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- #
- # RWET Programming Exercise B
- #
- # This worksheet is also a Python program. Your task is to read the
- # task descriptions below and then write one or more Python statements to
- # carry out the tasks. There's a Python "print" statement before each
- # task that will display the expected output for that task; you can use
- # this to ensure that your statements are correct.
- #
- print "------"
- print "Task 1: Arithmetic expressions"
- print "Expected output: 7"
- # Task 1: Add parentheses to the Python statement below so that it prints
- # out the number 7.
- print 10 + 4 / 2
- #------------------------------------------------------------------------
- print "\n------"
- print "Task 2: Expressions of inequality"
- print "Expected output: True"
- # Task 2: Change the operator in the statement below so that it displays
- # "True" instead of "False."
- print 14 > 15
- #------------------------------------------------------------------------
- print "\n------"
- print "Task 3: Variable assignment"
- print "Expected output: 32"
- # Task 3: Change the variable assignment below so that the print statement
- # displays "32." (Don't change the print statement!)
- my_number = 17
- print my_number
- #------------------------------------------------------------------------
- print "\n------"
- print "Task 4: Types"
- print "Expected output: <type 'str'>"
- # Task 4: Three variables are assigned below, all with different types.
- # Replace the word "None" inside the parentheses of type() in the print
- # statement below so that it prints "<type 'str'>".
- x = 14
- y = 17.4
- z = "mother said there'd be days like these"
- print type(None)
- #------------------------------------------------------------------------
- print "\n------"
- print "Task 5: String literals"
- print "Expected output: We aren't friends now."
- # Task 5: Modify the print statement below so that it displays the string
- # "We aren't friends now." (i.e., change "are" to "aren't".) Use a
- # single quoted string---don't change it to double quotes.
- print 'We are friends now.'
- #------------------------------------------------------------------------
- print "\n------"
- print "Task 6: Questions about strings"
- print "Expected output: 51"
- # Task 6: After "print" below, write an expression that evaluates to the
- # sum of the lengths of the two string variables defined below (first_line
- # and second_line). Use the len() function.
- first_line = "It was the best of times."
- second_line = "It was the worst of times."
- print # your code here!
- #------------------------------------------------------------------------
- print "\n------"
- print "Task 7: Questions about strings, part 2"
- print "Expected output: 37"
- # Task 7: After "print" below, write an expression that evaluates to the
- # position of the word "window" in the string defined in the variable
- # called "romeo." Use the .find() method.
- romeo = "But, soft! what light through yonder window breaks?"
- print # your code here!
- #------------------------------------------------------------------------
- print "\n------"
- print "Task 8: String transformations"
- print "Expected output: and the horse you rode in on"
- # Task 8: Modify the print statement below so that it prints out the contents
- # of the variable "benediction", but with all white space removed from
- # the beginning and end of the string. Use the .strip() method.
- benediction = " and the horse you rode in on \n"
- print benediction
- #------------------------------------------------------------------------
- print "\n------"
- print "Task 9: String transformations, part 2"
- print "Expected output: AND THE HORSE YOU RODE IN ON"
- # Task 9: Using the previously defined "benediction" variable, write an
- # expression after the word "print" below that evaluates to the content
- # of the string, with all whitespace removed, and with all letters
- # converted to uppercase. Use the .upper() method.
- print # your code here!
- #------------------------------------------------------------------------
- print "\n------"
- print "Task 10: String indexing"
- print "Expected output: p"
- # Task 10: Modify the value assigned to variable "offset" below so that
- # the following "print" statement displays the letter "p".
- offset = 0
- print "apple"[offset]
- #------------------------------------------------------------------------
- print "\n------"
- print "Task 11: String slices"
- print "Expected output: yonder"
- # Task 11: Modify the values assigned to variables "start" and "end"
- # below so that the following "print" statement displays the word "yonder".
- start = 0
- end = 10
- romeo = "But, soft! what light through yonder window breaks?"
- print romeo[start:end]
- #------------------------------------------------------------------------
- print "\n------"
- print "Task 12: Integers and strings"
- print "Expected output: 100"
- # Task 12: Modify the statement below so that it displays the number 100.
- # Do this using the int() function (hint: you need to use it twice).
