python method to split string according to fixed length
This article mainly introduces the method of splitting strings according to fixed length in python. It has certain reference value. Now I share it with you. Friends in need can refer to it.
There are a bunch of macs as follows The address needs to be changed into a certain format, such as mac='902B345FB021' to mac='90-2B-34-5F-B0-21'.
With the help of python script, it can be easily implemented. The principle is: the string is split according to a fixed length.
1, file mac.txt, saves the following mac address:
50E549E32ECB
902B3413EFA6
50E549ECBA1C
902B3457B16F
1C6F65296DF9
902B34131A14
50E549E3E2F8
50E5493A2696
902B345FB021
902B34131574
Here are two implementation methods for your reference.
Method one:
Code sample:
#!/bin/python
#site:WWW.jb51.net
#
A = open('mac.txt','r')
a = A.readlines()
for aa in a:
b = list(aa.strip())
c=''
for i in range(len(b)):
if i !=0:
if i%2 == 0:
c=c+'-'+b[i]
else:
c=c+b[i]
else:
c=c+b[i]
print c
A.close()Method two:
Code sample:
#!/bin/python
#
import re
A = open('mac.txt','r')
a = A.readlines()
for aa in a:
b=re.findall(r'.{2}',aa)
c='-'.join(b)
print c
A.close()It is implemented using regular expressions in python, which has high execution efficiency and is worth recommending.
Processing result:
50-E5-49-E3-2E-CB
90-2B-34-13-EF-A6
50-E5-49-EC -BA-1C
90-2B-34-57-B1-6F
1C-6F-65-29-6D-F9
90-2B-34-13-1A-14
50 -E5-49-E3-E2-F8
50-E5-49-3A-26-96
90-2B-34-5F-B0-21
90-2B-34-13-15 -74
90-2B-34-18-43-BF
00-24-1D-0E-25-8D
Python is still very good at processing strings. I recommend everyone Get a firm grip.
Python splits the string into groups of three characters according to a fixed length
def cut_text(text,lenth):
textArr = re.findall('.{'+str(lenth)+'}', text)
textArr.append(text[(len(textArr)*lenth):])
return textArr
print(cut_text('123456789abcdefg',3))
['123', '456', '789', 'abc', 'def', 'g']Code 2
>>> import re
>>> string = '123456789abcdefg'
>>> re.findall(r'.{3}', string)
['123', '456', '789', 'abc', 'def']
>>>Related recommendations:
python print method of separating by comma or space
Python implementation of characters Insert a character
# at the specified position in the string
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