如何在 python 中分配价值并重新加入？

Question

I'm working with IP, so on the loop it should be increasing the a value to different devices to retrieve data. How do I change the a value and rejoin as the IP address?

ip = 192.168.10.a
a = 100 + n    // assume n=5
// So a = 105

I need replace the IP a to particular value, and rejoin it as IP address.

Expected output:

ip = 192.168.10.105
// `n` is not a constant; it will change time to time.

Answer 1

A version with f-strings and range :

>>> ip = "192.168.10."
>>> for i in range(100, 260, 5):
...     new_ip = f"{ip}{i}"
...     print(new_ip)
... 
192.168.10.100
192.168.10.105
192.168.10.110
192.168.10.115
[...]

Answer 2

Try this:

ip = "192.168.10.{}"
a = 100
for i in range(10): # assuming you want 10 IP addresses:
    new_ip = ip.format(a)
    print("Hello new_ip: {}".format(new_ip))
    a += 5
    if a > 255:
        # do something about it
        pass

Answer 3

I would suggest using a list to store and manipulate the ip and only convert it to a string for output afterward:

n     = 5
ip    = "192.168.10.0".split(".")    # [192,168,10,0]
ip[3] = 100+n
print(".".join(map(str,ip)))         # '192.168.10.105'

If your ip string actually contains the letter a , you could replace it directly to form a new string:

ip = "192.168.10.a"
print(ip.replace("a",str(100+n)))    # '192.168.10.105'