使用第一个文件中的搜索短语在两个文件之间进行搜索和替换：Python

Question

File 1:

$def String_to_be_searched (String to be replaced with)

File 2:

..... { word { ${String to be searched} } # each line in File 2 is in this format
..... { word { ${String} } # This line need not be replaced. Only lines which matches the string in file 1 needs to be replaced

I want to replace the "String to be searched" in file 2 with "String to be replaced with" from file 1 once each line of file 2 has the "String to be searched" in it.

My Code:

def labelVal(line):
    return line[line.find('(') + 1: line.rfind(')')]

for line in File 1:
    Label = {}
    line = line.strip()
    if line.startswith('$def'):
        labelKeys = line .split()[1]
        #print labelKeys
        labelValues = labelVal(line)
        #print labelValues
        Label[labelKeys] = labelValues
        #print Label
outfile = open('path to file','w')

for line in File 2:
    match = re.findall(r'\$\{(\w+)\}', line) # Here I am searching for the pattern ${String to be searched}
    if match:
        print match.group()

Output So Far:

I have the Label as a Dictionary with the String to be searched and the string to be replaced. I am first trying to match the string in both files then I have to replace. But The second part does not give me any match... I used compare two file and find matching words in python this as a reference.

Answer 1

For the "second part" - a regex isn't necessary to replace the text in File 2 . Just read the entire file and use the str method replace .

with open('tobefixed.txt') as f:
    data = f.read()

for search_txt, replacement_txt in Label.iteritems():
    data = data.replace(search_txt, replacement_txt)

with open('fixed.txt', 'w') as f:
    f.write(data)

If you want to use the re module, use re.sub :

for search_txt, replacement_txt in Label.iteritems():
    data = re.sub(search_txt, replacement_txt, data)
print data

---

For the "first part" - you create a new dictionary, Label , in every iteration of the for loop. You should just create one dictionary with all the defs in it;

with open('defs.txt') as f:
    Label = {}
    for line in f:
        line = line.strip()
        if line.startswith('$def'):
            labelKeys = line .split()[1]
            labelValues = labelVal(line)
            Label[labelKeys] = labelValues