用字符串定义IP地址并替换最后一个八位字节

Question

I have an IP address in my code Python 3.0 and I want to replace last octet to 0.

For example, host = 10.10.10.15 to host_changed = 10.10.10.0

Answer 1

Use .rfind()

The rfind() method finds the last occurrence of the specified value.

host = "10.10.10.15"
host = host[:host.rfind('.')+1] + '0'
print (host)

output:

10.10.10.0

Answer 2

Assuming ip is a string, you can use '.'.join(ip.split('.')[:-1]+["0"])

For instance,

>>> ip = '10.123.43.15'
>>> '.'.join(ip.split('.')[:-1]+["0"])
'10.123.43.0'

Answer 3

you can try:

host = "10.10.10.15"

host_list = host.split(".")[:-1]
host_list.append("0")
host = ".".join(host_list)
print(host)

Output:

10.10.10.0