“p” command prints the buffer (remember to use -n option with “p”) “d” command is just opposite, its for deletion. ‘d’ will delete the pattern space buffer and immediately starts the next cycle. Syntax: # sed 'ADDRESS'd filename # sed /PATTERN/d file
用sed删除空行 我的代码如下:class Song def initialize(name) @name = name end def tell puts @name end end class ZhouSong < Song def initialize(name,artist) super(name) @artist = artist end def tell super puts @ar
#用strip(),split()两个方法都可以判断空行 infile=open('/.../','r') outfile=open('/.../','w') for li in infile.readlines(): if li.split(): #if li.strip(): outfile.writelines(li) infile.close() outfile.close()
在python中处理空行时,经常会遇到一些问题.现总结经验如下: 1.遇到的空行如果只有换行符,直接使用=='\n'或者 len(line)==line.count('\n') 2.有多个空格+换行符时.有几种处理方法:①split: ②正则表达式'^\n'(不会):③if eachLine[:-1].strip() 展开: eg.文件过滤,显示一个文件的所有行,忽略以井号(#)开头的行. ① f=open('test.txt','r') for eachLine in f: if not ea
pandas 操作csv文件时,一直报错,排查后发现csv文本中存在很多“空行”: So 需要把空行全部去掉: def clearBlankLine(): file1 = open('text1.txt', 'r', encoding='utf-8') # 要去掉空行的文件 file2 = open('text2.txt', 'w', encoding='utf-8') # 生成没有空行的文件 try: for line in file1.readlines(): if line == '\n'
sed -i -c -e '/^#/d'去掉注释行 sed -i -c -e '/^$/d'去掉空行 sed -i -c -e '/^$/d;/^#/'同时去掉空行和注释行 sed -i 's/^/HEAD&/g' passwd 在每行的头部增加HEAD sed 's/$/&TAIL/g' test.file sed -i '1!G;$!h;$!d'把文件内容倒序 后续持续更新......