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As per the name suggests, the count() string method is used to count the total number of occurrence of a specific value in the invoked string.

Signature of count() method

count(value, start, end)

Parameters	Description
value	This is a string value, which is searched for the number of occurrences in the invoked string and its total search count is returned. A non-optional attribute.
start	This is an integer value to specify the index position(zero-based index) to start the search at. An optional attribute.
end	An integer value to specify the index position(one-based index) to end the search at. An optional attribute.

• An example of count() method


In the upcoming code, we have a string object initialized to a value Hello World and we are going to check whether this string object has specific string values, if yes then how many? Let us see the example.



# Python - Example of count() method.



# Creating a string 
s1 = 'Rock and Roll'


# Printing the value of string 
print('String is : ', s1)


# Checking the count of value 'Roll' in the string 
count1 = s1.count('Roll')

print('Count of Roll in ', s1, ' : ', count1)


# Checking the count of value 'o' in the string 
count2 = s1.count('o')

print('Count of o in ', s1, ' : ', count2)


# Checking the count of value 'l' in the string 
count3 = s1.count('l')

print('Count of l in ', s1, ' : ', count3)





Output is :




String is :  Rock and Roll
Count of Roll in  Rock and Roll  :  1
Count of o in  Rock and Roll  :  2
Count of l in  Rock and Roll  :  2





Program Analysis


In the above program, we have created a string object with value Rock and Roll.
• In the first call to count() method, it looks for the occurrences of value Roll in the invoked string and returns 1.
• In the second call to count() method, it looks for the occurrences of value o in the invoked string and returns 2.
• In the first call to count() method, it looks for the occurrences of value l in the invoked string and returns 2.







• Method count() is case-sensitive.


When searching for the count of a specific value, the method count() performs a case-sensitive search.



# Python - Example of count() method.



# Creating a string 
s1 = 'LIVE and let live'


# Printing the value of string 
print('String is : ', s1)


# Checking the count of lower case value 'l' in the string 
count1 = s1.count('l')

print('Count of l in ', s1, ' : ', count1)


# Checking the count of upper case value 'L' in the string 
count2 = s1.count('L')

print('Count of L in ', s1, ' : ', count2)


# Checking the count of lower case value 'e' in the string 
count3 = s1.count('e')

print('Count of e in ', s1, ' : ', count3)





Output is :




String is :  LIVE and let live
Count of l in  LIVE and let live  :  2
Count of L in  LIVE and let live  :  1
Count of e in  LIVE and let live  :  2





Program Analysis



In the code above, we have a String object initialized to a value LIVE and let live!
• In the first call to count() method, it looks for the occurrences of lower value l in the invoked string and returns 1.
• In the second call to count() method, it looks for the occurrences of upper case value L in the invoked string and returns 2.
• In the first call to count() method, it looks for the occurrences of lower case value e in the invoked string and returns 2.





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• Finding the occurrences of a value in between a specific index.

When calling the count() method, we can even specify the start index(to begin the search at) and the last index(to end the search at), by passing the value of its two optional parameters i.e. start and end.

# Python - Example of count() method.



# Creating a string 
s1 = 'A good heart keeps you beautiful forever!'


# Printing the value of string 
print('String is : ', s1)


# Checking the count of lower case value 'e' in the string
# starting index to search is 0(zero-based index)
# last index to search is 0(one-based index)
count1 = s1.count('e', 0, 10)

print(count1)


# Checking the count of lower case value 'e' in the string
# starting index to search is 10(zero-based index)
# last index to search is 20(one-based index)
count2 = s1.count('e', 10, 20)


print(count2)


# Checking the count of lower case value 'e' in the string
# starting index to search is 10(zero-based index)
# last index to search is 40(one-based index)
count2 = s1.count('e', 10, 40)


print(count2)

Output is :

String is :  A good heart keeps you beautiful forever!
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