Python: Compress repeated character by storing the length of a given string
Python Itertools: Exercise-17 with Solution
Write a Python program to read a given string character by character and compress repeated character by storing the length of those character(s).
Sample Solution:
Python Code:
from itertools import groupby
def encode_str(input_str):
return [(len(list(n)), m) for m,n in groupby(input_str)]
str1 = "AAASSSSKKIOOOORRRREEETTTTAAAABBBBBBDDDDD"
print("Original string:")
print(str1)
print("Result:")
print(encode_str(str1))
str1 = "jjjjiiiiooooosssnssiiiiwwwweeeaaaabbbddddkkkklll"
print("\nOriginal string:")
print(str1)
print("Result:")
print(encode_str(str1))
Sample Output:
Original string: AAASSSSKKIOOOORRRREEETTTTAAAABBBBBBDDDDD Result: [(3, 'A'), (4, 'S'), (2, 'K'), (1, 'I'), (4, 'O'), (4, 'R'), (3, 'E'), (4, 'T'), (4, 'A'), (6, 'B'), (5, 'D')] Original string: jjjjiiiiooooosssnssiiiiwwwweeeaaaabbbddddkkkklll Result: [(4, 'j'), (4, 'i'), (5, 'o'), (3, 's'), (1, 'n'), (2, 's'), (4, 'i'), (4, 'w'), (3, 'e'), (4, 'a'), (3, 'b'), (4, 'd'), (4, 'k'), (3, 'l')]
Python Code Editor:
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Previous: Write a Python program find the sorted sequence from a set of permutations of a given input.
Next: Write a Python program to generate permutations of n items in which successive permutations differ from each other by the swapping of any two items.
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Python: Tips of the Day
Find current directory and file's directory:
To get the full path to the directory a Python file is contained in, write this in that file:
import os dir_path = os.path.dirname(os.path.realpath(__file__))
(Note that the incantation above won't work if you've already used os.chdir() to change your current working directory, since the value of the __file__ constant is relative to the current working directory and is not changed by an os.chdir() call.)
To get the current working directory use
import os cwd = os.getcwd()
Documentation references for the modules, constants and functions used above:
- The os and os.path modules.
- The __file__ constant
- os.path.realpath(path) (returns "the canonical path of the specified filename, eliminating any symbolic links encountered in the path")
- os.path.dirname(path) (returns "the directory name of pathname path")
- os.getcwd() (returns "a string representing the current working directory")
- os.chdir(path) ("change the current working directory to path")
Ref: https://bit.ly/3fy0R6m
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