Python: Find a palindrome of a given length containing a given string
Python Programming Puzzles: Exercise-95 with Solution
Write a Python program to find a palindrome of a given length containing a given string.
Input: madam , 7 Output: madaadam Input: madam , 6 Output: maddam Input: madam , 5 Output: maaaam Input: madam , 3 Output: maam Input: madam , 2 Output: mm Input: madam , 1 Output: aa
Sample Solution:
Python Code:
#License: https://bit.ly/3oLErEI
def test(s, length):
s_index = 0
length_half = (length - (length % 2)) // 2
ans = ""
while len(ans) < length_half:
ans += s[s_index%len(s)]
s_index += 1
if length % 2 == 1:
ans += "a"
return ans + ans[::-1]
s = 'madam'
length = 7
print("String and length of the palindrome:",s,",",length)
print("Palindrome of the said string and length:")
print(test(s, length))
s = 'madam'
length = 6
print("\nString and length of the palindrome:",s,",",length)
print("Palindrome of the said string and length:")
print(test(s, length))
length = 5
print("\nString and length of the palindrome:",s,",",length)
print("Palindrome of the said string and length:")
print(test(s, length))
length = 3
print("\nString and length of the palindrome:",s,",",length)
print("Palindrome of the said string and length:")
print(test(s, length))
length = 2
print("\nString and length of the palindrome:",s,",",length)
print("Palindrome of the said string and length:")
print(test(s, length))
length = 1
print("\nString and length of the palindrome:",s,",",length)
print("Palindrome of the said string and length:")
print(test(s, length))
Sample Output:
String and length of the palindrome: madam , 7 Palindrome of the said string and length: madaadam String and length of the palindrome: madam , 6 Palindrome of the said string and length: maddam String and length of the palindrome: madam , 5 Palindrome of the said string and length: maaaam String and length of the palindrome: madam , 3 Palindrome of the said string and length: maam String and length of the palindrome: madam , 2 Palindrome of the said string and length: mm String and length of the palindrome: madam , 1 Palindrome of the said string and length: aa
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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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