来自传递给raw_input（）的文件内容副本的字符串中CR的奇怪消失
为了弄清楚似乎是一个bug的原因，我终于碰到了Python 2.7中raw_input（）函数的奇怪行为：
它仅从文件内容的手动复制（通过剪贴板）产生的字符串中删除对CR LF的CR字符。传递给raw_input（）的字符串是与前者相同的字符串显示的副本，它们不会丢失它们的CR字符。
在所有情况下，单独的CR字符保持不变。 CR（回车）是 r n字符。
为了比混乱的描述更清楚，这里有一个代码描述了观察事实必须做什么，其命令只需要执行。
这一点在Text对象中：它有7个字符而不是8个字符，这些字符被传递给raw_input（）以创建Text。
为了验证传递给raw_input（）的参数真的有8个字符，我用相同的参数创建了另一个文件PASTED.txt。在这个问题中确定一些东西确实是一个尴尬的任务，因为在Notepad ++窗口中的复制向我显示：行的各种末端（ r， n， r n）在四肢处显示为CR LF在这样的窗口中的线条。
建议使用Ctrl-A选择文件的整个数据。
我很困惑，想知道我是否犯了编码或理解的错误，或者它是否是Python的真正特征。
我希望你的评论和光明。
with open('PRIM.txt','wb') as f:
f.write('ArBnCrnD')
print " 1) A file with name 'PRIM.txt' has just been created with content A\rB\nC\r\nD"
raw_input(" Open this file and copy manually its CONTENT in the clipboard.n"+
" --when done, press Enter to continue-- ")
print "n 2) Paste this CONTENT in a Notepad++ window "+
" and see the symbols at the extremities of the lines."
raw_input(" --when done, press Enter to continue-- ")
Text = raw_input("n 3) Paste this CONTENT here and press a key : ")
print (" An object Text has just been created with this pasted value of CONTENT.")
with open('PASTED.txt','wb') as f:
f.write('')
print "n 4) An empty file 'PASTED.txt' has just been created."
print " Paste manually in this file the PRIM's CONTENT and shut this file."
raw_input(" --when done, press Enter to continue-- ")
print "n 5) Enter the copy of this display of A\rB\nC\r\nD : nArBnCrnD"
DSP = raw_input('please, enter it on the following line :n')
print " An object DSP has just been created with this pasted value of this copied display"
print 'n----------'
with open('PRIM.txt','rb') as fv:
verif = fv.read()
print "The read content of the file 'PRIM.txt' obtained by open() and read() : "+repr(verif)
print "len of the read content of the file 'PRIM.txt' ==",len(verif)
print 'n----------'
print "The file PASTED.txt received by pasting the manually copied CONTENT of PRIM.txt"
with open('PASTED.txt','rb') as f:
cpd = f.read()
print "The read content of the file 'PASTED.txt' obtained by open() and read() "+
"is now : "+repr(cpd)
print "its len is==",len(cpd)
print 'n----------'
print 'The object Text received through raw_input() the manually copied CONTENT of PRIM.txt'
print "value of Text=="+repr(Text)+
"nText.split('\r\n')==",Text.split('rn')
print 'len of Text==',len(Text)
print 'n----------'
print "The object DSP received through raw_input() the copy of the display of A\rB\nC\r\nD"
print "value of DSP==",repr(DSP)
print 'len of DSP==',len(DSP)
没有找到相关结果
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2 个回复
咳累录酬
在文本模式下打开（您可以通过显示并查看它是来检查）。如果在Python中以文本模式打开任何文件，则平台本机行结尾（Windows为）将在Python字符串中转换为简单换行符（）。 您可以通过使用模式而不是打开文件来查看此操作。宠封钞轰
with open("TestWindows.txt", 'wb') as f: f.write("PACIFIC r ARCTIC n ATLANTIC rn ") print "n- Following string have been written in TestWindows.txt in mode 'wb' :n"+ "PACIFIC \r ARCTIC \n ATLANTIC \r\n " print "n- data got by reading the file TestWindows.txt in 'rb' mode :" with open("TestWindows.txt", 'rb') as f: print " repr(data)==",repr(f.read()) print "n- data got by reading the file TestWindows.txt in 'r' mode :" with open("TestWindows.txt", 'r') as f: print " repr(data)==",repr(f.read()) print "n- data got by reading the file TestWindows.txt in 'rU' mode :" with open("TestWindows.txt", 'rU') as f: print " repr(data)==",repr(f.read())- Following string have been written in TestWindows.txt in mode 'wb' : PACIFIC r ARCTIC n ATLANTIC rn - data got by reading the file TestWindows.txt in 'rb' mode : repr(data)== 'PACIFIC r ARCTIC n ATLANTIC rn ' - data got by reading the file TestWindows.txt in 'r' mode : repr(data)== 'PACIFIC r ARCTIC n ATLANTIC n ' - data got by reading the file TestWindows.txt in 'rU' mode : repr(data)== 'PACIFIC n ARCTIC n ATLANTIC n '