python的mysql小代码

我因为懒，就想写个批量insert数据的小代码 这里是代码

# _*_ encoding:utf-8 _*_
import os
import MySQLdb
import numpy as np

dbname = 'spj'
db = MySQLdb.connect(host="localhost", port=3306, user="root", passwd="", db=dbname,charset="utf8")  # 进行插入操作时需要声明编码类型
cursor = db.cursor()

def dp_insert(file_name,putin):
    file = open(file_name, "r")
    for line in file.readlines():#插入
        arr = line.split()
        sql = putin+' values '+'('+"'"+arr[0]+"'"+','+"'"+arr[1]+"'"+','+"'"+arr[2]+"'"+','+"'"+arr[3]+"'"')'+';'
        try:
            cursor.execute(sql)
            db.commit()
        except:
            print("Error")
    file.close()

def select(putin):
    sql = putin
    try:
        cursor.execute(sql)
        results = cursor.fetchall()
        for row in results:
            print(row)
        db.commit()
    except:
        print("Error: unable to fecth data")

def describe(putin):
    sql = putin
    try:
        cursor.execute(sql)
        results = cursor.fetchall()
        for row in results:
            print(row)
        db.commit()
    except:
        print("Error: unable to fecth data")

def delete_line(infile,outfile):
    infopen = open(infile,'r')
    outfopen = open(outfile,'w')
    lines = infopen.readlines()
    for line in lines:
        if line.split():
            outfopen.writelines(line)
        else:
            outfopen.writelines("")
    infopen.close()
    outfopen.close()
    os.remove(infile)
    os.rename(outfile,infile)

def main():
    file_name = 'p.txt'
    print("please input sql:")
    putin = input()
    delete_line(file_name, 'new.txt')  # test pass
    if putin.startswith('insert'):  # +','+"'"+arr[2]+"'"
        print("数据的path")
        file_name = input()
        dp_insert(file_name, putin)
    elif putin.startswith('select'):
        select(putin)
    elif putin.startswith('describe'):
        describe(putin)
    else:
        db.close()
        os._exit()

if __name__ == '__main__':
    main()
    print("next?")
    if input()=='Y':
        main()
    else:
        db.close()
        os._exit()
    db.close()

    #insert 模板
    #insert into p(pno, sname, color, weight)

（insert语句：insert into j(jno,jname,city)）

这里是一些文件处理的代码，之前放在代码里，看着难受,放在这里

# 读取path目录下的文件名，返回文件名list列表
def readFileName(path):
 lists = []
 for root, dirs, files in os.walk(path):
 for file in files:
 lists.append(os.path.join(root, file))
 return lists

# 删除路径为filepath的文件
def delFile(filepath):
 os.remove(filepath)
 print
 "ok"
'''

'''
#转化为数组
for line in open("p.txt","r"):
 arr =line.split()
 print(arr)

#转化为列表
file = open("p.txt", "r")
list_arr = file.readlines()
for i in range(len(list_arr)):
 list_arr[i] = list_arr[i].strip()
a = np.array(list_arr)
print(a)
file.close()
'''
#sql=''+''+''+'' 加号连接 sql=‘%s%s%s’ % ('','','')