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Homework 1 Calculations and Strings
Homework 1 Calculations and Strings
Part 1: Framed Box
In this part, we will solve a framing problem similar to Lab 2. Write a program that asks the user for the width and height of a framed box, and the character to use in the frame. Then, display a box of the given size, framed by the given character. Also, display the dimensions of the box inside the second line of the box (just after the left frame and a space). Assume that the user inputs valid values for each input: width is a positive integer (7 or higher) and height is a positive integer (4 or higher), and a single character is given for the frame. Here is an expected output of your program (how it will look on the homework submission server):
Width of box == 7 Height of box == 4 Enter frame character == @
Box: @@@@@@@ @ 7x4 @ @ @ @@@@@@@
Here is another possible output:
Width of box == 12 Height of box == 8 Enter frame character == #
Box: ############ # 12x8 # # # # # # # # # # # ############
This is in essence very similar to the lab, except that you will need to put the box dimensions in a string first, and then use its length to figure out how long the second line should be. When you have tested your code, please submit it as hw1_part1.py.
Part 2: Madlibs
In this part you will write code to construct a madlib given below:
Look, <proper name ... I can see you're really <emotion about this ... I honestly think you ought to <verb calmly ...
take a <adjective <noun and think things over ... I know I've made some very <adjective decisions recently, but I can give you my complete <noun that my work will be back to <adjective.
You will ask the missing pieces of the following madlib to the user using the (raw_input) function we learnt in class on thursday. For each input, you will ask the specific type of word required. You will then take all the user specified inputs, and construct the above madlib. You can use any string method we have learnt. Make sure your output looks like the above paragraph, except that the missing information is filled in with the user input. Here is an example run of the program (how it will look at the homework submission server):
proper name == Brad emotion == happy verb == eat adjective == silly noun == mouse adjective == hungry noun == computer adjective == cute
Here is your output: Look, Brad ... I can see you're really happy about this ... I honestly think you ought to eat calmly ... take a silly mouse and think things over ... I know I've made some very hungry decisions recently, but I can give you my complete computer that my work will be back to cute.
When you have tested your code and sure that it works, please submit it as hw1_part2.py.
Part 3: Name popularity
How popular were different names in different decades? Which names have increased or decreased in popularity? We can actually find out thanks to the various real data sets available these days. This homework will be based on real data, but we only ask you to read the numbers for one name using raw_input(). Write a program that reads the number of babies born with a specific name in decades: 1970, 1980, 1990 and 2000. You must then print the information using a table like the one below. Then, compute the percent change in popularity between each consecutive decade. Print this information and the average percent difference. You will need to use formatted strings for this to look correct. If you want to print percent sign % in a formatted string, you need to escape it by writing it twice. Here is an example:
print "The decrease: %% %.2f" %(12.345678) The decrease: % 12.35
Here is an example output of the program for name Anya (how it will look on the homework submission server):
Please enter a name == Anya Count in 1970 = 520 Count in 1980 = 1326 Count in 1990 = 1495 Count in 2000 = 6875
Babies named Anya *****************
Year / Total / % change from previous decade 1970 / 520 1980 / 1326 / % 155.00 1990 / 1495 / % 12.75 2000 / 6875 / % 359.87 Average change: % 175.87
How are the above percentage values computed? Let us look the first value: 155 = 100*(1326-520)/520 Basically, in 1980s, there was an increase of 1326-520=806 for this name. How big is this value compared to the original 520? We find this by computing 100*806/520. Note that for this part, we are not trying to produce a very polished output and we will not align columns in the table for decades. We simply have a single space and slash (/) after each value. Assume no zero values for any decade (so you will not get division by zero errors). This is a relatively long program, but it is also repetitive. Let us try to employ the principle of iterative programming to solve it.
• First, write a program to read one input and print it. What is a good name for your variable? • Now, add another line to read the next input, print it. Also, compute the percentage change from the previous one. Print this as well. • Look at formatting. How do you print only two digits after comma? How do you print the percent sign? Fix it. • Now, worry about reading the name and print it. Also figure out how many stars to print in the next line. How many are needed, given the length of the name? • Now, add all the percentage values and divide by three to find the average. Display this value. • You are not done yet! Don’t forget an important part. TESTING! Test with some simple values: 1,2,4,8 and 1,2,6,24 (and decreasing values as well). What do you expect to see? Do you match? Now, try some more challenging values.
