---
tags: Python
---
# Python Self-Check 5
CS 1358 Introduction to Programming in Python
Fall Semester 2022
Prof. Pai H. Chou
Self-Check 1
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. What is the data type of (1, 2, 3)?
```
tuple
```
2. If s = 'ABCDE', what is the value of
```
s[0] //'A'
s[1] //'B'
s[-1] //'E'
s[1:4] //'BCD'
s[-5:-2] //'ABC'
s[:2] //'AB'
s[-3:] //'CDE'
s[:] //'ABCDE'
s[0:0] //''
s[1:4:2] //'BD'
s[-1:0:-1] //'EDCB'
```
3. If S = ['h', 'e', 'l', 'l', 'o'], what is the value of S after executing the statement S[1:2] = ['a']?
```
S = ['h', 'a', 'l', 'l', 'o']
```
4. If T = ('h', 'e', 'l', 'l', 'o'), which of the following is allowed or not allowed and why?
```
T[3] = 'z' //not allowed, tuple is immutable
T = ('w', 'o', 'r', 'l', 'd') //allowed T = ('w', 'o', 'r', 'l', 'd')
T = T[2:-1] //allowed T = ('l', 'l')
```
5. What is the value of
```
list('apple') //['a', 'p', 'p', 'l', 'e']
tuple('apple') //('a', 'p', 'p', 'l', 'e')
set('apple') //{'a', 'p', 'l', 'e'}
```
6. What is the value of
```
str(['a', 'p', 'p', 'l', 'e']) //"['a', 'p', 'p', 'l', 'e']"
str(('a', 'p', 'p', 'l', 'e')) //"('a', 'p', 'p', 'l', 'e')"
str({'a', 'p', 'p', 'l', 'e'}) //"{'a', 'p', 'l', 'e'}"
```
7. What is the result of
```
list(('a', 'p', 'p', 'l', 'e')) //['a', 'p', 'p', 'l', 'e']
tuple(['a', 'p', 'p', 'l', 'e']) //('a', 'p', 'p', 'l', 'e')
set(['a', 'p', 'p', 'l', 'e']) //{'a', 'p', 'l', 'e'}
```
8. What is the result of
```
'Apple' < 'apple' //True
'Apple' <= 'apple' //True
'Apple' == 'apple' //False
'Apple' >= 'apple' //False
'Apple' > 'apple' //False
'Apple' != 'apple' //True
```
9. What is the result of
```
'Apple' < 'adventure' //True
'apple' < 'adventure' //False
'apple' < 'Adventure' //False
'apple' < 'bee' //True
'apple' < 'Bee' //False
'Apple' < 'bee' //True
'Apple' < 'Bee' //True
```
10. What is the result of
```
('apple', 0) < ('apple', 2) //True
('apple', 0, 3) < ('apple', 1) //True
['apple', 2, 2] < ['apple', 2, 1, 5] //False
['apple', 3] < ['oranges', 0] //True
```
11. What is the result of
```
's' in 'school' //True
'hoo' in 'school' //True
'S' in 'school' //False
'ol' in 'school' //True
'k' not in 'school' //True
's' not in 'School' //True
```
12. What is the result of
```
's' in ['s', 'c', 'h', 'o', 'o', 'l'] //True
['s'] in ['s', 'c', 'h', 'o', 'o', 'l'] //False
['s'] in [['s'], ['c'], ['h'], ['o'], ['o'], ['l']] //True
'hoo' in ['s', 'c', 'h', 'o', 'o', 'l'] //False
['h', 'o', 'o'] in ['s', 'c', 'h', 'o', 'o', 'l'] //False
('h', 'o', 'o') in ['s', 'c', ('h', 'o', 'o'), 'l'] //True
('h', 'o', 'o') not in ('s', 'c', ('h', 'o', 'o'), 'l') //False
'ol' in ['s', 'c', 'h', 'o', 'ol'] //True
's' in ['S', 'c', 'h', 'o', 'o', 'l'] //False
```
13. What is the result of
```
'sch' + 'ool' //'school'
[1, 2, 3] + [4, 5, 6] //[1, 2, 3, 4, 5, 6]
(1, 2, 3) + (4, 5, 6) //(1, 2, 3, 4, 5, 6)
```
14. What is the result of
```
'sch' + 'o' * 10 + 'l' //'schooooooooool'
'do' * 5 //'dododododo'
['s'] + ['o'] * 5 + ['l'] //[['s'], ['o'], ['o'], ['o'], ['o'], ['o'], ['l']]
```
15. How do you express a tuple literal of a single element? For example, how do you write a tuple literal that has the same value as tuple([1])?
```
a = 1,
```
16. Suppose you have x = 1, 2, 3.What is the value of type(x)?
```
tuple
```
17. Suppose you have L = ['f', 'r', 'o', 'g']
What is the new value of L after executing each of the following statements in order?
```
L.append('s') //['f', 'r', 'o', 'g', 's']
L.extend(['p', 'o', 'n', 'd']) //['f', 'r', 'o', 'g', 's', 'p', 'o', 'n', 'd']
L.insert(4, ' ') //['f', 'r', 'o', 'g', ' ',s', 'p', 'o', 'n', 'd']
L.reverse() //['d', 'n', 'o', 'p', 's',' ', 'g', 'o', 'r', 'f']
L.sort() //['', 'd', 'f', 'g', 'n', 'o', 'o', 'p', 'r', 's']
L.remove('o') //['', 'd', 'f', 'g', 'n', 'o', 'p', 'r', 's']
L.pop() //['', 'd', 'f', 'g', 'n', 'o', 'p', 'r']
L.pop(0) //['d', 'f', 'g', 'n', 'o', 'p', 'r']
L.clear() //[]
L.append('z') //['z']
```
18. If T = (1, 3, 5, 7, 9, 11), Can you call del(T[1])? why or why not? Can you call del(T)? What is the effect?
```
No, tuple is immutable
Yes, T will be delete
```
19. Suppose L = list('hello') and separately M = list('hello'). After executing
L.reverse()
M = M[::-1]
is L == M evaluate to True or False?
What is the difference between these two ways of reversing elements in a list?
```
True
L reorders the elements in the same list
M will create a new list in reverse and refers to a newly created list
```
20. if T = tuple('hello'), are the following statements allowed in Python? Why or why not?
```
T.reverse() //not allowed(tuple immutable)
T = T[::-1] //allowed
```
21. What is a stack as a data structure? What is another name (4-letter initialism) for a stack? How can a stack be implemented using a list? Show how push and pop can be accomplished by calling list methods.
```
Last-in, First-out (LIFO) data structure
LIFO
push:append
pop:pop()
```
22. What is a queue as a data structure? What is another name (4-letter initialism) for a queue? How can a queue be implemented using a list? Show how enqueue and dequeue can be accomplished by calling list methods.
```
Last-in, Last-out (LILO) data structure
LILO
push:append
pop:pop(0)
```
23. Show how a tuple can be used to implement
```
***T is a tuple
a stack's push and pop functionality //push(a):T = T + a pop:T = T[0:-1]
a queue's enqueue and dequeue functionality //push(a):T = T + a pop:T = T[1:]
Is a tuple more or less efficient than a list for implementing the stack and queue data structures? Why?
less efficient, tuple need to create a new tuple and refers to a newly created tuple
