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:
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:
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:
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
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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