Python: Reverse the case of all strings. For those strings, which contain no letters, reverse the strings
Python Programming Puzzles: Exercise-52 with Solution
Write a Python program to reverse the case of all strings. For those strings, which contain no letters, reverse the strings.
Input: ['cat', 'catatatatctsa', 'abcdefhijklmnop', '124259239185125', '', 'foo', 'unique'] Output: ['CAT', 'CATATATATCTSA', 'ABCDEFHIJKLMNOP', '521581932952421', '', 'FOO', 'UNIQUE'] Input: ['Green', 'Red', 'Orange', 'Yellow', '', 'White'] Output: ['gREEN', 'rED', 'oRANGE', 'yELLOW', '', 'wHITE'] Input: ['Hello', '[email protected]#', '[email protected]#$', '123#@!'] Output: ['hELLO', '[email protected]#', '[email protected]#$', '123#@!']
Pictorial Presentation:
Sample Solution:
Python Code:
#License: https://bit.ly/3oLErEI
def test(strs):
return [s[::-1] if s.isdigit() else s.swapcase() for s in strs]
strs = ['cat', 'catatatatctsa', 'abcdefhijklmnop', '124259239185125', '', 'foo', 'unique']
print("Original list:")
print(strs)
print("Reverse the case of all strings. For those strings which contain no letters, reverse the strings:")
print(test(strs))
strs = ['Green', 'Red', 'Orange', 'Yellow', '', 'White']
print("\nOriginal list:")
print(strs)
print("Reverse the case of all strings. For those strings which contain no letters, reverse the strings:")
print(test(strs))
strs = ["Hello", "[email protected]#", "[email protected]#$", "123#@!"]
print("\nOriginal list:")
print(strs)
print("Reverse the case of all strings. For those strings which contain no letters, reverse the strings:")
print(test(strs))
Sample Output:
Original list: ['cat', 'catatatatctsa', 'abcdefhijklmnop', '124259239185125', '', 'foo', 'unique'] Reverse the case of all strings. For those strings which contain no letters, reverse the strings: ['CAT', 'CATATATATCTSA', 'ABCDEFHIJKLMNOP', '521581932952421', '', 'FOO', 'UNIQUE'] Original list: ['Green', 'Red', 'Orange', 'Yellow', '', 'White'] Reverse the case of all strings. For those strings which contain no letters, reverse the strings: ['gREEN', 'rED', 'oRANGE', 'yELLOW', '', 'wHITE'] Original list: ['Hello', '[email protected]#', '[email protected]#$', '123#@!'] Reverse the case of all strings. For those strings which contain no letters, reverse the strings: ['hELLO', '[email protected]#', '[email protected]#$', '123#@!']
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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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