python读取文本、配对、插入数据脚本

#在工作中遇见了一个处理数据的问题，纠结了很久，写下记录一下。
#-*- coding:UTF-8 -*-
#-*- author:ytxu -*-
 
import codecs, os, sys, platform, string
 
def env():
    return platform.system()
 
def read_file(uri, charset = "utf-8"):
    f = codecs.open(uri, "r", charset)
    s = f.read()
    f.close()
    return s
 
def write_file(uri, content = u"", charset = "utf-8"):
    f = codecs.open(uri, "w", charset)
    f.write(content)
    f.close()
 
def parse(f, osep, ls):
    ctx = read_file(f)
    r = []
    for l in ctx.split(osep):
        tl = []
        for c in l.split(ls):
            c = c.strip()
            len(c) > 0 and tl.append(c)
            r.append(tuple(tl))
    return r
 
def parse_log(f, osep, ls):
    ctx = read_file(f)
    r = []
    for l in ctx.split(osep):
        tl = []
        for c in l.split(ls):
        c = c.strip()
        tl.append(c)
        r.append(tuple(tl))
    return r
 
def found_t(ts, n):
    for t in ts:
    if t[0].rfind(n) != -1:
    return t
 
def found_id(us, n):
    for u in us:
        if (len(u) < 2): 
            break
        if (u[1].rfind(n) != -1) or (u[2].rfind(n) != -1) or (u[3].rfind(n) != -1):
            return u[0]
    return None
 
if __name__ == '__main__':
    env() == "Windows" and os.system("cls")
 
rst = []
us = parse_log("./user.txt", '
', '	')
ts = parse("./teacher.txt", '
', ' ')
for s in parse("./student.txt", '
', ' '):
    t = found_t(ts, s[5])
    if t is None: 
    print s[5]
    continue
 
sid = found_id(us, s[4])
tid = found_id(us, t[2])
if sid is not None and tid is not None:
q = u"INSERT into student_teacher_relation(student_id,teacher_id,subject) values (%d,%d,'%s')" %(int(sid),int(tid),t[1])
# print sid, tid, q
rst.append(q)
# print u"学生帐号：", s[4], u"学生名称：", s[0], u"代课老师：", t[0], u"代课老师的帐号：", t[2]
 
write_file("./insert.sql", string.join(rst, "
"))