为什么我不能在 python3 中的“from scapy.all import *”之前“导入日期时间”？

Question

OK, maybe i'm missing something totally obvious, but it seems that I cannot import datetime BEFORE I import "from scapy.all import *". It works fine if I import datetime AFTER I import "from scapy.all import *". I don't understand this.

Example; This does NOT work...

    #!/usr/bin/env python3
    import os
    import datetime
    from scapy.all import *
    current_time = datetime.datetime.now()
    print(current_time)

But THIS does...

    #!/usr/bin/env python3
    import os
    from scapy.all import *
    import datetime
    current_time = datetime.datetime.now()
    print(current_time)

I'm using Arch Linux, Python3 and the latest scapy.

Answer 1

Just a guess comparing your two snippets, but I suspect you have a namespace clash (welcome to the joys of programming) and that's precisely why import * is bad practice.

scapy has a datetime method too (haven't compared the definition between the two packages), so in this context the import order does matter because the definition of datetime is overridden .

The best would be to import just what you need eg:

#!/usr/bin/env python3
import os
import datetime
from scapy.all import sr, srp
current_time = datetime.datetime.now()
print(current_time)