1. 首先需要在 DAG（有向无环图）文件中定义一个 PythonOperator 任务。此任务应包含要处理的文件路径列表：

# Import the necessary modules
import os
from airflow import DAG
from airflow.operators.python_operator import PythonOperator

# Define the DAG details
dag = DAG(
   'file_processing_task', 
   default_args=args, 
   schedule_interval=None
)

# Define the list of file paths to be processed
file_list = ['/path/to/file1', '/path/to/file2', '/path/to/file3']

def process_files(file_paths):
   # Loop through the file paths list and process each file
   for file_path in file_paths:
      # Add your file processing code here
      pass

# Create a PythonOperator to process the files
process_file_operator = PythonOperator(
   task_id='file_processing_task', 
   python_callable=process_files, 
   op_args=[file_list],
   dag=dag
)

2. 接下来，在另一个 PythonOperator 任务中可以获取和处理处理过文件的信息。例如，您可以计算文件夹中包含的文件数量或统计各个文件的行数：

# Define a function to count the number of files in a directory
def count_files(directory):
   # Use the os module to count the number of files in the directory
   file_count = len(os.listdir(directory))
   # Return the file count as a string
   return str(file_count)

# Define a PythonOperator to get the file count from the previous task
get_file_count_operator = PythonOperator(
   task_id='get_file_count_task', 
   python_callable=count_files,
   op_args=['/path/to/file/folder'],
   dag=dag
)

# Define a function to count the number of lines in a file
def count_lines(file_path):
   # Use the Python built-in file open function to read the file
   with open(file_path, 'r') as file:
      # Use the built-in len() function to count the number of lines in the file
      line_count = len(file.readlines())
   # Return the line count as a string
   return str(line