When you have tested your code, please submit it as hw1_part3.py.
Part 1: Framed Box
In this part, we will solve a framing problem similar to Lab 2. Write a program that asks the user for the width and height of a framed box, and the character to use in the frame. Then, display a box of the given size, framed by the given character. Also, display the dimensions of the box inside the second line of the box (just after the left frame and a space). Assume that the user inputs valid values for each input: width is a positive integer (7 or higher) and height is a positive integer (4 or higher), and a single character is given for the frame. Here is an expected output of your program (how it will look on the homework submission server):
Width of box == 7 Height of box == 4 Enter frame character == @
Box: @@@@@@@ @ 7x4 @ @ @ @@@@@@@
Here is another possible output:
Width of box == 12 Height of box == 8 Enter frame character == #
Box: ############ # 12x8 # # # # # # # # # # # ############
This is in essence very similar to the lab, except that you will need to put the box dimensions in a string first, and then use its length to figure out how long the second line should be. When you have tested your code, please submit it as hw1_part1.py.
Part 2: Madlibs
In this part you will write code to construct a madlib given below:
Look, <proper name ... I can see you're really <emotion about this ... I honestly think you ought to <verb calmly ...
take a <adjective <noun and think things over ... I know I've made some very <adjective decisions recently, but I can give you my complete <noun that my work will be back to <adjective.
You will ask the missing pieces of the following madlib to the user using the (raw_input) function we learnt in class on thursday. For each input, you will ask the specific type of word required. You will then take all the user specified inputs, and construct the above madlib. You can use any string method we have learnt. Make sure your output looks like the above paragraph, except that the missing information is filled in with the user input. Here is an example run of the program (how it will look at the homework submission server):
proper name == Brad emotion == happy verb == eat adjective == silly noun == mouse adjective == hungry noun == computer adjective == cute
Here is your output: Look, Brad ... I can see you're really happy about this ... I honestly think you ought to eat calmly ... take a silly mouse and think things over ... I know I've made some very hungry decisions recently, but I can give you my complete computer that my work will be back to cute.
When you have tested your code and sure that it works, please submit it as hw1_part2.py.
Part 3: Name popularity
How popular were different names in different decades? Which names have increased or decreased in popularity? We can actually find out thanks to the various real data sets available these days. This homework will be based on real data, but we only ask you to read the numbers for one name using raw_input(). Write a program that reads the number of babies born with a specific name in decades: 1970, 1980, 1990 and 2000. You must then print the information using a table like the one below. Then, compute the percent change in popularity between each consecutive decade. Print this information and the average percent difference. You will need to use formatted strings for this to look correct. If you want to print percent sign % in a formatted string, you need to escape it by writing it twice. Here is an example:
print "The decrease: %% %.2f" %(12.345678) The decrease: % 12.35
Here is an example output of the program for name Anya (how it will look on the homework submission server):
Please enter a name == Anya Count in 1970 = 520 Count in 1980 = 1326 Count in 1990 = 1495 Count in 2000 = 6875
Babies named Anya *****************
Year / Total / % change from previous decade 1970 / 520 1980 / 1326 / % 155.00 1990 / 1495 / % 12.75 2000 / 6875 / % 359.87 Average change: % 175.87
How are the above percentage values computed? Let us look the first value: 155 = 100*(1326-520)/520 Basically, in 1980s, there was an increase of 1326-520=806 for this name. How big is this value compared to the original 520? We find this by computing 100*806/520. Note that for this part, we are not trying to produce a very polished output and we will not align columns in the table for decades. We simply have a single space and slash (/) after each value. Assume no zero values for any decade (so you will not get division by zero errors). This is a relatively long program, but it is also repetitive. Let us try to employ the principle of iterative programming to solve it.
• First, write a program to read one input and print it. What is a good name for your variable? • Now, add another line to read the next input, print it. Also, compute the percentage change from the previous one. Print this as well. • Look at formatting. How do you print only two digits after comma? How do you print the percent sign? Fix it. • Now, worry about reading the name and print it. Also figure out how many stars to print in the next line. How many are needed, given the length of the name? • Now, add all the percentage values and divide by three to find the average. Display this value. • You are not done yet! Don’t forget an important part. TESTING! Test with some simple values: 1,2,4,8 and 1,2,6,24 (and decreasing values as well). What do you expect to see? Do you match? Now, try some more challenging values.
When you have tested your code, please submit it as hw1_part3.py.
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