+
−Objective Questions
+
−-------------------
+
−
+
− 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.')
+
−