如何将字符串值与文本文件中的每一行连接 Python

Question

我有一个包含 70 万行的大型文本文件。我想在每一行中连接或附加小字符串“/products/all.atom”。

我试过这个代码

enter code here
import os
import sys
import fileinput

print ("Text to search for:")
textToSearch = input( "> " ) 

print ("Text to replace it with:")
textToReplace = input( "> " )

print ("File to perform Search-Replace on:")
fileToSearch  = input( "> " )
#fileToSearch = 'D:\dummy1.txt'

tempFile = open( fileToSearch, 'r+' )

for line in fileinput.input( fileToSearch ):
if textToSearch in line :
    print('Match Found')
else:
    print('Match Not Found!!')
tempFile.write( line.replace( textToSearch, textToReplace ) )
tempFile.close()


input( '\n\n Press Enter to exit...' )

但是代码并不完美，我在这里做的是用“.com/products/all.atom”替换“.com”但是当我运行这个命令循环变得无限并且它写入大小为 10gb 的文件。

这是我想要的示例：

store1.com > store1.com/products/all.atom
store2.com > store2.com/products/all.atom
store3.com > store3.com/products/all.atom

click here to check text file

请帮助我。

Answer 1

fo=open('sta.txt','r+') # open file for read    
lines=fo.read() # reading lines in file 
fo.close()  
fo=open('sta.txt','w') # open file for Write    
for i in lines.split('\n')[:-1]:  #split the lines (using \n)and avoid last one
    fo.write(i+' hai \n') # write new lines #replace 'hai with what you need to append
fo.close()

Answer 2

尝试列表理解和字符串连接：

with open('file.txt','r') as f:
    print([line.strip() + "/products/all.atom" for line in f])

输出：

['store1.com/products/all.atom', 'store2.com/products/all.atom', 'store3.com/products/all.atom', 'store4.com/products/all.atom']

更新的解决方案：

以下是您在新文件中的写入方式：

with open('names','r') as f:
    data=[line.strip() + "/products/all.atom" for line in f]
    with open('new_file','w+') as write_f:
        for line_1 in data:
            write_f.write(line_1 + '\n')

Answer 3

转换很简单，您只需对 from 和 to 字符串执行 str.replace。写入一个临时文件，这样您就不会在您仍在处理它时覆盖它，并在完成后重命名它。

file.writelines() 方法采用迭代器并重复调用它以获取要写入的行。我使用了一个生成器来读取文件的每一行并替换文本。

import os

print ("Text to search for:")
textToSearch = input( "> " ) 

print ("Text to replace it with:")
textToReplace = input( "> " )

print ("File to perform Search-Replace on:")
fileToSearch  = input( "> " )

outName = fileToSearch + ".tmp"

with open(fileToSearch) as infile, open(outName, 'w') as outfile:
    outfile.writelines(line.replace(textToSearch, textToReplace) for line in infile)

print("Lines replaced, do you want to overwrite original file? (y/n):")
replace = input("> ")
if replace.startswith ('y'):
    os.remove(fileToSearch)
    os.rename(outName, fileToSearch)

input( '\n\n Press Enter to exit...' )

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