- print "19" + "81"
- print "\n------"
- print "Task 13: List indexes"
- print "Expected output: alpha"
- # Task 13: A variable "greek" is defined below. The value of this variable
- # is of type list. Change the expression below the variable definition so
- # that it prints "alpha" (instead of "beta").
- greek = ["alpha", "beta", "gamma", "delta", "epsilon"]
- print greek[1]
- #------------------------------------------------------------------------
- print "\n------"
- print "Task 14: List slices"
- print "Expected output: ['beta', 'gamma', 'delta']"
- # Task 14: Change the values of the variables "start" and "finish" below so that
- # the print statement displays the second through fourth items in the list
- # "greek" (defined above).
- start = 0
- finish = 6
- print greek[start:finish]
- #------------------------------------------------------------------------
- print "\n------"
- print "Task 15: List slices, part 2"
- print "Expected output: ['gamma', 'delta']"
- # Task 15: Change the value of the variable "foo" below so that the print
- # statement displays the last two members of the list "greek" (defined above).
- # Use a negative number for "foo".
- foo = 0
- print greek[foo:]
- #------------------------------------------------------------------------
- print "\n------"
- print "Task 16: List operations"
- print "Expected output: True"
- # Task 16: Change the value of the variable "letter_to_look_for' below so
- # that the print statement displays "True."
- letter_to_look_for = "aleph"
- print letter_to_look_for in greek
- #------------------------------------------------------------------------
- print "\n------"
- print "Task 17: List operations, part 2"
- print "Expected output: ['alpha', 'beta', 'delta', 'epsilon', 'gamma']"
- # Task 17: Change the expression below so that the print statement displays
- # the list "greek" (defined above) in alphabetical order. (Use the "sorted"
- # function.
- print greek
- #------------------------------------------------------------------------
- print "\n------"
- print "Task 18: Modifying lists"
- print "Expected output: ['alpha', 'beta', 'gamma', 'delta', 'epsilon', 'zeta']"
- # Task 18: Write a Python statement that adds a new item, "zeta", to the
- # list "greek" (defined above). The print statement should display the updated
- # list.
- # write your statement here
- print greek
- #------------------------------------------------------------------------
- print "\n------"
- print "Task 19: Loops"
- print "Expected output:"
- print " alpha"
- print " beta"
- print " gamma"
- print " delta"
- print " epsilon"
- print " zeta"
- # Task 19: Write a "for" loop below that prints out each item in the list
- # "greek" (defined above). (The list should contain the item that you
- # added to the list in task 6.)
- #------------------------------------------------------------------------
- print "\n------"
- print "Task 20: Loops, part 2"
- print "Expected output:"
- print " Alpha"
- print " Beta"
- print " Gamma"
- print " Delta"
- print " Epsilon"
- print " Zeta"
- # Task 20: Write a "for" loop below that prints out each item in the list
- # "greek" (defined above), but with the first letter of each item capitalized.
- # (The list should contain the item that you added to the list in task 6.)
- #------------------------------------------------------------------------
- print "\n------"
- print "Task 21: Split and join"
- print "Expected output:"
- print " 81"
- print " 9-18-81"
- # Task 21: Modify the variable "separator" below so that the first print
- # statement displays "81". Modify the variable "glue" so that the second print
- # statement displays "9-18-81".
- separator = "?"
- glue = "?"
- parts = "9/18/81".split(separator)
- print parts[-1]
- print glue.join(parts)
- #------------------------------------------------------------------------
- print "\n------"
- print "Task 22: All together now"
- print "Expected output: alpha, beta, gamma, delta, epsilon, zeta, eta, theta"
- # Task 22: Make three changes on the Python code below, as follows: (1) replace
- # [] with an expression that evaluates to a list with two items, "eta" and
- # "theta" (using the .split() method). (2) Replace the word "pass" with a
- # Python statement, so that the "for" loop has the effect of adding two new
- # items to the list "greek". (Use the .append() method.) (3) Change the value
- # of the variable "glue" so that the desired output is displayed.
- new_letters = "eta theta"
- new_letters_list = [] # <-- replace this
- for letter_name in new_letters_list:
- pass # <-- and replace this
- glue = "?" # <-- and replace this
- print glue.join(greek)
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