1. CSC1018F: Intermediate Python (Tutorial)
Diving into Python Ch. 4
Think Like a Comp. Scientist Ch. 1-6

2. Mini-Test (1)
The precedence of Python mathematical operators from highest to lowest is:
Parentheses, Addition/Subtraction, Multiplication/Division, Exponentiation
Parentheses, Exponentiation, Multiplication/Division, Addition/Subtraction
Parentheses, Exponentiation, Addition/Subtraction, Multiplication/Division
Always from left to right in the expression
The following sequence of Python statements
>>> minute = 59
>>> minute / 60.0
will return:
a syntax error

3. Mini-Test (2) The python statement: 0 or "" and "weird" will return:
True
False
""
"weird"
Which of the following statements does NOT apply to lambda functions?
Lambda functions require parentheses around the arguments
Lambda functions may take any number of arguments
Lambda functions may contain multiple expressions
The return keyword is implied

4. Mini-Test(3)
Which of the following statements does apply to the getattr built-in function:
gettatr only works on native datatypes
getattr(li, "pop") will execute pop on the list li
getattr can take an optional third argument which is a default value
The value of the arguments passed to getattr must be known at compile time
The Python statement x = "CSC" + str(x) + "F" will:
Be rejected by the Python interpreter
Be accepted by the Python interpreter only if x is an immutable datatype
Be accepted by the Python interpreter only if x is an int, float, dictionary, string, list or tuple
Always be accepted by the Python interpreter

5. Mini-Test (4) Given a function defined as follows:
def opt(first, second = 0, third = {}):
In order to assign 1 to first, 2 to second, and {} to third, you could call opt as:
opt(1, 2)
opt(second = 2, first = 1)
opt(third = {}, 1, 2)
opt(1, 2, {})

6. Tut Q1: Image Thresholding
Assume that an image is represented:
With greyscale pixel values in the range 0 (black) to 255 (white)
As a list of lists of integers
Each sublist represents a row of pixels
Write functions to perform the following operations:
Threshold(image, threshval) - return an image which has all values below threshval converted to 0 and all those equal or above to 255. Threshval should default to 100
Challenge: try and compress the body of the function into a single line

7. Tut Q2: More Image Manipulation
Create image functions to:
CheckValidity(image) - return true if every row of an image is of the same length
Expand(image) - return an image with double the horizontal resolution of the input image created by adding an equal amount of white pixels to left and right of the image. Assume that the horizontal resolution is an even number.