Count
Python Count method is used to count, How many number of times the sub string is repeated in a specified string. In this article we will show you, How to use Count() method to perform counting in Python Programming with example.
Syntax of a Count Function in Python
The basic syntax of the Count method in Python Programming Language is as shown below:
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String_Value.count(Sub, Start, End) |
- String_Value: Please select the valid String variable or you can use the String directly.
- Sub: This argument is required. Count method will look for this sub string inside the String_Value and if it finds then it will return the count value.
- Start: You can specify the starting value here. For example, if you want to count from middle of a string or at particular index, you can specify here.
- End: You can specify the end value here. For example, if you want to count up to middle of a string or up to particular index, you can specify here.
Return Value
Python Partition function will return integer value. For example, If we say, ‘Hell World’.count(‘l’, 0, 7) then count function will start looking for l inside the ‘Hello World’ and return 2 because the index position of end value is 7 (i., r)
Python Count method Example
The following set of examples will help you understand the count Function in Python Programming Language.
PYTHON CODE
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# Python Count Method Example Str1 = 'learn Python at tutorial gateway' Str2 = 'a' Str3 = Str1.count(Str2) print("Total Number of a's in String1 = ", Str3) Str4 = Str1.count(Str2, 6, 25) print("Total Number of a's in Sliced String1 = ", Str4) Str5 = Str1.count(Str2, 6, len(Str1)) print("Total Number of a's in Sliced String1 = ", Str5) # Performing Count function directly Str6 = 'learn Python at tutorial gateway'.count('a', 0, 60) print("Total Number of a's in String1 = ", Str6) |
OUTPUT
ANALYSIS
First we declared three String variable Str1, Str2 and assigned corresponding value using following statement
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Str1 = 'learn Python at tutorial gateway' Str2 = 'a' |
Following statement will count the number of times ‘a’ is repeated in Str1 string and prints the output.
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Str3 = Str1.count(Str2) print("Total Number of a's in String1 = ", Str3) |
Following statement will slice the string Str1 starting at 6 and up to 25. Within the sliced string, python will count the number of times ‘a’ is repeated and prints the output.
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Str4 = Str1.count(Str2, 6, 25) print("Total Number of a's in Sliced String1 = ", Str4) |
Following statement will slice the string Str1 starting at 6 and up to End (In order to find the end value we used the python Len function). Within the sliced string, python will count the number of times ‘a’ is repeated and prints the output.
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Str5 = Str1.count(Str2, 6, len(Str1)) print("Total Number of a's in Sliced String1 = ", Str5) |
Below statement we used the Count function directly on String
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Str6 = 'learn Python at tutorial gateway'.count('a', 0, 60) print("Total Number of a's in String1 = ", Str6) |
Python Count method Alternative 2
In the interview perspective, they may ask you to display the letter Count without using built-in count method. In this example we are going to use for loop to iterate the characters present in String
PYTHON CODE
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Str1 = 'learn Python at tutorial gateway' Str2 = 'a' count = 0 for char in Str1: if char == Str2: count = count + 1 print("Total Number of a's in String1 = ", count) |
OUTPUT
ANALYSIS
First, We used For Loop to iterate the characters present in Str1 String
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for char in Str1: |
Within the for loop we used If Statement to check whether each of the string character is equal to Str2 or not and if it is True then Count value will be incremented by 1
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if char == Str2: count = count + 1 |
Last print statement will be used to print the Output
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print("Total Number of a's in String1 = ", count) |
Python Count method Alternative 2
The following example is another alternative method to the String Count function in Python Programming Language.
PYTHON CODE
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from collections import Counter Str1 = 'learn Python at tutorial gateway' Str2 = 'a' count = Counter(Str1)[Str2] print("Total Number of a's in String1 = ", count) |
OUTPUT
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