INQ 241A

Lab 19: Images

Practice Problem 1

Write a function called convert_grade(numeric_grade), which takes an integer in the range $(0, 5)$ . Your function should print the letter grade the user recieved, given the numeric grade:

Numeric Grade	Letter Grade
0	F
1	D
2	C
3	B
4	A

Example

>>> convert_grade(0)
F
>>> convert_grade(1)
D
>>> convert_grade(4)
A

Hint

Practice Problem 2

Write a function called print_factors(x), which prints all of the positive integer factors of $x$ . An integer $y$ is an integer factor of $x$ if the remainder of $\frac{x}{y}$ is 0.

Example

>>> print_factors(1)
1
>>> print_factors(2)
1
2
>>> print_factors(4)
1
2
4

Hint

The remainder operator in Python is $\%$ . $x \% y == 0$ tells you that y evenly divides x.

Write a loop that goes through all of the integers greater than 1, but less than (or equal to) $x$ . See if the above condition is true. If it is true, print the loop variable.

Blurred Images

In a file called blurred_images.py write a function called simple_blur(a_picture). This function should display a blurred version of the image parameter.

To blur an image, you simply average a pixels color value with the 4 pixels surrounding it.

Example

Before

After

Note: This image has actually been blurred 4 times, to make it obvious what is happening. Your image will only be slightly fuzzy.