Python 文件基本操作

# -*- coding:utf-8 -*-import os'''open函数open(name,mode)-name 文件名-mode 访问模式   r 读方式   w 写方式   a 以追加模式打开（必要时创建新文件）   r+,w+,a+ 读写模式'''#文件属性try:wf0 = open('file.txt')print wf0.encoding #文件编码方式print wf0.mode #访问模式print wf0.name #文件名print wf0.closed #是否关闭finally:wf0.close()#读取所有try:f0 = open('file.txt','r')txt0 = f0.read()print txt0finally:f0.close()#按长度读取try:f1 = open('file.txt')while True:tmp = f1.read(6)if not tmp:breakprint tmpfinally:f1.close()#逐行读取2print '------------------------------'try:f1 = open('file.txt');for line in f1.readlines():print line;except Exception, e:print e;finally:if f1:f1.close();print '------------------------------'#逐行读取1try:f2 = open('file.txt')while True:txt2 = f2.readline()if not txt2:breakprint "%d:%s" % (len(txt2),txt2)finally:f2.close()#写入内容try:wf0 = open('file.txt','a')wf0.write('append')finally:wf0.close()#写入多行内容strs = ['1','2\n','3']try:wf0 = open('file.txt','a')wf0.writelines(strs)finally:wf0.close()