Do you know about the SLICING technique that helps you work around strings in Python??
To handle sub-strings, you can use the SLICING method.
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To handle sub-strings, you can use the SLICING method.
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Let's say we have a string.
a = "This is a string."
You can slice between the string!
π a[start_index : end_index : stride]
Terms:-
start_index -> Takes an integer value; this is the index value (inclusive) from where you want to start slicing.
a = "This is a string."
You can slice between the string!
π a[start_index : end_index : stride]
Terms:-
start_index -> Takes an integer value; this is the index value (inclusive) from where you want to start slicing.
end_index -> Takes an integer value; this is the index value (exclusive) where you want the slicing to end.
stride -> Takes an integer value; indicates how many characters to skip after the first character is retrieved.
Note: The first character index is always 0.
stride -> Takes an integer value; indicates how many characters to skip after the first character is retrieved.
Note: The first character index is always 0.
Taking the same string, a = "This is a string.", here are a few examples:-
1. Print "is a" from the string
-> a[5 : 9]
2. Print the entire string by skipping 2 characters
-> a[: : 2]
O/P: 'Ti sasrn.'
1. Print "is a" from the string
-> a[5 : 9]
2. Print the entire string by skipping 2 characters
-> a[: : 2]
O/P: 'Ti sasrn.'
An explanation for the 2nd example:-
When we don't mention the start_index and end_index, slicing automatically starts from the first character at index 0 and continues till the end of the string.
Note that: We have to provide at least one value for slicing to occur.
When we don't mention the start_index and end_index, slicing automatically starts from the first character at index 0 and continues till the end of the string.
Note that: We have to provide at least one value for slicing to occur.
3. End the slicing at index 9 and move characters by 2
-> a[: 10 : 2]
Since we want to include the 9th index, we end slicing at the 10th index, as the 10th index is not included.
π NEGATIVE INDEXING
4. Print the string backwards
-> a[: : -1]
O/P: '.gnirts a si sihT'
-> a[: 10 : 2]
Since we want to include the 9th index, we end slicing at the 10th index, as the 10th index is not included.
π NEGATIVE INDEXING
4. Print the string backwards
-> a[: : -1]
O/P: '.gnirts a si sihT'
An explanation for the 4th example:-
When stride is -1, the string moves backwards from the end.
5. What would be the output of a[-7 : -2] ??
The last character is at index -1.
When stride is -1, the string moves backwards from the end.
5. What would be the output of a[-7 : -2] ??
The last character is at index -1.
An explanation for 5th example:-
So, at -7, we have the 's' from 'strings', and the string would end at -2, where 'n' is present.
-2 is inclusive because the starting index from the end is -1.
Therefore, the output is: 'strin'
So, at -7, we have the 's' from 'strings', and the string would end at -2, where 'n' is present.
-2 is inclusive because the starting index from the end is -1.
Therefore, the output is: 'strin'
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