```
24. What do these built-in functions do?
```
max(['h', 'e', 'l', 'l', 'o']) //'o'
min('hello') //'e'
sum([2, 3, 4, 5, 6]) //20
sum(range(10)) //45
any(['', 'apples', 'oranges', 'banana']) //True
any([0, '', 0.0, [], ()]) //False
any(['0', '', 0.0, [], ()]) //True
any([0, ' ', 0.0, [], ()]) //True
all(['', 'apples', 'oranges', 'banana']) //False
all([' ', 'apples', 'oranges', 'bananas'])//True
all([0, '', 0.0, [], ()]) //False
```
25. What is the non-mutation version of the following statements? Assume L is a list
```
L.sort() //L = sorted(L)
L.reverse() //L = L[::-1]
L.extend([1, 2, 3]) //L = L + [1, 2, 3]
del(L[1]) //L = L[:1] + L[2:]
L.pop() //L = L[:-1]
```
26. How do you use list comprehension to create a list with values
```
['*', '**', '***', '****', '*****'] //['*'*i for i in range(1, 6)]
[1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 2048, 4096] //[2**i for i in range(13)]
```
27. How do you use two-level list comprehension to create a multiplication table in the following format: [(1, 1, 1), (1, 2, 2), (1, 3, 3), … (1, 9, 9), (2, 1, 2), (2, 2, 4), (2, 3, 6), (2, 4, 8), … (2, 9, 18), (3, 1, 3), (3, 2, 6), (3, 3, 9), … (3, 9, 27), (4, 1, 4) … (4, 9, 36), (5, 1, 5), … (9, 9, 81)]
```
[(i, j, i*j) for i in range(1, 10) for j in range(1, 10)]
```
28. How do you use list comprehension with filter to generate the list of upper-case letters except 'A', 'E', 'I', 'O', 'U'?
```
[chr(i) for i in range(65, 91) if chr(i) not in ['A', 'E', 'I', 'O', 'U']]
```
29. fter executing the following sequence of statements:
x = 3
y = x
x = 4
what is the value of y?
```
3
```
30. After executing the following sequence of statements
x = [1, 2, 3]
y = x
x = [4, 5, 6]
what is the value of y?
```
[1, 2, 3]
```
31. After executing the following sequence of statements
x = [1, 2, 3]
y = x
x[1] = 4
what is the value of y?
```
[1, 4, 3]
```
32. After executing the following sequence of statements
x = [1, 2, 3]
y = x[:]
x[1] = 4
what is the value of y?
```
[1 ,2 ,3]
```
33. After executing the following sequence of statements
x = [1, 2, 3]
y = x
y[:] = [4, 5, 6]
what is the value of x?
```
[4, 5, 6]
```
34. After executing the following sequence of statements
z = ['a', 'b']
x = [1, z, 3]
z.append('c')
what is the value of x?
```
[1, ['a', 'b', 'c'], 3]
```
35. After executing the following sequence of statements
z = ['a', 'b']
x = [1, z, 3]
y = x
z.append('c')
what is the value of y?
```
[1, ['a', 'b', 'c'], 3]
```
36. After executing the following sequence of statements
z = ['a', 'b']
x = [1, z, 3]
y = x[:]
z.append('c')
what is the value of y?
```
[1, ['a', 'b', 'c'], 3]
```
37. After executing the following sequence of statements
z = ['a', 'b']
x = [1, z, 3]
y = x[:]
x[0] = 4
z.append('c')
what is the value of y?
```
[1, ['a', 'b', 'c'], 3]
```
38. After executing the following sequence of statements
import copy
z = ['a', 'b']
x = [1, z, 3]
y = copy.copy(x)
x[0] = 4
z.append('c')
what is the value of y?
```
[1, ['a', 'b', 'c'], 3]
```
39. After executing the following sequence of statements
import copy
z = ['a', 'b']
x = [1, z, 3]
y = copy.deepcopy(x)
x[0] = 4
z.append('c')
what is the value of y?
```
[1, ['a', 'b'], 3]
```
40. What is the type of {}?
```
dict
```
41. What is the expression for an empty set?
```
s = set()
```
42. Which of the following can or cannot be a member of a set? Why?
```
'hello' //can
23 //can
44.27 //can
5e-3 //can
2+4j //can
['Mary', 'had', 'a', 'little', 'lamb'] //can`t(list mutable)
('Mary', 'had', 'a', 'little', 'lamb') //can
{'Mary', 'had', 'a', 'little', 'lamb'} //can`t(set mutable)
{'Sun': 0, 'Mon': 1, 'Tue': 2, 'Wed': 3} //can`t(dict mutable)
True //can
False //can
() //can
[] //can`t(list mutable)
{} //can`t(dict mutable)
