Python | Find position of a character in given string

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

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# Python3 code to demonstrate
# to find the first position of the character
# in a given string
  
# Initialising 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 charater available in string")
else:
    print ("Character {} is present at {}".format(c, str(res)))

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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.

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# Python3 code to demonstrate
# to find first position of character
# in a given string
  
# Initialising 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 charater 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 charater available in string {}".format(
                                               ini_string2))
else:
    print ("Character {} in string {} is present at {}".format(
                                c, ini_string2, str(res2 + 1)))

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Output:

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

 
Method #3: Using index()

This Method raises ValueError in case if character not present

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# Python3 code to demonstrate
# to find first position of character
# in a given string
  
# Initialising 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 charater available in string {}".format(ini_string1))

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Output:

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


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