Sample Midterm 1

  1. Which of the following Python identifiers are legal variable names? For those that are not, say why not.
    1. x
    2. Celsius
    3. spam3
    4. <hello>
    5. question?
  2. What is the data type (int, long int, float, string, list) of the following:
    1. 3
    2. 3.0
    3. 3L
    4. "hello"
    5. 'x'
    6. [ 1, 2, 3 ]
  3. Write the following formulas in Python:
    1. convert Fahrenheit to Celsius
    2. 7 × 9
    3. 42
  4. What does the following program print?
    for i in "hello":
        print i, "-->", chr(ord(o)+1);
  5. What does the following program print?
    for i in [1, 7, 4]:
        x = (-1) ** i * i;
        print i, x;
  6. When I ran the following program:
    x = input("Enter a number: ");
    y = 1.0 / x;
    print "The reciprocal of", x, "is", y;
    I got the following error message:
    Traceback (most recent call last):
      File "test.py", line 2, in <module>
        y = 1 / x;
    ZeroDivisionError: integer division or modulo by zero
    What caused the error? Please be specific.