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Python，当同时读写文件时，文本会很奇怪_Python - Fatal编程技术网
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Python，当同时读写文件时，文本会很奇怪

python

Python，当同时读写文件时，文本会很奇怪,python,Python,当我尝试用Python同时读写一个.txt文件时，结果非常奇怪 from sys import argv script, filename = argv print """The contents of this .txt file will now be erased. if you don don't wish to do this. Hit CTRL+C. if you want to do this. Just click ENTER. """ raw_input("> ")

当我尝试用Python同时读写一个.txt文件时，结果非常奇怪

from sys import argv

script, filename = argv

print """The contents of this .txt file will now be erased.
if you don don't wish to do this. Hit CTRL+C.
if you want to do this. Just click ENTER.
"""
raw_input("> ")

target = open(filename, 'w+') #opens the file to read+write simultaneously

newline1 = raw_input("the first line: ") #three lines of strings to add to the .txt file
newline2 = raw_input("the second line: ") 
newline3 = raw_input("the third line: ")


target.write(("%s\n%s\n%s") % (newline1, newline2, newline3)) #writes the lines to the file

print "this is what's currently written inside the .txt file:\n"
print target.read() #reads the contents of the file 
target.close() #closes and saves the file
但是文件的内容只是在.txt文件中读取这个jibberish，当它在程序中读取时，而不是3行简单的代码：

 s·   d  Z  d d l Z d e j f d „  ƒ  YZ d e j f d „  ƒ  YZ d e j f d „  ƒ  YZ d   e e j f d
 „  ƒ  YZ d e e j f d „  ƒ  YZ d
 „  Z d Z e j    e ƒ Z
 d S(   sv    Python Character Mapping Codec cp1252 generated from 'MAPPINGS/VENDORS/MICSFT/WINDOWS/CP1252.TXT' with gencodec.py.

iÿÿÿÿNt   Codecc           B   s    e  Z d  d „ Z d  d „ Z RS(   t   strictc         C   s   t  j | | t ƒ S(   N(   t   codecst   charmap_encodet   encoding_table(   t   selft   inputt   errors(    (    s#   C:\Python27\lib\encodings\cp1252.pyt   encode   s    c         C   s   t  j | | t ƒ S(   N(   R   t   charmap_decodet   decoding_table(   R   R   R   (    (    s#   C:\Python27\lib\encodings\cp1252.pyt   decode   s    (   t   __name__t
   __module__R   R   (    (    (    s#   C:\Python27\lib\encodings\cp1252.pyR          s   t   IncrementalEncoderc           B   s   e  Z e d  „ Z RS(   c         C   s   t  j | |  j t ƒ d S(   Ni    (   R   R   R   R   (   R   R   t   final(    (    s#   C:\Python27\lib\encodings\cp1252.pyR      s    (   R   R
   t   FalseR   (    (    (    s#   C:\Python27\lib\encodings\cp1252.pyR      s   t   IncrementalDecoderc           B   s   e  Z e d  „ Z RS(   c         C   s   t  j | |  j t ƒ d S(   Ni    (   R   R       R   R
   (   R   R   R   (    (    s#   C:\Python27\lib\encodings\cp1252.pyR      s    (   R   R
   R   R   (    (    (    s#   C:\Python27\lib\encodings\cp1252.pyR      s   t   StreamWriterc           B   s   e  Z RS(    (   R   R
   (    (    (    s#   C:\Python27\lib\encodings\cp1252.pyR      s   t   StreamReaderc           B   s   e  Z RS(    (   R   R
   (    (    (    s#   C:\Python27\lib\encodings\cp1252.pyR      s   c           C   s@   t  j d d d t ƒ  j d t ƒ  j d t d t d t d t ƒ S(      Nt   namet   cp1252R   R   t   incrementalencodert   incrementaldecodert   streamreadert   streamwriter(    R   t       CodecInfoR    R   R   R   R   R   R   (    (    (    s#   C:\Python27\lib\encodings\cp1252.pyt   getregentry!   s        u–      

 !"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~€￾‚ƒ„…†‡ˆ‰Š‹Œ￾Ž￾￾‘’“â€â€¢â€“—˜™š›œ￾žŸ ¡¢£¤¥¦§¨©ª«¬­®¯°±²³´µ¶·¸¹º»¼½¾¿ÀÃÂÃÄÅÆÇÈÉÊËÌÃÃŽÃÃÑÒÓÔÕÖ×ØÙÚÛÜÃÞßàáâãäåæçèéêëìíîïðñòóôõö÷øùúûüýþÿ(   t   __doc__R   R    R   R   R   R   R   R
   t
   charmap_buildR   (    (    (    s#   C:\Python27\lib\encodings\cp1252.pyt   <module>   s     ÿ            ó:›› ™øÌ pò  åP§ü                        a^v– Qý LýHVzàý0DýI.*Èý ýJ²ã¨@ÏüðÒüK6=XÙü0Ùü                        NÆü­ü ËüOžç5˜¯üp¯ü±v%P¿õýüQöy€Íüà­ü•ëw@MýMýSž@3 èü˜õü_å’Ï`FýøDý            ßEïÐþü­ü¹ý¥t€ìüXþüXžf9`âü0Ùü            Z2ðÀãüˆÛü            O°s÷ÀýhØü]B] ìüþü^ÒÏZ€ýðý_NÅô Èü §ü            GbP€åüÐÞüDÆí OüXþüc20F@HýxGýH¯«ÐPBý ¬üeú¿ýüðüüf¾Àëü(üüeõ5¸óüóü            ¼å»úXDý0Dý            k®à áüÔülš¦ âü0¤ü            n"éÍ@!ý8Aý½-ò¡àý¸ý            q.&yxLýPLý            s¦v8(×ü0Ôü            ¾]ª[àÝü¸Ýü;
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编辑：在我添加target.seek0行之后，它就工作了。但是，如果知道是什么导致了jibberish的出现，那还是很有趣的

您可能希望在搜索之前尝试使用file.flush

否则，保留文件的两个句柄：

file = open(filename, "w")
file.write(stuff)
file.close()

file = open(filename, "r")
file.read()
我不认为写和转读文件是好的做法。

< P>我也有同样的问题。当我问我的老师时，他说发生这种情况是因为我在写文件后试图读取文件，并且由于写入文件，指针移到了文件的末尾，但根据我们的预期，我们希望从一开始就读取文件，因此我们需要使用file_object.seek0，它将指针设置到第0个位置，并且工作正常

f=open('new.txt','w+') 
f.write("i am new to python")
f.seek(0)
data=f.read() 
print (data)
f.close()
在读取之前尝试target.seek0？如果不倒带文件位置标头，则无法先写入，然后读取。使用file.seek执行此操作file.seek0返回到开始处。在print target.read之前添加target.seek0将获得预期的输出。即使没有seek调用，我仍然可以在文本文件中看到正确的输出，我不确定您的文件中怎么会有这么多乱七八糟的内容。我认为试图读取文件是乱七八糟的原因。我只是在python 2.7.6中没有得到任何输出。这是一个问题还是一个答案？我删除的一些材料让它看起来像一个问题，但剩下的材料看起来像是我的答案。