Consider the following Python statement: F = open('CONTENT.TXT')} Which of the following is an invalid statement in Python?

Write a user-defined function in Python named showInLines() which reads contents of a text file named STORY.TXT and displays every sentence in a separate line. Assume that a sentence ends with a full stop (.), a question mark (?), or an exclamation mark (!). Example:
If the content of the file STORY.TXT is:


    Our parents told us that we must eat vegetables to be healthy. And it turns out, our parents were right! So, what else did our parents tell?

Then the function should display:


    Our parents told us that we must eat vegetables to be healthy.

    And it turns out, our parents were right!

    So, what else did our parents tell?

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Predict the output of the following code:

def callon(b=20, a=10):
    b = b + a
    a = b - a
    print(b, "#", a)
    return b

x = 100
y = 200
x = callon(x, y)
print(x, "@", y)
y = callon(y)
print(x, "@", y)

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A tuple named subject stores the names of different subjects. Write the Python commands to convert the given tuple to a list and thereafter delete the last element of the list.

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Write a user-defined function in Python named showGrades(S) which takes the dictionary S as an argument. The dictionary S contains Name: [Eng, Math, Science] as key:value pairs.
The function displays the corresponding grade obtained by the students according to the following grading rules:

\[ \begin{array}{|c|c|} \hline \textbf{Average of Eng, Math, Science} & \textbf{Grade} \\ \hline \geq 90 & A \\ \hline < 90 \text{ but } \geq 60 & B \\ \hline < 60 & C \\ \hline \end{array} \]

Example: Consider the following dictionary: \[ S = \{\text{"AMIT"}: [92, 86, 64], \text{"NAGMA"}: [65, 42, 43], \text{"DAVID"}: [92, 90, 88]\} \] The output should be: \[ \text{AMIT} - B \\ \text{NAGMA} - C \\ \text{DAVID} - A \]

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Expand the following terms:
XML, PPP Give one difference between circuit switching and packet switching.

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