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