python文件的读写

#文件的读写模式，r w x a b t +
def read_file():
text = 'test.text'
with open(text,encoding='utf-8') as r:#自动关闭文件，可以使用完全路径
rest = r.read()#将对象读取成为文件
readline只读一行
readlines读取所有行 以列表形式出现
print(rest)
if name=='main':
read_file()

#文件的写入def write_file():#逐个写入    file_name = 'test1'    f = open(file_name,'w')#以写入的方式打开文件    f.write('hello')    f.write('\n')    f.write('world')def write_mult_line():#一次性写入    file_name = 'write_mult_line.txt'    with open(file_name,'w',encoding='utf-8') as f:        l = ['1','2','3']        f.writelines(l)def write_user_log():#随机记录时间和用户并且逐行写入    rest = '用户：{0} - 访问时间{1}'.format(random.randint(1000,9999), datetime.now())    print(rest)    file_name = 'write_user_log.txt'    with open(file_name,'a',encoding='utf-8') as f:        f.write(rest)        f.write('\n')def read_and_write():#先读再写入  判断是否有某个字符串    file_name = 'read_and_write'  #这个需要先建立文件夹    with open(file_name,'r+',encoding='utf-8') as f:        read_rest = f.read()        if '1' in read_rest:            f.write('kkkkkkkk')        else:            f.write('aaaa')        f.write('\n')if __name__ == '__main__':    read_and_write()