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Python Challenges: Encode a string amount into integer

Python Challenges - 1: Exercise-50 with Solution

Write a Python program that takes a string and encode it that the amount of symbols would be represented by integer and the symbol.
For example, the string "AAAABBBCCDAAA" would be encoded as "4A3B2C1D3A"

Sample Solution:

Python Code:

def encode_string(str1):
    encoded = ""
    ctr = 1
    last_char = str1[0]

    for i in range(1, len(str1)):

        if last_char == str1[i]:
            ctr += 1
         
        else:
            encoded += str(ctr) + last_char
            ctr = 0
            last_char = str1[i]
            ctr += 1
    encoded += str(ctr) + last_char
    return encoded
print(encode_string("AAAABBBCCDAAA")) 
print(encode_string("PHP"))  
print(encode_string("AAAABBBCCCDAABDAAAAC"))

Sample Output:

4A3B2C1D3A
1P1H1P
4A3B3C1D2A1B1D4A1C

Flowchart:

Python Flowchart: Encode a string amount into integer.

Python Code Editor:

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Previous: Write a Python program to find the index of the first term in the Fibonacci sequence to contain 500 digits.
Next: Write a Python program that takes a string of numbers and letters and return string which consists of letters.

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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