Question

c.execute("SELECT Date, BehaviourType, BehaviourDescription "+
          "FROM Student "+
          "WHERE Forename = :forename "+
            "AND Surname = surname "+
            "AND YearGroup = :yeargroup "+
            "AND FormNumber = :formnumber "+
            "AND Date BETWEEN :startdate AND :enddate",
          {"forename": forename,
           "surname": surname,
           "yeargroup": yeargroup,
           "formnumber": formnumber,
           "startdate": startdate,
           "enddate": enddate})

        studentRequest = c.fetchall()
        record = str(studentRequest)

    #write to file
        f = open('Student Report', 'w')
        f.write('Name: ' + name)
        f.write(' Form Number: ' + (yeargroup +'/'+ formnumber))
        for records in record:
            record.replace("u'", " ")
            record.replace("'", " ")
            record.replace("(", " ")
            record.replace(")", " ")
            f.write(str(records))
        f.close()

replace（）方法似乎不起作用，但程序正在运行。

Answer 1

您有两个问题：

在for循环中，您正在replace而不是record上应用records功能。
replace函数返回一个新字符串，每次调用它时都会“扔掉”。

两者的解决方案是将record.replace(...)更改为records = records.replace(...)。

BTW，为了更好的可读性，我会将record重命名为records，反之亦然......

<强>更新

我相信，record = str(studentRequest)会有更基本的问题。

您应该如何做到这一点：

studentRequests = c.fetchall()

for studentRequest in studentRequests:
    record = str(studentRequest)
    record = record.replace("u'"," ")
    record = record.replace("'" ," ")
    record = record.replace("(" ," ")
    record = record.replace(")" ," ")
    f.write(record+"\n") # or "\r\n" if your program is running on Unix

尝试通过删除某些字符串来格式化从sqlite3数据库中检索的数据。我的代码出了什么问题？

1 个答案: