在第一个文件中使用搜索短语搜索和替换两个文件:Python

时间:2014-10-03 03:26:26

标签: python regex string match

文件1:

$def String_to_be_searched (String to be replaced with)

文件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

我想替换要搜索的"字符串"在文件2中用"字符串替换为"从文件1开始,文件2的每一行都有"要搜索的字符串"在里面。

我的代码:

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()

远期输出:

我将Label作为字典,包含要搜索的字符串和要替换的字符串。我首先尝试匹配两个文件中的字符串然后我必须替换。但第二部分没有给我任何匹配......我使用compare two file and find matching words in python作为参考。

1 个答案:

答案 0 :(得分:0)

对于"第二部分" - 替换File 2中的文本不需要正则表达式。只需阅读整个文件,然后使用str方法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)

如果您想使用re模块,请使用re.sub

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

对于"第一部分" - 在Label循环的每次迭代中创建一个新字典for。您应该只创建一个包含所有defs的字典;

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