Python: Find the closest palindrome
Python Programming Puzzles: Exercise-93 with Solution
Write a Python program to find the closest palindrome from a given string.
Input: cat Output: cac Input: madan Output: madam Input: radivider Output: radividar Input: madan Output: madam Input: abc Output: aba Input: racecbr Output: racecar
Sample Solution:
Python Code:
#License: https://bit.ly/3oLErEI
def test(s):
odd = 0
for i, c in enumerate(s):
if c != s[~i]:
odd += 1
if odd % 2 == 1:
half = odd // 2
pal = "".join((s[i] if i < half else s[~i] for i in range(len(s))))
return pal
else:
half = odd // 2
pal = "".join((s[i] if i <= half else s[~i] for i in range(len(s))))
return pal
s = "cat"
print("Original string:",s)
print("Closest palindrome of the said string:")
print(test(s))
s = "madan"
print("\nOriginal string:",s)
print("Closest palindrome of the said string:")
print(test(s))
s = "radivider"
print("Original string:",s)
print("Closest palindrome of the said string:")
print(test(s))
s = "madan"
print("\nOriginal string:",s)
print("Closest palindrome of the said string:")
print(test(s))
s = "abc"
print("Original string:",s)
print("Closest palindrome of the said string:")
print(test(s))
s = "racecbr"
print("\nOriginal string:",s)
print("Closest palindrome of the said string:")
print(test(s))
Sample Output:
Original string: cat Closest palindrome of the said string: cac Original string: madan Closest palindrome of the said string: madam Original string: radivider Closest palindrome of the said string: radividar Original string: madan Closest palindrome of the said string: madam Original string: abc Closest palindrome of the said string: aba Original string: racecbr Closest palindrome of the said string: racecar
Flowchart:

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The following tool visualize what the computer is doing step-by-step as it executes the said program:
Python Code Editor :
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Previous: Start with a list of integers, keep every other element in place and otherwise sort the list.
Next: Separate parentheses groups.
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Python: Tips of the Day
Clamps num within the inclusive range specified by the boundary values x and y:
Example:
def tips_clamp_num(num,x,y): return max(min(num, max(x, y)), min(x, y)) print(tips_clamp_num(2, 4, 6)) print(tips_clamp_num(1, -1, -6))
Output:
4 -1
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