# CS 1358 Introduction to Programming in Python SC3

###### tags: `pythonSC`

# 1. Definitions and Short Answers - functions

1. When you call the function ord('A') it returns 65. What does it mean?
> return the ASCII value of 'A'
2. What is the value of chr(70)? (based on the knowledge of the previous question)
> return '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 是 ASCII的延伸，所以有包含所有的ASCII
4. How is newline (also known as a line feed) represented as a string literal? In other words, how do you print a newline?
>'\n'
5. What is a carriage return? What is its string literal, and what effect does it have when printed?
>move cursor to beginning of this line, '\r'
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
9. Give an example of a floating point literal
>12.0
10. What is the difference between print(hello) and print("hello")?
>print(hello) : print the value of the variable name hello
>print('hello') : print the literal of 'hello'
11. What is a numeral? What is the difference between a numeral and a number?
>number : the numeric quantity
>numeral : a (general) notation for numbers
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?
>0o12
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
    0b0101 | 0b1100
    0b0101 ^ 0b1100
    ~0b0011
    0b1011 << 2
    0b1011 >> 2

write your answers as binary literals

    '0b0100'
    '0b1101'
    '0b1001'
    '-0b100'
    '0b101100'
    '0b0010'

17. What are two possible values of the bool class?
>True, 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(' ')       #Truw
    bool("")        #False
    bool('''''')    #False
    bool("""""")    #False
    bool('""')      #True
    bool("''")      #True

20. What is the value of

    20 or False         #20
    20 and False        #False
    False and 20        #False
    False or 20         #20
    [ ] or 20           #20
    [ ] and 20          #False
    20 or [ ]           #20
    20 and [ ]          #False
    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                 #True
    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'           #True
    '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