pythonl练习笔记——multiprocessing 多进程拷贝文件

分两份拷贝文件，父进程拷贝文件的前半部分，子进程拷贝文件的后半部分。

import os
import time
 
#获取文件大小
size = os.path.getsize('wait.py')
# f = open('wait.py')
 
pid = os.fork()
 
if pid < 0:
    print('create process failed')
elif pid == 0:
    n = size // 2
    fw = open('child','w')
    with open('wait.py') as f:
        while True:
            if n < 64:
                data = f.read(n)
                fw.write(data)
                break
            data = f.read(64)
            fw.write(data)
            n -= 64
    fw.close()
else:
    fw = open('parent','w')
    with open('wait.py') as f:
        f.seek(size // 2,0)
        while True:
            data = f.read(64)
            if not data:
                break
            fw.write(data)
    fw.close()