Question

我有一个包含以下行的文件：

754.82915: MODE1(0, 0x001900, 0x00090)
754.82916: MODE2(0, 0x001900, 0x00090)

如何从python中的“（”到“）”获取数据？

我尝试了代码：

fo=open("file1.txt","r")
fin=open("file2.txt","w")
lines=fo.readlines()
for line in lines:
    result=re.search(r'\(.*\)', line)
    res="\n"+result.group()
    fin.write(res)
fo.close()

显示以下错误：

AttributeError: 'NoneType' object has no attribute 'group'

Answer 1

您应该考虑使用with语句和findall()模块的re函数，如下所示：

import re

with open('file1.txt', 'r') as fin:
    with open('file2.txt', 'w') as fout:
        fout.write('\n'.join(re.findall(r'\(.*\)', fin.read())))

Answer 2

坚持原始代码，只需添加一行即可检查result是否为None。

with open("file1.txt","r") as fin:
    lines = fin.readlines()
    with open("file2.txt","w") as fout:
        for line in lines:
            result = re.search(r'\(.*\)', line)
            if result:     # check if not None
                res = "\n" + result.group()
                fout.write(res)

你也应该学习@Peter的更多pythonic答案。

如何使用python在一行中提取特定数据？

2 个答案: