How to add leading zeros to ip address using python

Question

How can i add zeros to the leading part in each byte of ip address using python so that each byte will always be in 3 digit format. The input and output should be like

1.2.3.4     ==>> 001.002.003.004
1.192.122.5 ==>> 001.192.122.005
192.168.1.1 ==>> 192.168.001.001

What is your input variable? That is, how is a single ip address stored in your code? — 9769953, Jan 22 '21 at 07:35
Have you look at Python string formatting? https://pyformat.info/ may be a good reference (which has links to the official documentation). — 9769953, Jan 22 '21 at 07:36

luigigi · Accepted Answer · 2021-01-22T07:44:33.403

1

You can use this:

ip = '1.2.3.4'
'.'.join(i.zfill(3) for i in ip.split('.'))

'001.002.003.004'

edited Jan 22 '21 at 07:44

answered Jan 22 '21 at 07:36

luigigi

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Nice, with the use of `zfill`. Note that you don't need the square brackets: `join` works on a generator expression. – 9769953 Jan 22 '21 at 07:41
@00 good point. I changed that – luigigi Jan 22 '21 at 07:44

score 1 · Answer 2 · edited Jan 22 '21 at 07:55

1

You could do this:

ip = '1.2.3.4'
print('.'.join([(3 - len(i)) * '0' + i for i in ip.split('.')]))

Output:

001.002.003.004

edited Jan 22 '21 at 07:55

9769953

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answered Jan 22 '21 at 07:40

U13-Forward

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Kien Nguyen · Answer 3 · 2021-01-22T08:02:38.887

0

You can use zfill():

def addZeros(ip, zero_num = 3):
    parts = ip.split('.')
    parts = [part.zfill(zero_num) for part in parts]
    return '.'.join(parts)
    
print(addZeros('1.2.3.4'))
# 001.002.003.004

edited Jan 22 '21 at 08:02

answered Jan 22 '21 at 07:38

Kien Nguyen

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If you make it a function `addZeros`, perhaps it's nicer to specify how many zeros are to be added (or rather, the value of `zfill`) as a function argument (with a default value). – 9769953 Jan 22 '21 at 07:55
@00 You're right. I will edit my answer. – Kien Nguyen Jan 22 '21 at 08:02

score 0 · Answer 4 · answered Jan 22 '21 at 07:40

def zero_adder(digit):
    if len(digit) == 3:
        return digit
    return zero_adder("0" + str(digit))

ips = ["1.192.122.5", "192.168.1.1", "1.2.3.4"]
output = []
for ip in ips:
    ips_with_zero = []
    for num in ip.split("."):
        ips_with_zero.append(zero_adder(num))
    output.append(".".join(ips_with_zero))
print(output)

score 0 · Answer 5 · answered Jan 22 '21 at 08:09

0

You could use an f-string with proper format:

ip = '.'.join(f'{int(n):03d}' for n in ip.split('.'))

answered Jan 22 '21 at 08:09

Riccardo Bucco

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How to add leading zeros to ip address using python

5 Answers5