Run Length Encoding in Python
Last Updated :
21 Jul, 2022
Given an input string, write a function that returns the Run Length Encoded string for the input string. For example, if the input string is ‘wwwwaaadexxxxxx’, then the function should return ‘w4a3d1e1x6’.
Examples:
Input : str = 'wwwwaaadexxxxxx'
Output : 'w4a3d1e1x6'
This problem has existing solution please refer Run Length Encoding link. Here we will solve this problem quickly in python using OrderedDict. Approach is very simple, first we create a ordered dictionary which contains characters of input string as key and 0 as their default value, now we run a loop to count frequency of each character and will map it to it’s corresponding key.
Implementation:
Python3
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Another code:
Python3
def encode(message):
encoded_message = ""
i = 0
while (i <= len(message)-1):
count = 1
ch = message[i]
j = i
while (j < len(message)-1):
if (message[j] == message[j+1]):
count = count+1
j = j+1
else:
break
encoded_message=encoded_message+str(count)+ch
i = j+1
return encoded_message
encoded_message=encode("ABBBBCCCCCCCCAB")
print(encoded_message)
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