Question

正如标题所说，我正在使用Python制作数据库系统（非常非常早期的开发阶段，所以请不要对它进行评判）并且我对文件i / o有一些问题。更具体地说，我打开和写入的文件将不会被代码创建，即使我手动创建文件也不会写入它...基本上文件i / o函数什么也不做，并且不是返回任何错误！

pydb.py

=23

testing.py

import os

class schema:
    __tableName = ""
    __colCnt = 0
    __columns = []

    # This constructor DOES NOT make the columns it simple set some of the schema variables
    def __init__(self, tableName, colCnt):
        self.__tableName = tableName
        self.__colCnt = colCnt

        # Considering we didn't make the columns in this function we will redirect to the method to do so
        self.__createCols()

    # This function actually cycles through each column expecting a name for it
    def __createCols(self):
        for i in range(0, self.__colCnt):
            self.__columns.append(None)
            self.__columns[i] = input("Column #{0}: ".format(i))

        # Checking for schema structures' folders and creating empty schema file
        if os.path.exists("/schema/"):
            os.chdir("/schema/")
            open(self.__tableName + ".schema", "a").close()
        else:
            os.mkdir("/schema/")
            os.chdir("/schema/")
            open(self.__tableName + ".schema", "a").close()

        # Writes to schema file that was just created
        os.chdir("/schema/")
        f = open(self.__tableName + ".schema", "w+")

        f.write("{0}:schema[{1}] = (".format(self.__tableName, self.__colCnt))

        for i in range(0, self.__colCnt):
            f.write(self.__columns[i] + ", ")

        f.close()

        # Some responses and concern messages after schema file has been created successfully
        print("All columns successfully created!")
        print("[this is simply a temporary layout for a table not an actual table] Please bake this schema for use.")

Python文件I / O不工作

0 个答案: