Python slicing...the number scaling way!!!

Here is a more professional rephrasing of the given sentences:

?There are two methods of slicing:

• ?Forward Slicing: It involves moving from left to right through the data elements.
• Backward Slicing: It involves moving from left to right through the data elements.

In Python, the numbering scale starts from 0 when counting from the left(Forward slicing), whereas it starts from -1 when counting from the right(Backward Slicing). Therefore, in the string "MUKESH KUMAR," the letter "M" is at the 0th position, and "R" is at the 11th position when counted from the left. However, when counted from the right, "M" is at the -12th position and "R" is at the -1st position.

?When performing slicing operations, it is important to set the upper bound as the desired index plus one.

?For example, consider a variable named "name" with the value "MUKESH KUMAR":

• ?To slice the letters "UM," you can use the code "name[7:9]". Here, the upper bound is 8+1=9.
• If you want to retrieve alternate elements, you can use either "name[::2]" or "name[0:12:2]"; both will yield the same output.
• ?To reverse the letters, you can use the code "name[::-1]".

?Let's examine how reverse indexing works:

• ?If you want to extract "KU," you can use the code "name[-5:-3]". The upper bound+1 is -4+1=-3.
• If you want to reverse the elements, you can use the code "name[-1:-13:-1]".

?Now, let's delve deeper into these concepts.

?The third number in the slicing notation "[-1:-13:-1]," which is -1 in this case, is called the "jump."

?You can put any number to jump as per your requirement.

?For instance, if you use the code "name[2:5:1]," the output will be 'KES.' However, if you use the code "name[2:5:-1]," the output will be none.

?To gain a better understanding, consider the number system.

?In the scenario where you are trying to retrieve data from the 2nd to the 5th index (positive side), but the jump is in the negative direction (i.e., -1), an ambiguity arises, resulting in no output.

?Similarly, in the case of "name[-3:-5:1]," you are trying to move in the negative direction but jumping in the positive direction. Consequently, the output is none.

?Try these concepts for yourself; it is fun…!!!

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