Python: Circular shift number

Python Programming Puzzles: Exercise-65 with Solution

Write a Python program to shift the decimal digits n places to the left, wrapping the extra digits around. If shift > the number of digits of n, reverse the string.

Input:
n = 12345  and shift = 1
Output:
Result =  23451
Input:
n = 12345  and shift = 2
Output:
Result =  34512
Input:
n = 12345  and shift = 3
Output:
Result =  45123
Input:
n = 12345  and shift = 5
Output:
Result =  12345
Input:
n = 12345  and shift = 6
Output:
Result =  54321

Pictorial Presentation:

Sample Solution-1:

Python Code:

#License: https://bit.ly/3oLErEI

def test(n, shift):
    s = str(n)
    if shift > len(s):
        return s[::-1]
    return s[shift:] + s[:shift]
 
print("Shift the decimal digits n places to the left. If shift > the number of digits of n, reverse the string.:") 
 
n = 12345
shift = 1
print("\nn =",n," and shift =",shift)
print("Result = ",test(n, shift))
n = 12345
shift = 2
print("\nn =",n," and shift =",shift)
print("Result = ",test(n, shift))
n = 12345
shift = 3
print("\nn =",n," and shift =",shift)
print("Result = ",test(n, shift))
n = 12345
shift = 5
print("\nn =",n," and shift =",shift)
print("Result = ",test(n, shift))
n = 12345
shift = 6
print("\nn =",n," and shift =",shift)
print("Result = ",test(n, shift))

Sample Output:

Shift the decimal digits n places to the left. If shift > the number of digits of n, reverse the string.:

n = 12345  and shift = 1
Result =  23451

n = 12345  and shift = 2
Result =  34512

n = 12345  and shift = 3
Result =  45123

n = 12345  and shift = 5
Result =  12345

n = 12345  and shift = 6
Result =  54321

Flowchart:

Visualize Python code execution:

The following tool visualize what the computer is doing step-by-step as it executes the said program:

Sample Solution-2:

Python Code:

#License: https://bit.ly/3oLErEI

def test(n, shift):
    shifted_digits = [int(x) for x in str(n)]
    for i in range(shift):
        shifted_digits.append(shifted_digits.pop(0))
    if shift > len(shifted_digits):
        return str(n)[::-1]
    else:
        return ''.join(str(x) for x in shifted_digits)
 
print("Shift the decimal digits n places to the left. If shift > the number of digits of n, reverse the string.:") 
 
n = 12345
shift = 1
print("\nn =",n," and shift =",shift)
print("Result = ",test(n, shift))
n = 12345
shift = 2
print("\nn =",n," and shift =",shift)
print("Result = ",test(n, shift))
n = 12345
shift = 3
print("\nn =",n," and shift =",shift)
print("Result = ",test(n, shift))
n = 12345
shift = 5
print("\nn =",n," and shift =",shift)
print("Result = ",test(n, shift))
n = 12345
shift = 6
print("\nn =",n," and shift =",shift)
print("Result = ",test(n, shift))

Sample Output:

Shift the decimal digits n places to the left. If shift > the number of digits of n, reverse the string.:

n = 12345  and shift = 1
Result =  23451

n = 12345  and shift = 2
Result =  34512

n = 12345  and shift = 3
Result =  45123

n = 12345  and shift = 5
Result =  12345

n = 12345  and shift = 6
Result =  54321

Flowchart:

Visualize Python code execution:

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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