以下是该过程的高级概述：
1.按顺序打开和读取文件：不要同时将两个文件加载到内存中，而是一个接一个地读取它们。
1.在Chunks中处理
1.关闭并释放资源
1.重复：继续阅读、处理和合并块，直到处理完整个文件。
下面是一个Python代码片段，说明了这种方法：

merged_data = []

# Process the first file
with open('file1.txt', 'rb') as file1:
    while True:
        chunk = file1.read(1024)  # Read 1MB at a time (adjust chunk size as needed)
        if not chunk:
            break  # End of file
        merged_data.append(chunk)

# Process the second file
with open('file2.txt', 'rb') as file2:
    while True:
        chunk = file2.read(1024)  # Read 1MB at a time (adjust chunk size as needed)
        if not chunk:
            break  # End of file
        merged_data.append(chunk)

# Merge the chunks into a single variable
final_data = b''.join(merged_data)

# Now 'final_data' contains the merged content of both files