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The next topic is either dating through string we can use a for loop.

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I did it through a string in python.

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Let us take an example.

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So in the Jupiter notebook I have defined a variable E which contains the text happy and then I have

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declined.

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Counted which count numbered all four letter B's in this variable E and then I have used a for loop

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to either read through this variable.

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So this is decent tax for the for loop.

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So the first line means this particular line means that for every character in the variable it checks

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if the character is equal to B and if this is true.

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If this if this statement is true it increment the counter by 1.

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And this for loop gets executed until it reaches the end of the string and then when it comes out of

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the loop.

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Finally the printout the number of four letter B that are found in this variable.

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Happy.

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So let us now execute this code in our Jupiter note book.

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There are six B's that are found in this variable a.