删除文件中的空格和空行使用Python

Question

我有一个包含值为2000,00的文件。

但它包含2000,00后的空格和空行。

我想删除所有的空格和空行，如果有人能够给出一些想法，我已经尝试了很多方法，但没有成功。

一种方法我累是如下

# Read lines as a list 
fh = open("transfer-out/" + file, "r") 
lines = fh.readlines() 
fh.close() 
# Weed out blank lines with filter 
lines = filter(lambda x: not x.isspace(), lines) 
# Write "transfer-out/"+file+".txt", "w" 
fh = open("transfer-out/"+file, "w") 
#fh.write("".join(lines)) 
# should also work instead of joining the list: 
fh.writelines(lines) 
fh.close() 

Answer 1

strip()移除的前缘和后空格字符。

with open("transfer-out/" + file, "r") as f: 
    for line in f: 
     cleanedLine = line.strip() 
     if cleanedLine: # is not empty 
      print(cleanedLine) 

然后，您可以将脚本重定向到文件python clean_number.py > file.txt，例如。

Answer 2

，你想这应该工作：

file(filename_out, "w").write(file(filename_in).read().strip()) 

编辑：虽然前面的代码在Python 2.x的工作，这是行不通的巨蟒-3（见@gnibbler评论）对于这两个版本中使用这样的：

open(filename_out, "w").write(open(filename_in).read().strip()) 

Answer 3

另外一个与列表理解：

clean_lines = [] 
with open("transfer-out/" + file, "r") as f: 
    lines = f.readlines() 
    clean_lines = [l.strip() for l in lines if l.strip()] 

with open("transfer-out/"+file, "w") as f: 
    f.writelines('\n'.join(clean_lines)) 

Answer 4

改变你的'线'线来使用下面的发电机，它应该做的伎俩。

lines = (line.strip() for line in fh.readlines() if len(line.strip())) 

Answer 5

功能的:)

import string 
from itertools import ifilter, imap 

print '\n'.join(ifilter(None, imap(string.strip, open('data.txt')))) 
# for big files use manual loop over lines instead of join 

用法：

$ yes "2000,00 " | head -n 100000 > data.txt 
$ python -c "print '\n'*100000" >> data.txt 
$ wc -l data.txt 
200001 data.txt 
$ python filt.py > output.txt 
$ wc -l output.txt 
100000 output.txt