How to get index of element in string python
In this tutorial, we will learn about the Python index() method with the help of examples. Show
The Example
index() SyntaxIt's syntax is: str.index(sub[, start[, end]] ) index() ParametersThe
index() Return Value
The The only difference is that find() method returns -1 if the substring is not found, whereas Example 1: index() With Substring argument Only
Output Substring 'is fun': 19 Traceback (most recent call last): File " Note: Index in Python starts from 0 and not 1. So the occurrence is 19 and not 20. Example 2: index() With start and end Arguments
Output 15 17 Traceback (most recent call last): File " How can I get the position of a character inside a string in Python?
bad_coder 9,12919 gold badges37 silver badges60 bronze badges asked Feb 19, 2010 at 6:32
0
There are two string methods for this, Using find()
Using index()
From the Python manual
And:
Tomerikoo 16.5k15 gold badges37 silver badges54 bronze badges answered Feb 19, 2010 at 6:35
Eli BenderskyEli Bendersky 252k87 gold badges343 silver badges406 bronze badges 1 Just for a sake of completeness, if you need to find all positions of a character in a string, you can do the following:
which will print:
Jolbas 7375 silver badges15 bronze badges answered Sep 26, 2015 at 7:59
Salvador DaliSalvador Dali 203k142 gold badges684 silver badges744 bronze badges 4
"Long winded" way
to get substring,
answered Feb 19, 2010 at 6:36
ghostdog74ghostdog74 313k55 gold badges252 silver badges339 bronze badges 4 Just for completion, in the case I want to find the extension in a file name in order to check it, I need to find the last '.', in this case use rfind:
in my case, I use the following, which works whatever the complete file name is:
answered Sep 28, 2017 at 6:37
A.JolyA.Joly 2,1072 gold badges17 silver badges23 bronze badges 1 What happens when the string contains a duplicate character? from
my experience with For example:
would return:
In that case you can do something like that:
answered Jul 1, 2015 at 12:40
DimSarakDimSarak 4422 gold badges5 silver badges11 bronze badges 1
Perhaps you'd like to have a look at the documentation to find out what the difference between the two is.
Brad Koch 18.2k18 gold badges107 silver badges135 bronze badges answered Feb 19, 2010 at 6:37
John MachinJohn Machin 79.3k11 gold badges137 silver badges182 bronze badges 1 A character might appear multiple times in a string. For example in a string
answered Sep 16, 2018 at 9:33
itssubasitssubas 1622 silver badges11 bronze badges If you want to find the first match.Python has a in-built string method that does the work: index().
Where:
If you want to find all the matches.Let's say you need all the indexes where the character The pythonic way would be to use
Or even better with a list comprehension:
answered Jan 26, 2021 at 5:01
Guzman OjeroGuzman Ojero 2,02018 silver badges18 bronze badges
Here we find all index locations of the letter Given
Code
answered Feb 9, 2018 at 0:46
pylangpylang 36k11 gold badges119 silver badges110 bronze badges A solution with numpy for quick access to all indexes:
answered Jan 15, 2020 at 20:40
SebSeb 3024 silver badges6 bronze badges 2 Most methods I found refer to finding the first substring in a string. To find all the substrings, you need to work around. For example: Define the stringvars = 'iloveyoutosimidaandilikeyou' Define the substring
Define a function that can find the location for all the substrings within the string
Emi OB 2,3433 gold badges10 silver badges24 bronze badges answered Nov 5, 2021 at 8:44
Not the answer you're looking for? Browse other questions tagged python string or ask your own question.How do you get an index of an element in a string Python?5 Ways to Find the Index of a Substring in Strings in Python. str.find(). str.rfind(). str.index(). str.rindex(). re.search(). How do you get an index from a string?The indexOf() method returns the position of the first occurrence of specified character(s) in a string. Tip: Use the lastIndexOf method to return the position of the last occurrence of specified character(s) in a string.
How do you find the index of an element in a string in Python from the last?The rfind() method finds the last occurrence of the specified value. The rfind() method returns -1 if the value is not found. The rfind() method is almost the same as the rindex() method.
How do you get the position of a character in a string in Python?Method 1: Get the position of a character in Python using rfind() Python String rfind() method returns the highest index of the substring if found in the given string. If not found then it returns -1.
|