python - 遍历字符串列表直到 string == newline

Question

我正在尝试从文件中读取选择性信息。文件结构如下:

Component1:
   Detail1
   Detail2
   Detail3

Component2:
   Detail1
   Detail2
   Detail3

Component3:
   Detail1
   Detail2
   Detail3

Component4:
   Detail1
   Detail2
   Detail3

文件有限。行，我正在将该文件读入行列表。

with open('/tmp/filename.txt', 'r') as openf:
            for line_no, line in enumerate(openf):
                file_lines_list.append(line)

我想选择性的读取Component2的信息

所以我写了下面的代码。

with open('/tmp/filename.txt', 'r') as f:
                for line_no, line in enumerate(f):
                    if "Component2" in line:
                       x = line_no
                       print(x)
                       for item in file_lines_list[x:]:
                           if item != "\n":   
                              tmp_file.write(item)
                           else:
                              break

但是它打印行直到列表(文件行)的末尾。它不会在第一次出现换行符时中断，理想情况下应该是 Component3 之前的行。 (组件细节之间没有换行符)有人可以指出我在这里做错了什么吗？

Answer 1

使用 str.startswith()连同一个 bool 标志:

list.txt:

Component1:
   C1_Detail1
   C1_Detail2
   C1_Detail3

Component2:
   C2_Detail1
   C2_Detail2
   C2_Detail3

Component3:
   C3_Detail1
   C3_Detail2
   C3_Detail3

Component4:
   C4_Detail1
   C4_Detail2
   C4_Detail3

因此:

with open('list.txt', 'r') as f:
    content = f.readlines()

# you may also want to remove empty lines
content = [l.strip() for l in content if l.strip()]
bFlag = False
for line in content:
    if line.startswith('Component2'):
        bFlag = not bFlag
    if bFlag:
        if 'Component3' in line:
            break
        else:
            print(line)

输出:

Component2:
C2_Detail1
C2_Detail2
C2_Detail3