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Python数据持久化-小测验

Python数据持久化-小测验

作者: 潇洒坤 | 来源:发表于2018-07-13 15:19 被阅读105次

    2018年7月13日考试

    1.Python读写csv文件

    现有如下图1所示的data.csv文件数据,请使用python读取该csv文件数据,并添加一条记录后输出如图2所示的output.csv文件(10分)

    题1.png
    这一题需要用到的csv文件data.csv下载链接: https://pan.baidu.com/s/1JCUCU4vXBQNwOx2xhAjDqA 密码: pbpx
    第1题
    import csv 
    
    def printCsv(csvName):
        with open(csvName) as csvFile:
            reader = csv.reader(csvFile)
            for i in reader:
                print(i)
    
    if __name__ == "__main__":
        inCsv = "data.csv"
        outCsv = "output.csv"
        with open(inCsv) as csvFile:
            reader = csv.reader(csvFile)
            data = list(reader)
        print("原csv文件data.csv的数据内容:")
        printCsv(inCsv)
        data.append(['Jack','104'])
        with open(outCsv,'w',\
            newline='') as csvFile:
            writer = csv.writer(csvFile)
            writer.writerows(data)
        print("新产生的csv文件output.csv的数据内容:")
        printCsv(outCsv)
    

    上面一段代码的运行结果如下:

    原csv文件data.csv的数据内容:
    ['name', ' stuNo']
    ['ZhangSan', ' 101']
    ['LiSi', ' 102']
    ['WangWu', ' 103']
    新产生的csv文件output.csv的数据内容:
    ['name', ' stuNo']
    ['ZhangSan', ' 101']
    ['LiSi', ' 102']
    ['WangWu', ' 103']
    ['Jack', '104']

    2.Python读写excel文件

    如下所示的Excel表格数据,请编写python代码筛选出Points大于5的数据,并按Points进行排序后输出如图2所示的Excel文件结果

    题2.png
    这一题需要用到的excel文件rank.xlsx下载链接: https://pan.baidu.com/s/1reS7yjxUjU1iqZc0rCjljA 密码: uymy
    import xlrd
    import xlwt
    
    if __name__ == "__main__":
        excel = xlrd.open_workbook("rank.xlsx")
        sheet = excel.sheet_by_index(0)
        #获取字段列表赋值给field_list,第2个字段大于5的数据列表赋值给data_list
        field_list = sheet.row_values(0)
        data_list = []
        for i in range(1,sheet.nrows):
            if int(sheet.row_values(i)[2]) > 5:
                data_list.append(sheet.row_values(i))
        #利用sorted内置函数排序
        data_list = sorted(data_list,key=lambda x:x[2],reverse=True)
        #将获得的信息存入新表,命名为output.xlsx
        excel_w = xlwt.Workbook()
        sheet_w = excel_w.add_sheet("sheet1")
        for i in range(len(field_list)):
            sheet_w.write(0,i,field_list[i])
        for i in range(len(data_list)):
            for j in range(len(data_list[i])):
                sheet_w.write(i+1,j,data_list[i][j])
        excel_w.save("output.xls")
    

    3.mysql数据库的sql语句

    (1) 使用sql创建出如下图所示的数据表,数据库名为movies,表名为movieRank,表中包含MovieName、boxOffice、percent、days、totalBoxOffice五个字段,字段的信息如下图所示:


    题3-1.png
    创建语句.png

    (2)使用sql语句向movieRank表中添加若干条数据(材料中已提供movieData.txt)

    insert into movierank values("21克拉", 1031.92, 15.18, 2, 2827.06);
    insert into movierank values("狂暴巨兽", 2928.28, 43.07, 9, 57089.20);
    insert into movierank values("起跑线", 161.03, 2.37, 18, 19873.43);
    insert into movierank values("头号玩家", 1054.87, 15.52, 23, 127306.41);
    insert into movierank values("红海行动", 45.49, 0.67, 65, 364107.74);

    插入数据的结果如下图所示:


    插入结果图示.png

    (3)使用sql语句查询movieRank表中的数据并按照totalBoxOffice字段进行排序

    select * from movierank order by totalboxoffice;

    (4)使用sql语句计算出字段totalBoxOffice字段的总和

    select sum(totalboxoffice) from movierank;

    4.Python操作mysql数据库

    此题接第3题题干,在第三题的基础上完成以下需求:
    (1)编写python代码连接mysql数据库,并向movieRank表中新添加两条数据(已提供second.txt)

    import pymysql
    
    def getConn(database ="pydb"):
        args = dict(
            host = 'localhost',
            user = 'root',
            passwd = 'Leimysql8',
            charset = 'utf8',
            db = database
        )
        return pymysql.connect(**args)
    
    if __name__ == "__main__":
        conn = getConn("movies")
        cursor = conn.cursor()
        insert_sql = 'insert into movierank values'\
        '("犬之岛", 617.35, 9.08, 2, 1309.09),'\
        '("湮灭", 135.34, 1.99, 9 , 5556.77)'
        cursor.execute(insert_sql)
        conn.commit()
        conn.close()
    

    (2)编写python代码,查询出所有的电影数据,并输出到一个Excel表movieRank.xlsx中,如下图所示


    题4-2.png
    import pymysql
    import xlwt
    
    def getConn(database ="pydb"):
        args = dict(
            host = 'localhost',
            user = 'root',
            passwd = 'Leimysql8',
            charset = 'utf8',
            db = database
        )
        return pymysql.connect(**args)
    
    if __name__ == "__main__":
        #从mysql数据库中取出数据赋值给data_list,其数据类型为元组
        conn = getConn("movies")
        cursor = conn.cursor()
        select_sql = "select * from movierank "
        cursor.execute(select_sql)
        data_list = cursor.fetchall()
        field_list = [k[0] for k in cursor.description]
        #把data_list中的数据存入新的excel中,并命名为movieRank.xls
        excel = xlwt.Workbook()
        sheet = excel.add_sheet("sheet1")
        for i in range(len(field_list)):
            sheet.write(0,i,field_list[i])
        for i in range(len(data_list)):
            for j in range(len(data_list[i])):
                sheet.write(i+1,j,data_list[i][j])
        excel.save("movieRank.xls")
    

    5.Python操作MongoDB数据库

    (1)编写python代码连接MongoDB数据库,并新建一个building库,在building库下新建一个rooms表

    from pymongo import MongoClient
    
    if __name__ == "__main__":
        conn = MongoClient("localhost")
        db = conn.building
        rooms = db.create_collection("rooms")
    

    (2)编写python代码读取rooms.csv文件的中的数据,并将数据插入到rooms表中,添加到rooms表中的数据结构如下图所示

    image.png
    这一题需要用到的csv文件rooms.csv下载链接: https://pan.baidu.com/s/10fyct-J3a0txtS-EZaaxAQ 密码: je33
    from pymongo import MongoClient
    import csv
    
    if __name__ == "__main__":
        with open("rooms.csv") as csvFile:
            reader = list(csv.reader(csvFile))
            field_list = reader[0]
            data_list = reader[1:]
        conn = MongoClient("localhost")
        db = conn.building
        rooms = db.rooms
        insert_list = []
        for data in data_list:
            insert_list.append(
                {key:value for key,value in zip(field_list,data)})
        rooms.insert_many(insert_list)
    

    使用csv.DictReader方法

    from pymongo import MongoClient
    import csv
    
    if __name__ == "__main__":
        conn = MongoClient("localhost")
        db = conn.building
        rooms = db.rooms
        with open("rooms.csv") as csvFile:
            reader = csv.DictReader(csvFile)
            for row in reader:
                rooms.insert_one(dict(row))
    

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