Adding quotes to text in line using Python

Question

I am using Visual Studio Code to replace text with Python. I am using a source file with original text and converting it into a new file with new text.

I would like to add quotes to the new text that follows. For example:

Original text: set vlans xxx vlan-id xxx

New text: vlan xxx name "xxx" (add quotes to the remaining portion of the line as seen here)

Here is my code:

    with open("SanitizedFinal_E4300.txt", "rt") as fin:
        with open("output6.txt", "wt") as fout:
            for line in fin:
                     line = line.replace('set vlans', 'vlan').replace('vlan-id', 'name')
                     fout.write(line)

Is there a way to add quotes for text in the line that follows 'name'?

Edit:

I tried this code:

    with open("SanitizedFinal_E4300.txt", "rt") as fin:
    with open("output6.txt", "wt") as fout:
    for line in fin:
     line = line.replace('set vlans', 'vlan').replace('vlan-id', 'name')
     words = line.split()
        words[-1] = '"' + words[-1] + '"'
        line = ' '.join(words)
     fout.write(line)

and received this error:

line 124, in <module>
words[-1] = '"' + words[-1] + '"'
IndexError: list index out of range

I also tried this code with no success:

    with open("SanitizedFinal_E4300.txt", "rt") as fin:
    with open("output6.txt", "wt") as fout:
    for line in fin:
    line = line.replace('set vlans', 'vlan').replace('vlan-id', 'name')
    
    import re
        t = 'set vlans xxx  vlan-id xxx'
        re.sub(r'set vlans(.*)vlan-id (.*)', r'vlan\1names "\2"', t)
        'vlan xxx  names "xxx"'

Again, my goal is to automatically add double quotes to the characters (vlan numbers) at the end of a line.

For example:

Original text: set protocols mstp configuration-name Building 2021.Rm402.access.mstp.zzz

Desired text: set protocols mstp configuration-name "Building 2021.Rm402.access.mstp.zzz"

Answer 1

First, we split the text up into words by splitting them by whitespace (which is what split does by default).

Then, we take the last word, add quotes to it, and join it back together with a space between each word:

with open("SanitizedFinal_E4300.txt", "rt") as fin:
    with open("output6.txt", "wt") as fout:
        for line in fin:
            line = line.replace('set vlans', 'vlan').replace('vlan-id', 'name')
            words = line.split()
            # print(words)                     # ['vlan', 'xxx', 'name', 'xxx']
            if words: # if the line is empty, just output the empty line
                words[-1] = '"' + words[-1] + '"'
                line = ' '.join(words)
            # print(line)                      # vlan xxx name "xxx"
            fout.write(line)

WARNING: in your question, you say you'd like the output to be vlan xxx name "xxx" which has two spaces after the first xxx. This result would only have one space between each word.