Objective Questions

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 1. How do you split the string "Guido;Rossum;Python" to get the words

   Answer: line.split(';')

 2. line.split() and line.split(' ') are same

   a. True

   #. False

   Answer: False

 3. What is the output of the following code::

      line = "Hello;;;World;;"

      sub_strs = line.split()

      print len(sub_strs)

    Answer: 5

 4. What is the output of "      Hello    World    ".strip()

   a. "Hello World"

   #. "Hello     World"

   #. "      Hello World"

   #. "Hello World     "

   Answer: "Hello    World"

 5. What does "It is a cold night".strip("It") produce

    Hint: Read the documentation of strip

   a. "is a cold night"

   #. " is a cold nigh" 

   #. "It is a cold nigh"

   #. "is a cold nigh"

   Answer: " is a cold nigh"

 6. What does int("20") produce

   a. "20"

   #. 20.0

   #. 20

   #. Error

   Answer: 20

 7. What does int("20.0") produce

   a. 20

   #. 20.0

   #. Error

   #. "20"

   Answer: Error

 8. What is the value of float(3/2)

   a. 1.0

   #. 1.5

   #. 1

   #. Error

   Answer: 1.0

 9. what doess float("3/2") produce

   a. 1.0

   #. 1.5

   #. 1

   #. Error

   Answer: Error

 10. See if there is a function available in pylab to calculate the mean

     Hint: Use tab completion

Larger Questions

================

 1. The file ``pos.txt`` contains two columns of data. The first and second

    columns are the x and y co-ordiantes of a particle in motion, respectively.

    Plot the trajectory of the particle.

   Answer::

     x_values = []

     y_values = []

     for line in open("/home/fossee/pos.txt");

         x_str, y_str = line.split()

         x = int(x_str)

         y = int(y_str)

         x_values.append(x)

         y_values.append(y)

         plot(x, y, 'b.')