python 选修课学业所迫

1. python 连接mysql

import pymysql
conn = pymysql.connect(host='', port=, user='', password='', database='')
curs = conn.cursor()
def select():
    sql = "select * from "
    try:
        curs.execute(sql)  # 执行sql语句
        res = curs.fetchall()  # 获取查询的所有记录
        for row in res:
            print(row)
    except Exception as e:
        raise e
def insert(sno1, sname1, sex1, birthday1, maths1, english1, os1):
    data = { 
        'sno': sno1,
        'sname': sname1,
        'sex': sex1,
        "birthday": birthday1,
        "maths": maths1,
        "english": english1,
        "os": os1,
    }
    table = 'tb_grade'
    keys = ', '.join(data.keys())
    values = ', '.join(['%s'] * len(data))
    sql = 'INSERT INTO {table}({keys}) VALUES ({values})'.format(table=table, keys=keys, values=values)
    try:
        curs.execute(sql, tuple(data.values()))
        print('Successful')
        conn.commit()
    except:
        print('Failed')
        conn.rollback()
def delete(sno):
    sql = "DELETE FROM tb_grade WHERE sno = " + sno
    try:
        curs.execute(sql)
        conn.commit()
    except:
        conn.rollback()  # 发生错误时回滚
def updategrade(sno, maths, english, os):
    sql = "UPDATE tb_grade SET maths =" + maths + ",english=" + english + ",os=" + os + " WHERE sno=" + sno
    try:
        curs.execute(sql)
        conn.commit()
    except:
        conn.rollback()  # 发生错误时回滚
while 1:
    s = input("请输入需要操作的命令：\n"
              "1、修改数据\n"
              "2、查询数据\n"
              "3、插入数据\n"
              "4、删除数据\n")
    if s == "1":
        print("您选择修改数据")
        sno = input("请输入要修改的学生学号：")
        maths = input("请输入数学成绩：")
        english = input("请输入英语成绩：")
        os = input("请输入操作系统成绩：")
        updategrade(sno, maths, english, os)
        print("修改结果如下")
        select()
    elif s == "2":
        print("您选择查询数据")
        select()
    elif s == "3":
        print("您选择插入数据")
        sno = input("请输入的学生学号：")
        sname = input("请输入的学生姓名：")
        sex = input("请输入的学生性别：")
        birthday = input("请输入的学生生日：")
        maths = input("请输入数学成绩：")
        english = input("请输入英语成绩：")
        os = input("请输入操作系统成绩：")
        insert(sno, sname, sex, birthday, maths, english, os)
        print("插入结果如下")
        select()
    elif s == "4":
        sno = input("请输入的要删除的学生学号：")
        delete(sno)
        print("删除结果如下")
        select()
    else:
        conn.close()
        break

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2. python mondodb

import datetime
import pymongo
client = pymongo.MongoClient(host='localhost', port=27017)
db = client.manager  # 数据库
emp = db.tb_emp  # 表
profession = db.tb_profession
dept = db.tb_dept
# tb_emp = {"eid": 2, "name": "lisi", "sex": "男",
# "birthday": "2017-7-6", "intro": "i m lisi", "profession": 2, "dept": 2}
# tb_profession = { 
# "id": 1,
# "name": "计算机",
# }
# tb_profession = { 
# "id": 2,
# "name": "软工",
# }
# tb_dept = { 
# "id": 1,
# "name": "科学部",
# }
# tb_dept = { 
# "id": 2,
# "name": "活动部",
# }
# one_insert = emp.insert_one(document=tb_emp)
# one_insert = profession.insert_one(document=tb_profession)
# one_insert = dept.insert_one(document=tb_dept)
# one_result = emp.find_one({"eid": 1})
# find = emp.find()
# for result in find:
# print(result)
# print(one_result["sex"])
# print(one_result)
def selectAll():
    find = emp.find()
    for result in find:
        profession_find_one = profession.find_one({ "id": result["profession"]})
        dept_find_one = dept.find_one({ "id": result["dept"]})
        result["profession"] = profession_find_one["name"]
        result["dept"] = dept_find_one["name"]
        print(result)
def selectone(name):
    one_result = emp.find_one({ "name": name})
    profession_find_one = profession.find_one({ "id": one_result["profession"]})
    dept_find_one = dept.find_one({ "id": one_result["dept"]})
    one_result["profession"] = profession_find_one["name"]
    one_result["dept"] = dept_find_one["name"]
    print(one_result)
def delete(eid):
    // delete_one()也可
    remove = emp.remove({ "eid": eid})
    print(remove)
def insert(eid, name, sex, birthday, intro, professionname, deptName):
    one_result_profession = profession.find_one({ "name": professionname})
    if one_result_profession is None:
        print("该专业不存在")
        return
    profession_id = one_result_profession["id"]
    one_result_dept = dept.find_one({ "name": deptName})
    if one_result_dept is None:
        print("该部门不存在")
        return
    dept_id = one_result_dept["id"]
    tb_emp = { "eid": eid, "name": name, "sex": sex,
              "birthday": birthday, "intro": intro, "profession": profession_id, "dept": dept_id}
    one_insert = emp.insert_one(document=tb_emp)
    print(one_insert, "插入成功！")
def update(eid, updateemp):
    conditon = { "eid": eid}
    one = emp.find_one({ "eid": eid})
    print(one)
    for i in updateemp.keys():
        one[i] = updateemp[i]
    print(one)
    result = emp.update(conditon, one)
    print(result)

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查找所有：
selectAll():

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根据名字查找：
selectone(“zhansan”)

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插入：
insert(3,“wangwu”,“女”,“2018-9-8”,“i m wangwu”,“计算机”,“科学部”)
selectAll()

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update(1, {“name”: “lyq”})
selectAll()

insert(4,“待删除”,“女”,“2018-9-8”,“i m wangwu”,“计算机”,“科学部”)
selectAll()
delete(4)
selectAll()

3. python处理异常（自定义异常）

外加一个

class List_Queue:
    def __init__(self):
        self.items = []
    def enqueue(self, item):
        self.items.append(item)
    def dequeue(self):
        return self.items.pop(0)
    def empty(self):
        return self.size() == 0
    def size(self):
        return len(self.items)
    def remove(self, index):
        if self.size() == 0:
            raise List_Queue_Exception(index, "数组为空,无法移除")
        elif self.size() < index:
            raise List_Queue_Exception(index, "数组越界")
        count = 0
        for i in self.items:
            if count == index:
                return self.items.remove(self.items[index])
            count = count + 1
        return self.items
class List_Queue_Exception(BaseException):
    def __init__(self, index, type):
        self.message = "当前index" + str(index) + ": " + type
    def getMessage(self):
        return self.message
from homework4.List_queue import List_Queue_Exception, List_Queue
if __name__ == '__main__':
    queue = List_Queue()
    try:
        queue.enqueue("123")
        queue.enqueue("122")
        queue.enqueue("121")
        print(queue.size())
        print(queue.items)
        queue.remove(1)
        print(queue.size())
        print(queue.items)
    except List_Queue_Exception as e:
        print(e.getMessage())
出现异常：
 queue.remove(5)