---
tags: Python
---
# Python Self-Check 3
CS 1358 Introduction to Programming in Python
Fall Semester 2022
Prof. Pai H. Chou

Self-Check 3
Due Date: --

Answer the following questions to check your understanding of your material. Expect the
same kind of questions to show up on your tests. For this course, we use vi and vim
interchangeably.

## 1. Definitions and Short Answers
1. When you call the function ord('A') it returns 65. What does it mean?

65 is ASCII code of A

2. What is the value of chr(70)? (based on the knowledge of the previous question)

'F'

3. What is the difference between ASCII character set and Unicode? If a character is in ASCII, is it also in Unicode? Are there characters in Unicode that are not in ASCII?

Unicode includes ASCII and extend character

4. How is newline (also known as a line feed) represented as a string literal? In other words, how do you print a newline?

print('\n')

5. What is a carriage return? What is its string literal, and what effect does it have when printed?

carriage return:move cursor to beginning of this line
'/r'
move cursor to beginning of this line

6. From the command line, what keys do you type to kill a running Python program?

Ctrl-C

7. Give an example of a string literal for McDonald's

'McDonald\'s'

8. Give an example of an integer literal

12 0x12

9. Give an example of a floating point literal

3.12312

10. What is the difference between print(hello) and print("hello")?

print(hello) is to print the value of variable hello
print("hello") only print hello 

11. What is a numeral? What is the difference between a numeral and a number?

numeral is a notation for numbers
number is the numeric quantity

12. What is the value of the integer literal 0b101? Express your answer in base-10 or in English.

5

13. What is the octal literal for the integer value 10?

12

14. What is the value of the integer literal 0x12? Express your answer in base-10 or in English.

18

15. What is the return value of

int('20')     //20
int('0x20')   //32 
oct(16)       //0o20
bin(16)       //0b10000

16. What is the value of

0b0101 & 0b1100   //4
0b0101 | 0b1100   //13
0b0101 ^ 0b1100   //9
~0b0011           //-4
0b1011 << 2       //44
0b1011 >> 2       //2

17. What are two possible values of the bool class?

True and False 

18. What is the value of

True and False    //False
True or False     //True
True and True     //True
True or False     //True
False and False   //False
False or False    //False

19. What is the value of

bool(20)        //True
bool(0)         //False
bool(None)      //False
bool([ ])       //False
bool([])        //False
bool(0.0)       //False
bool('0')       //True
bool('hello')   //True
bool('zero')    //True
bool('')        //False
bool(' ')       //True
bool("")        //False
bool('''''')    //False
bool("""""")    //False
bool('""')      //True
bool("''")      //True

20. What is the value of

**A and B // if A is false return B
**A or B // if A is true return A

20 or False    //20
20 and False   //False
False and 20   //False
False or 20    //20
[ ] or 20      //20
[ ] and 20     //[]
20 or [ ]      //20
20 and [ ]     //[]
30 or 20       //30
20 or 30       //20

21. Assume x = 3 and y = 2, what is the value of

x == 3 and y > 2    //False
x <= 3 and y >= 2   //True
x != 3 or y >= 2    //True
x != 3 and y == 2   //False
x >= 3 >= y > 2     //**False 
//(x >= 3 >= y > 2) equals (x >= 3) and (3 >= y) and (y > 2)
x >= 3 > y >= 2     //**True 
//(x >= 3 > y >= 2) equal (x >= 3) and (3 > y) and (y >= 2)
not (x != 3) and not (y < 2) //True

22. What is the value of

"hello" > "Hello"         //True
'hello' > 'world'         //False
'hello' == 'HELLO'        //False
'hello' == 'he11o'        //False
'2000' == '2OOO'          //False
'Abacus' < 'abacus'       //True
'about' < 'abnormal'      //False
'I' == '|'                //False
'ZOO' != '200'            //True
'uber' == 'über'          //False
'naive' == 'naïve'        //False
'Dijkstra' == 'Dijkstra'   //False

23. What is the meaning of lexicographical order?

"dictionary order", but case sensitive

24. What is the data type of 2+3j? What is the meaning of 3j?

complex number
imaginary components