习题16 读写文件

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首先给出原始的程序

from sys import argvscript ,filename = argvprint "We're going to erase %r."% filenameprint "If you don't want that ,hit CTRL-C (^C)."print "If you do want that ,hit RETURN."raw_input("?")print "Opening the file..."target = open(filename, 'w')print "Truncating the file. Goodbye!"target.truncate()print "Now I'm going to ask you for three lines."line1 = raw_input("line 1: ")line2 = raw_input("line 2: ")line3 = raw_input("line 3: ")print "I'm going to write these to the file."target.write(line1)target.write("\n")target.write(line2)target.write("\n")target.write(line3)target.write("\n")print "And finally ,we close it."target.close()


这段程序就是用来写 test.txt 的,如果多次运行,由于存在 truncate命令,会擦掉以前写的东西

还有打开文件写完以后记得关闭文件

target.close()



运行结果如下



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附加练习

1

#-*-coding:utf-8-*-from sys import argv #不解释script ,filename = argvprint "We're going to erase %r."% filename #刚刚输入的文件名print "If you don't want that ,hit CTRL-C (^C)."print "If you do want that ,hit RETURN."# 这两句话没看懂,好像想要你判断但是实际上并没有判断语句raw_input("?")# 并没有什么卵用,纯粹是为了停顿print "Opening the file..."target = open(filename, 'w') # 这里的 w 其实是以 写模式 打开文件print "Truncating the file. Goodbye!"target.truncate()# 清空目标文件保存的内容print "Now I'm going to ask you for three lines."line1 = raw_input("line 1: ")#输入三行字line2 = raw_input("line 2: ")line3 = raw_input("line 3: ")print "I'm going to write these to the file."target.write(line1)#写入target.write("\n")target.write(line2)target.write("\n")target.write(line3)target.write("\n")print "And finally ,we close it."target.close()#一定记得关闭文件

2.

写一个读取刚刚的test.txt 文件

其实和以前一样


3.花了好多时间

#-*-coding:utf-8-*-from sys import argv #不解释script ,filename = argvprint "We're going to erase %r."% filename #刚刚输入的文件名print "If you don't want that ,hit CTRL-C (^C)."print "If you do want that ,hit RETURN."# 这两句话没看懂,好像想要你判断但是实际上并没有判断语句raw_input("?")# 并没有什么卵用,纯粹是为了停顿print "Opening the file..."target = open(filename, 'w') # 这里的 w 其实是以 写模式 打开文件print "Truncating the file. Goodbye!"target.truncate()# 清空目标文件保存的内容print "Now I'm going to ask you for three lines."line1 = raw_input("line 1: ")#输入三行字line2 = raw_input("line 2: ")line3 = raw_input("line 3: ")print "I'm going to write these to the file."target.write(line1+'\n'+line2+'\n'+line3)#写入print "And finally ,we close it."target.close()#一定记得关闭文件print "Now we print it out:"txt = open('test.txt')#再次打开文件,记得里面直接输入文件名是要打引号的print txt.read()


一个  target.write() 的方法已经写在里面了,要注意换行的方法




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