#!/usr/bin/env python  
# encoding: utf-8


from datetime import datetime
from mongoengine import connect, Document, StringField, IntField, FloatField, ListField, DateTimeField, \
    EmbeddedDocument, EmbeddedDocumentField
connect('students', host='localhost', port=27017)

SEX_CHOICES = (
    ('male', '男'
 
),
    ('female', '女')
)


class Grade(EmbeddedDocument):
    """ 成績 """
    subject = StringField(required=True)
    score = FloatField(required=True)


class Student(Document):
    """ 學生 """
    meta = {
        'collection': 'students',   #定義集合名稱
    }

    name = StringField(max_length=32, required=True
 
)    # max_length最大長度，required=True 不能不填寫
    age = IntField(required=True)
    grade = FloatField()
    address = StringField()
    sex = StringField(choices=SEX_CHOICES, required=True)   # choices 只能根據定義的SEX_CHOICES選擇
    grades = ListField(EmbeddedDocumentField(Grade))
    created_at = DateTimeField(default=datetime.now())


class
 
 TestMongoEngine(object):
    # 新增資料
    def add_one(self):
        yuwen = Grade(
            subject="語文",
            score=83
        )
        english = Grade(
            subject="英語",
            score=92
        )
        mathematics = Grade(
            subject="數學",
            score=95
        )
        stu_obj = Student(
            name="李1",
            age=21,
            address="ShangHai",
            sex='female',
            grades=[yuwen, english, mathematics]
        )
        # stu_obj.remark = "remark"
        stu_obj.save()
        return stu_obj

    # 獲取一條資料
    def get_one(self):
        return Student.objects.first({})

    # 獲取多條資料
    def get_More(self):
        return Student.objects.all()

    # 獲取一條帶條件資料，根據id獲取，id=pk
    def get_from_oid(self, oid):
        return Student.objects.filter(pk=oid).first()

    # 修改資料
    def update(self):
        """將所有男生年齡增加2"""
        return Student.objects.filter(sex='male').update(inc__age=2)
        # 返回結果為修改行數,inc__ 參考文件：http://docs.mongoengine.org/guide/querying.html?highlight=inc__

    # 刪除資料
    def delete(self):
        """刪除資料"""
        return Student.objects.filter(sex='female',name='李1').delete()  # 返回結果為刪除行數


def main():
    obj = TestMongoEngine()
    #新增資料
    # rest = obj.add_one()
    # print(rest.name)

    # 獲取一條資料
    # rest = obj.get_one()
    # print(rest.grades[0].score)

    # 獲取多條資料
    # rest = obj.get_More()
    # print(type(rest), rest[0].name)

    # 獲取一條帶條件資料
    # rest = obj.get_from_oid('5b10f316485e2e4a9416090e')
    # print(rest.name)

    # 修改資料
    # rest = obj.update()
    # print(rest)

    # 刪除資料
    # rest = obj.delete()
    # print(rest)


if __name__ == '__main__':
    main()

當新增文件如：

# stu_obj.remark = "remark"

在class Student中沒有定義，新增時則remark無法新增，
這時可以修改class Student的定義：

class Student(DynamicDocument):
    ......
    ......