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  • 如何写出好的一流文章,elsevier的一篇报告,还有挺不错的。
  • (How to write to a specific line in file in Python?)我有一个文件作为格式:xxxxxyyyyyzzzzzttttt我需要在xxxxx和yyyyy行之间写入文件:xxxxxmy_lineyyyyyyzzzzztttttI have a file as the format:...

    如何在Python中写入文件中的特定行?(How to write to a specific line in file in Python?)

    我有一个文件作为格式:

    xxxxx

    yyyyy

    zzzzz

    ttttt

    我需要在xxxxx和yyyyy行之间写入文件:

    xxxxx

    my_line

    yyyyyy

    zzzzz

    ttttt

    I have a file as the format:

    xxxxx

    yyyyy

    zzzzz

    ttttt

    And I need to write in file between xxxxx and yyyyy lines as:

    xxxxx

    my_line

    yyyyyy

    zzzzz

    ttttt

    原文:https://stackoverflow.com/questions/14340283

    更新时间:2020-02-11 22:45

    最满意答案

    with open('input') as fin, open('output','w') as fout:

    for line in fin:

    fout.write(line)

    if line == 'xxxxx\n':

    next_line = next(fin)

    if next_line == 'yyyyy\n':

    fout.write('my_line\n')

    fout.write(next_line)

    这将在文件中每次出现的xxxxx\n和yyyyy\n之间插入您的行。

    另一种方法是编写一个函数来生成行,直到它看到xxxxx\nyyyyy\n

    def getlines(fobj,line1,line2):

    for line in iter(fobj.readline,''): #This is necessary to get `fobj.tell` to work

    yield line

    if line == line1:

    pos = fobj.tell()

    next_line = next(fobj):

    fobj.seek(pos)

    if next_line == line2:

    return

    然后你可以使用这个直接传递给writelines :

    with open('input') as fin, open('output','w') as fout:

    fout.writelines(getlines(fin,'xxxxx\n','yyyyy\n'))

    fout.write('my_line\n')

    fout.writelines(fin)

    with open('input') as fin, open('output','w') as fout:

    for line in fin:

    fout.write(line)

    if line == 'xxxxx\n':

    next_line = next(fin)

    if next_line == 'yyyyy\n':

    fout.write('my_line\n')

    fout.write(next_line)

    This will insert your line between every occurrence of xxxxx\n and yyyyy\n in the file.

    An alternate approach would be to write a function to yield lines until it sees an xxxxx\nyyyyy\n

    def getlines(fobj,line1,line2):

    for line in iter(fobj.readline,''): #This is necessary to get `fobj.tell` to work

    yield line

    if line == line1:

    pos = fobj.tell()

    next_line = next(fobj):

    fobj.seek(pos)

    if next_line == line2:

    return

    Then you can use this passed directly to writelines:

    with open('input') as fin, open('output','w') as fout:

    fout.writelines(getlines(fin,'xxxxx\n','yyyyy\n'))

    fout.write('my_line\n')

    fout.writelines(fin)

    2013-01-15

    相关问答

    使用Python标准库的linecache模块: line = linecache.getline(thefilename, 33)

    应该做你想要的。 你甚至不需要打开文件 - linecache可以完成所有的工作! Use Python Standard Library's linecache module: line = linecache.getline(thefilename, 33)

    should do exactly what you want. You don't even ne

    ...

    您可以读取该文件,然后写入一些特定的行。 line_to_replace = 17 #the line we want to remplace

    my_file = 'myfile.txt'

    with open(my_file, 'r') as file:

    lines = file.readlines()

    #now we have an array of lines. If we want to edit the line 17...

    if len(lines) > int(line_t

    ...

    请尝试将WriteAllLines替换为ReadAllLines var data2 = File.ReadAllLines("itemdata.txt");

    //use linq if you want, it just an example fo understandin

    Foreach (var dataline in data2 )

    {

    if (dataline.Contains("3343"))

    dataline = "item_begin weapon 3343

    ...

    只需做到这一点: f.write('some text\n')

    请注意,正确的换行符是'\n' ,而不是'/n' Simply do this: f.write('some text\n')

    Notice that the correct newline character is '\n', not '/n'

    这就是我解决问题的方法 f1 = open ("inFile","r") # open input file for reading

    with open('out.csv', 'wb') as f: # output csv file

    writer = csv.writer(f)

    with open('in.csv','r') as csvfile: # input csv file

    reader = csv.reader(csvfile, delimiter='

    ...

    看起来你只需要修复你的状况: lines = open("input.txt", "rt")

    output = open("output.txt", "wt")

    for line in lines:

    if "Ben" not in line:

    output.write(line+"\n")

    lines.close()

    output.close()

    looks like you just need to fix your condition: lines = open("i

    ...

    使用head , echo和tail的组合,您可以创建一个包含所需行的临时文件,然后在原始文件上创建mv或cp 。 将Deny from 127.0.0.1添加到您的示例.htaccess: (head -n -1 .htaccess

    echo 'Deny from 127.0.0.1'

    tail -n 1 .htaccess) > .htaccess.tmp

    mv -b .htaccess.tmp .htaccess

    # cat .htaccess

    Or

    ...

    with open('input') as fin, open('output','w') as fout:

    for line in fin:

    fout.write(line)

    if line == 'xxxxx\n':

    next_line = next(fin)

    if next_line == 'yyyyy\n':

    fout.write('my_line\n')

    ...

    示例代码: string_to_check = "name 2"

    string_to_add = "name 1,"

    with open("test.txt", 'r+') as file_to_write:

    lines = file_to_write.readlines()

    file_to_write.seek(0)

    file_to_write.truncate()

    for line in lines:

    if line.startswith(str

    ...

