Skip to content
Related Articles

Related Articles

Improve Article
Save Article
Like Article

Python | Find position of a character in given string

  • Difficulty Level : Easy
  • Last Updated : 28 Apr, 2021

Given a string and a character, your task is to find the first position of the character in the string. These types of problem are very competitive programming where you need to locate the position of the character in a string.
Let’s discuss a few methods to solve the problem.
Method #1: Using Naive Method 
 

 Attention geek! Strengthen your foundations with the Python Programming Foundation Course and learn the basics.  

To begin with, your interview preparations Enhance your Data Structures concepts with the Python DS Course. And to begin with your Machine Learning Journey, join the Machine Learning - Basic Level Course

Python3




# Python3 code to demonstrate
# to find the first position of the character
# in a given string
 
# Initializing string
ini_string = 'abcdef'
 
# Character to find
c = "b"
# printing initial string and character
print ("initial_string : ", ini_string, "\ncharacter_to_find : ", c)
 
# Using Naive Method
res = None
for i in range(0, len(ini_string)):
    if ini_string[i] == c:
        res = i + 1
        break
     
if res == None:
    print ("No such character available in string")
else:
    print ("Character {} is present at {}".format(c, str(res)))


Output: 

initial_string :  abcdef 
character_to_find :  b
Character b is present at 2

 

  
Method #2: Using find
This method returns -1 in case character not present. 
 



Python3




# Python3 code to demonstrate
# to find first position of character
# in a given string
 
# Initializing string
ini_string = 'abcdef'
ini_string2 = 'xyze'
 
# Character to find
c = "b"
# printing initial string and character
print ("initial_strings : ", ini_string, " ",
        ini_string2, "\ncharacter_to_find : ", c)
 
# Using find Method
res1 = ini_string.find(c)
res2 = ini_string2.find(c)
     
if res1 == -1:
    print ("No such character available in string {}".format(
                                                ini_string))
else:
    print ("Character {} in string {} is present at {}".format(
                                 c, ini_string, str(res1 + 1)))
     
if res2 == -1:
    print ("No such character available in string {}".format(
                                               ini_string2))
else:
    print ("Character {} in string {} is present at {}".format(
                                c, ini_string2, str(res2 + 1)))


Output:

initial_strings :  abcdef   xyze  
character_to_find :  b
Character b in string abcdef is present at 2
No such character available in string xyze

  
Method #3: Using index()
This Method raises Value Error in case if character not present 
 

Python3




# Python3 code to demonstrate
# to find first position of character
# in a given string
 
# Initializing string
ini_string1 = 'xyze'
 
# Character to find
c = "b"
# printing initial string and character
print ("initial_strings : ", ini_string1,
             "\ncharacter_to_find : ", c)
 
# Using index Method
try:
    res = ini_string1.index(c)
    print ("Character {} in string {} is present at {}".format(
                                  c, ini_string1, str(res + 1)))
except ValueError as e:
    print ("No such character available in string {}".format(ini_string1))


Output:

initial_strings :  xyze  
character_to_find :  b
No such character available in string xyze



My Personal Notes arrow_drop_up
Recommended Articles
Page :

Start Your Coding Journey Now!