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Python Exercise: Reverse a string

Python Functions: Exercise-4 with Solution

Write a Python program to reverse a string.

Sample String: "1234abcd"
Expected Output: "dcba4321"

Sample Solution-1:

Python Code:

def string_reverse(str1):

    rstr1 = ''
    index = len(str1)
    while index > 0:
        rstr1 += str1[ index - 1 ]
        index = index - 1
    return rstr1
print(string_reverse('1234abcd'))

Sample Output:

dcba4321  

Pictorial presentation:

Python exercises: Reverse a string.

Flowchart:

Flowchart: Python exercises: Reverse a string.

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:

def reverse(itr):
  return itr[::-1]

str1 = '1234abcd'
print("Original string:",str1)
print("Reverse strig:",reverse('1234abcd'))
str1 = 'reverse'
print("\nOriginal string:",str1)
print("Reverse strig:",reverse(str1))

Sample Output:

Original string: 1234abcd
Reverse strig: dcba4321

Original string: reverse
Reverse strig: esrever

Flowchart:

Flowchart: Python exercises: Reverse a string.

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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Python: Tips of the Day

Decapitalizes the first letter of a string:

Example:

def tips_decapitalize(s, upper_rest=False):
  return s[:1].lower() + (s[1:].upper() if upper_rest else s[1:])
print(tips_decapitalize('PythonTips'))
print(tips_decapitalize('PythonTips', True)) 

Output:

pythonTips
pYTHONTIPS