‘: ‘f‘, ‘address‘: ‘China‘}

# 遍历字典的key
for key in info.keys():
    print(key, end=" ")
# name sex address

# 遍历字典的value
for val in info.values():
    print(val, end=" ")
# monitor f China

# 遍历字典的元素
for item in info.items():
    print(item, end=" ")
# (‘name‘, ‘monitor‘) (‘sex‘, ‘f‘) (‘address‘, ‘China‘)

# 遍历字典的key-value
for key, val in info.items():
    print("k=%s,v=%s" % (key, val), end=" ")
# k=name,v=monitor k=sex,v=f k=address,v=China

# 带下标索引的遍历
chars = [‘a‘, ‘b‘, ‘c‘, ‘d‘]

i = 0
for chr in chars:
    print("%d %s" % (i, chr))
    i += 1

for i, chr in enumerate(chars):
    print(i, chr)


# 字符串遍历
a_str = "hello swt"
for char in a_str:
    print(char, end=‘ ‘)
# h e l l o   s w t

# 列表遍历
a_list = [1, 2, 3, 4, 5]
for num in a_list:
    print(num, end=‘ ‘)
# 1 2 3 4 5

# 元组遍历
a_turple = (1, 2, 3, 4, 5)
for num in a_turple:
    print(num, end=" ")
# 1 2 3 4 5