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+++ b/parsing_data/questions.rst Thu Oct 07 14:40:21 2010 +0530
@@ -0,0 +1,102 @@
+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.')
+