String Slicing in Python
Python slicing is about obtaining a sub-string from the given string by slicing it respectively from start to end.
Python slicing can be done in two ways.
- slice() Constructor
- Extending Indexing
slice() Constructor
The slice() constructor creates a slice object representing the set of indices specified by range(start, stop, step).
Syntax:
- slice(stop)
- slice(start, stop, step)
Parameters:
start: Starting index where the slicing of object starts.
stop: Ending index where the slicing of object stops.
step: It is an optional argument that determines the increment between each index for slicing.Return Type: Returns a sliced object containing elements in the given range only.
Index tracker for positive and negative index:
Negative comes into considers when tracking the string in reverse.
Example
# Python program to demonstrate# string slicing # String slicing String ='ASTRING' # Using slice constructors1 = slice(3)s2 = slice(1, 5, 2) s3 = slice(-1, -12, -2) print("String slicing") print(String[s1]) print(String[s2]) print(String[s3]) |
Output:
String slicing AST SR GITA
Extending indexing
In Python, indexing syntax can be used as a substitute for the slice object. This is an easy and convenient way to slice a string both syntax wise and execution wise.
Syntax
string[start:end:step]
start, end and step have the same mechanism as slice() constructor.
Example
# Python program to demonstrate# string slicing # String slicing String ='ASTRING' # Using indexing sequenceprint(String[:3])print(String[1:5:2])print(String[-1:-12:-2]) # Prints string in reverse print("\nReverse String")print(String[::-1]) |
Output:
AST SR GITA Reverse String GNIRTSA
Last Updated on October 28, 2021 by admin