    展开全文
  • 在使用sprintf时,编译时会检测格式化输出的缓存大小,如果缓存过小,则会出现该警告,比如代码如下就会出现这样的警告 void func(int cnt) { char buf[10]; sprintf(buf, "%d", cnt); ...解决办法:只需要将buf...

        在使用sprintf时,编译时会检测 格式化输出的 缓存大小,如果缓存过小,则会出现该警告,比如代码如下就会出现这样的警告

    void func(int cnt)
    {
        char buf[10];
        
        sprintf(buf, "%d", cnt);
        // ....
    }

     解决办法:只需要将 buf的大小 改大即可,如下:

    char buf[32];

     

    展开全文
  • Write a program that reads an expression in a line as input and prints out the result. Only non-negative integers and operators below are allowed in the expression:+ - * / % ( )输入格式:A line of ...
  • a=raw_input("input a:") b=raw_input("input b:") if a>b: print (a+">"+b) elif a==b: print (a+"="+b) else: print (a+" 运行时,出错: ------------------------Traceb

    sublime2运行用户输入数据程序:

     代码:

    a=raw_input("input a:")
    b=raw_input("input b:")
    if a>b:
    print (a+">"+b)
    elif a==b:
    print (a+"="+b)
    else:
    print (a+"<"+b)

    运行时,出错:

    ------------------------Traceback (most recent call last):-
    input a:
      File "C:\Users\Administrator\Desktop\py\02dataType.py", line 27, in <module>
        if a>b:
    NameError: name 'a' is not defined
    [Finished in 0.3s with exit code 1]

    解决方法:

    安装SublimeREPL

    打开Sublime Text2编辑器,按 Ctrl+Shift+p,输入install,选择Package Control: Install Package,接着输入sublimeREPL,回车即可安装,安装完毕,重启sublime即可。


    方法一:在线安装,首先打开 Ctrl + ~,输入如下的代码:
    import urllib2,os; pf='Package Control.sublime-package'; ipp = sublime.installed_packages_path(); os.makedirs( ipp ) if not os.path.exists(ipp) else None; urllib2.install_opener( urllib2.build_opener( urllib2.ProxyHandler( ))); open( os.path.join( ipp, pf), 'wb' ).write( urllib2.urlopen( 'http://sublime.wbond.net/' +pf.replace( ' ','%20' )).read()); print( 'Please restart Sublime Text to finish installation') 

    安装完了之后重启软件即可。

    ps:输入Ctrl + Shift + P 然后输入Install Package看是否可以调出来Install Package验证下安装是否成功。

    方法二:离线安装,前提是需要一个Package Control的安装包,将该安装包替换到Sublime Text2的相关路径下即可,这里有两个路径,经验证放置到其中任意一处均可。

    • 路径一:打开Sublime Text 2,点击PreFerences --> Browse Packages,进入一个文件夹后返回该文件夹的上一级“Sublime Text2”,找到一个“Installed Packages”文件夹(如果没有该文件夹则创建个新的),将下载好的Package Control的安装包放到“Installed Packages”文件夹下即可。
    • 路径二:Sublime Text 2 的安装路径,“Sublime Text 2\Pristine Packages\”文件夹下。

    运行:

    编译python文件的时候,可以选择【Tools】——【sublimeREPL】——【python】——【Python – RUN current file】即可提示用户输入。

    展开全文
  • 要在sublime Text3中编译运行Python文件时,如果代码中带有需要用户输入的函数时(raw_input)会提示错误:EOFError: EOF when reading a line

    要在sublime Text3中编译运行Python文件时,如果代码中带有需要用户输入的函数时(raw_input)会提示错误:EOFError: EOF when reading a line

    例如:

    # study.py
    
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    print 'hello,', name
    

    Build以后提示EOFError: EOF when reading a line

    解决办法:

    1.首先SublimeText3必须安装PackageControl插件(菜单项Preferences下有PackageControl)

    如果没有请安装,步骤如下:

    最简单的方式是通过SublimeText 3的console命令界面进行安装。

    使用 ctrl+`快捷键 或者 菜单项View > ShowConsole 来调出命令界面。

    然后复制粘贴下面的Python代码到命令输入框中:
    import urllib.request,os,hashlib; h = '7183a2d3e96f11eeadd761d777e62404' + 'e330c659d4bb41d3bdf022e94cab3cd0'; pf = 'Package Control.sublime-package'; ipp = sublime.installed_packages_path(); urllib.request.install_opener( urllib.request.build_opener( urllib.request.ProxyHandler()) ); by = urllib.request.urlopen( 'http://sublime.wbond.net/' + pf.replace(' ', '%20')).read(); dh = hashlib.sha256(by).hexdigest(); print('Error validating download (got %s instead of %s), please try manual install' % (dh, h)) if dh != h else open(os.path.join( ipp, pf), 'wb' ).write(by)
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    2. 安装sublimeREPL

    打开SublimeText3,按Ctrl+Shift+P,输入 :install 后选择“PackageControl: Install Package”

    在弹出的界面内输入sublimeREPL回车等待安装完成(由于我已经安装了,所以下图选项中未出现sublimeREPL)

    另外如果下载速度很慢,请挂代理安装。

    完成后重启SublimeText3,如果菜单项Tools下出现sublimeREPL,则安装成功。

    3、运行Python文件

    方法1:在待运行文件下,按Ctrl+Shift+P,选择“Python – RUN current file”

    方法2:菜单Tools>SublimeREPL>Python>Python – RUN current file

    对于我这个程序有如下结果:



    展开全文
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