u01-slides-python

Question 1

What is the standard filename suffix for Python files?

Answer 1

.py

Question 2

What version of Python is recommended in the course?

Answer 2

Version ≥ 3.11

Question 3

In what order is Python code executed?

Answer 3

Line by line from first line to last line

Question 4

How are expressions evaluated in Python?

Answer 4

From left to right (e.g. a + b + c is equivalent to (a + b) + c)

Question 5

How are assignments evaluated in Python?

Answer 5

From right to left (e.g. x = a + b is equivalent to x = (a + (b)))

Question 6

What character is used to start a comment in Python?

Answer 6

The hashtag character (#)

Question 7

What is the purpose of comments in Python code?

Answer 7

To document code - they are not executed and have no effect on program behavior

Question 8

What are the main data types covered in the course?

Answer 8

bool (Boolean), int (Integer), float (Float), str (String)

Question 9

What values can a Boolean data type store?

Answer 9

Only two values: False (0) or True (1)

Question 10

What is special about integers in Python?

Answer 10

They are not limited by fixed size (e.g. 32 bits) but are variable-length objects of arbitrary size

Question 11

What is the range for double-precision floats in Python?

Answer 11

Between approximately ±2.2 × 10^-308 and ±1.8 × 10^308

Question 12

What is dynamic typing in Python?

Answer 12

The data type is determined during run time and is associated with the value itself not the variable

Question 13

What are variables in Python?

Answer 13

References or names that are bound to objects - they don’t store information themselves

Question 14

What are the rules for variable names in Python?

Answer 14

Must start with non-digits/non-operators, are case sensitive, conventionally lowercase with underscores

Question 15

How do you get user input from the console in Python?

Answer 15

Using the input() function

Question 16

What is the data type of console input in Python?

Answer 16

String (str) - data type conversion must be done manually if needed

Question 17

What happens when you assign a variable to another variable in Python?

Answer 17

Both variables reference the same object in memory

Question 18

What happens when you reassign a value to a variable in Python?

Answer 18

It creates a new reference to a new object - it doesn’t modify the original object

Question 19

Where can you find Python style recommendations?

Answer 19

https://www.python.org/dev/peps/pep-0008/

Question 20

What is the conventional format for variable names in Python?

Answer 20

Lower case with words separated by underscores (e.g.

Question 21

How do you print output to the console in Python?

Answer 21

Using the print() function

Question 22

Why is code style important in Python?

Answer 22

It helps achieve maintainability, consistency, and helps other programmers understand the code

Question 23

What is an object in Python?

Answer 23

Everything in Python is an object

Question 24

What are some examples of reserved keywords in Python?

Answer 24

if, while, for, def, class