文件输入作为行与文件输入作为字符串

Question

I have a list of files that I want to iterate over with RegEx replacements, some on individual lines, some that require multiline matches.

I am able to iterate over lines in a list of files and write to disk using this method.

import fileinput, re

ListFiles = ['in/spam.txt', 'in/eggs.txt', 'in/spam2.txt', 'in/eggs2.txt', 
'in/spam3.txt', 'in/eggs3.txt', 'in/spam4.txt', 'in/eggs4.txt',
'in/spam5.txt', 'in/eggs5.txt']

with fileinput.input(files=(ListFiles), inplace=True, backup='.bak') as f:
    for line in f:
        line = re.sub(r'this','that', line)
        print(line, end='')

Now I want to gather the output lines in f as a string, for which I can run multiline RegEx routines.

I tried a with(open) , which I have been able to use to use with ReGex a single file, but it does not take a list as an argument, only a file name.

with open("spam.txt", "w") as f: # sample other use, list not allowed here.
    data = f.read()
    data = re.sub(r'sample', r'sample2', data)
    print(data, file=f)

And I tried to gather f as a string into new variable data, as follows:

data = f(str)
data = re.sub(r'\\sc\{(.*?)\}', r'<hi rend="small_caps">\1</hi>', data) ## Ignore that this not multiline Regex for sample purposes only.
print(data)

But that produces error, that FileInput is not callable.

Is there a way that I can iterate and apply RegEx to files as line and as the same files as string in same with statement?

Answer 1

If it is ok to read individual files into memory as a whole then to perform multiline replacements in a list of files, you could process one file at a time:

for filename in ListFiles:
    with open(filename) as file: 
        text = file.read() # read file into memory
    text = text.replace('sample\n1', 'sample2') # make replacements
    with open(filename, 'w') as file: 
        file.write(text) # rewrite the file