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Python string supports slicing to create substring. Note that Python string is immutable, slicing creates a new substring from the source string and original string remains unchanged.
Python slice string
Python slice string syntax is:
str_object[start_pos:end_pos:step]
The slicing starts with the start_pos index (included) and ends at end_pos index (excluded). The step parameter is used to specify the steps to take from start to end index. Python String slicing always follows this rule: s[:i] + s[i:] == s for any index ‘i’. All these parameters are optional - start_pos default value is 0, the end_pos default value is the length of string and step default value is 1. Let’s look at some simple examples of string slice function to create substring.
s = 'HelloWorld'
print(s[:])
print(s[::])
Output:
HelloWorld
HelloWorld
Note that since none of the slicing parameters were provided, the substring is equal to the original string. Let’s look at some more examples of slicing a string.
s = 'HelloWorld'
first_five_chars = s[:5]
print(first_five_chars)
third_to_fifth_chars = s[2:5]
print(third_to_fifth_chars)
Output:
Hello
llo
Note that index value starts from 0, so start_pos 2 refers to the third character in the string.
Reverse a String using Slicing
We can reverse a string using slicing by providing the step value as -1.
s = 'HelloWorld'
reverse_str = s[::-1]
print(reverse_str)
Output: dlroWolleH Let’s look at some other examples of using steps and negative index values.
s1 = s[2:8:2]
print(s1)
Output: loo Here the substring contains characters from indexes 2,4 and 6.
s1 = s[8:1:-1]
print(s1)
Output: lroWoll Here the index values are taken from end to start. The substring is made from indexes 1 to 7 from end to start. 
s1 = s[8:1:-2]
print(s1)
Output: lool 
Python slice works with negative indexes too, in that case, the start_pos is excluded and end_pos is included in the substring.
s1 = s[-4:-2]
print(s1)
Output: or 
Python string slicing handles out of range indexes gracefully.
>>>s = 'Python'
>>>s[100:]
''
>>>s[2:50]
'thon'
That’s all for python string slice function to create substring.
You can checkout complete python script and more Python examples from our GitHub Repository.
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About the author
Java and Python Developer for 20+ years, Open Source Enthusiast, Founder of https://www.askpython.com/, https://www.linuxfordevices.com/, and JournalDev.com (acquired by DigitalOcean). Passionate about writing technical articles and sharing knowledge with others. Love Java, Python, Unix and related technologies. Follow my X @PankajWebDev
Still looking for an answer?
Hi Thankx for this section. I need more clarification on s1 = s[8:1:-1] print(s1) Output: lroWoll I am unable to get it .
- sradhanjali behera
Hi I have a doubt: string = “Hi There” print (string[-4:-2]) and the output is ‘he’ but shouldn’t the output be ‘eh’? I am unable to understand why the output is showing he
- Kalpit
For the negative count, the end of the string starts from -1 not 0. It is like -4 -3 -2 -1 not -4 -3 -2 -1 0
- Coder
Your idea about reverse a string using a negative value is completely wrong please update this post. What actually happening here is x = ‘H e l l o w o r l d’ -----0 1 2 3 4 5 6 7 8 9 >>> x[8:1:-1] output – ‘ l r o w o l l ‘ -------8 7 6 5 4 3 2 Usually, the second parameter 1 won’t be taken into consideration right. This means if I enter x[1:8], index 8 won’t be sliced right. Similarly, this happens in x[8:1:-1]. So index 1 won’t be sliced. >>> x[-2:-8:-1] output- ‘lrowol’ Here, -2,-3,-4,-5,-6,-7 indexes will be sliced. Conclusion: string[x:y:p] When p x>y and index y won’t be sliced. That’ it!!!
- Kobinarth Panchalingam
TheData = [20, 3, 4,8,12, 99,4, 26 , 4 ] TheData1= TheData [ 0 : len(TheData) : 1 ] def InsertionData (TheData1): for Count in range(0, len(TheData1)): DataToInsert = TheData1(Count) Inserted = 0 Nextvalue = Count - 1 while (Nextvalue >= 0 and Inserted != 1): if DataToInsert < TheData1(Nextvalue): TheData1(Nextvalue + 1) == TheData1(Nextvalue) Nextvalue = Nextvalue -1 TheData1(Nextvalue +1 ) == DataToInsert else: Inserted = 1 def printarray(TheData1): for count in range(0, len(TheData1)): print(TheData1(count) ) print("Array before sorting \n ") printarray(TheData1) InsertionData(TheData1) print(“Array After sorting \n”) printarray(TheData1) Error: Array before sorting Traceback (most recent call last): File “c:\Users\Admin\Desktop\Paper 4 solution.py”, line 26, in printarray(TheData1) File “c:\Users\Admin\Desktop\Paper 4 solution.py”, line 23, in printarray print(TheData1(count) ) TypeError: ‘list’ object is not callable Anyone help how to done slicing in python
- malik
This work is licensed under a Creative Commons Attribution-NonCommercial- ShareAlike 4.0 International License.- Table of contents
- Python slice string
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