```
43. What is the value of len(set('hello'))?
```
4
```
44. What is the value of each of the following expressions?
```
{1, 2} - {2, 3} //{1}
{1, 2} | {2, 3} //{1, 2, 3}
{1, 2} & {2, 3} //{2}
{1, 2} ^ {2, 3} //{1 ,3}
```
45. What is the result of the following comparisons?
```
{1, 2, 3} > {2, 3} //True
{1, 2, 3} < {1, 2, 4} //False
{1, 2, 2, 3} == {1, 2, 3} //True
{1, 2, 4} != {4, 2, 1} //False
```
46. Assume S = {1, 2, 3}, what is the difference between
S = S \| \{3, 4} and S \|= {3, 4}?
```
S = S | {3, 4} //S is union of S and {3, 4}
S |= {3, 4} //S add {3, 4}
```
47. Assume D = {'Sun': 0, 'Mon': 1, 'Tue': 2, 'Wed': 3}
```
What is the value of D['Mon']? //1
What is the value of D after D['Thu'] = 4? //{'Sun': 0, 'Mon': 1, 'Tue': 2, 'Wed': 3, 'Thu': 4}
Continuing with the previous statement, what is the value of D after D['Sun'] = 7? // {'Sun': 0, 'Mon': 1, 'Tue': 2, 'Wed': 3, 'Thu': 4, 'Sun':7}
What happens if you attempt print(D['Fri'])? //Key error
```
48. Assume D = {'Sun': 0, 'Mon': 1, 'Tue': 2, 'Wed': 3}
```
What is the value of D.keys() //dict_keys(['Sun', 'Mon', 'Tue', 'Wed'])
What is the value of D.values() //dict_values([0, 1, 2, 3])
What is the value of D.items() //dict_items([('Sun': 0), ('Mon': 1),( 'Tue': 2), ('Wed': 3)])
```
49. Assuming D = {}, which of the following is legal or not legal in Python? If not legal, why not?
```
D[()] = 10 //legal
D[''] = {} //legal
D[0] = '' //legal
D[{}] = () //illegal (dict is mutable)
D[[]] = set() //illegal (list is mutable)
D[:] = range(10) //illegal (slice is mutable)
D[-1] = [-1] //legal
D[(())] = [{}] //legal
```
50. How do you use dictionary comprehension to create a reverse mapping? For example, suppose D = {'Sun': 0, 'Mon': 1, 'Tue': 2, 'Wed': 3, 'Thu': 4, 'Fri': 5, 'Sat': 6}, create its reverse mapping whose value should be {0: 'Sun', 1: 'Mon', 2: 'Tue', 3: 'Wed', 4: 'Thu', 5: 'Fri', 6: 'Sat'}?
```
{D[i]:i for i in D.keys()}
```
## 2. Programming
1. Write a program that prompts the user a sentence and a list of prohibited characters. The program needs to report a list which includes all characters in the sentence except those appear in the prohibited list. For example, (blue text = typed input, green highlight = program printout)
$ python3 Week5_q1.py
Enter a sentence: HelloPython
Enter prohibited list: ['l','P','h']
['H', 'e', 'o', 'y', 't', 'o', 'n']
Note : Sentence is case sensitive.
2. Assume you are a server in a restaurant and you are taking the orders of a table of 4 people. They first ask you for the menu. After you give them the menu (including the meals and the prices), they take turn to order. Finally, you have to summary their orders and tell them the total bill amount.
Write a program to simulate the above process.
For example: (pink highlight = typed input, black text = program output, blue text = program output dependent to input)
$ (input)python3 week5_q2.py
customers: What are you serving today?
server: We have (input)beef noodles ($100), dumplings ($60), rice ($10), vegetable ($40), tea ($30), juice ($20)
customer1: (input)beef noodles, tea
customer2: (input)dumplings, rice, vegetable, tea
customer3: (input)rice, vegetable, tea
customer4: (input)dumplings, juice
server: Okay, you ordered beef noodles * 1, dumplings * 2, rice * 2, vegetable * 2, tea * 3, juice * 1. $430 in total
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