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Review Question 1

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What is the result of the following operation in Python: 3+2*2 10 7 9 12 Review Question 2 In Python, if you executed name = ‘Lizz’, what would be the output of print(name[0:2])? Lizz L Liz Li Review Question 3 In Python, if you executed var = ‘01234567’, what would be the result of print(var[::2])? 0246 1357 1234567 8903 Review Question 4 In Python, what is the result of the following operation ‘1’+’2′ ‘2’ ‘3’ ’12’ 3

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Review Question 5 Given myvar = ‘hello’, how would you convert myvar into uppercase? len(myvar) myvar.find(‘hello’) myvar.upper() myvar.sum()

Question 1 What is the syntax to obtain the first element of the tuple: A=(‘a’,’b’,’c’) A[1] A[0] correct A[:] Question 2 After applying the following method,L.append([‘a’,’b’]), the following list will only be one element longer. True False Question 3 How many duplicate elements can you have in a set? 1 0, you can only have one unique element in a set 100 depends on the number of elements in your set. Question 4

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>>>>Consider the following Python Dictionary: Dict={“A”:1,”B”:”2″,”C”:[3,3,3],”D”:(4,4,4),’E’:5,’F’:6} , what is the result of the following operation: Dict[“D”] 4 3 [3,3,3] (4, 4, 4) correct error Question 5 What is an important difference between lists and tuples? Lists can’t contain a string Tuples can only have integers Lists and tuples are the same. Lists are mutable tuples are not There is no zeros in lists

Question 1 What is the output of the following lines of code: x=1 if(x!=1): print(‘Hello’) else: print(‘Hi’) print(‘Mike’)

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Hi Mike Mike Hello Mike The Mike Question 2 What is the output of the following few lines of code ? A=[‘1′,’2′,’3’] for a in A: print(2*a) 246 ‘2’ ‘4’ ‘6’ ’11’ ’22’ ’33’ ABC Question 3 Consider the function Delta, when will the function return a value of 1 def Delta(x): if x==0: y=1; else: y=0; return(y) When the input is anything but 0 When the input in 1 Never When the input is 0

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Duplicate of ‘Question 3’ Consider the function Delta, when will the function return a value of 1 def Delta(x): if x==0: y=1; else: y=0; return(y) When the input is anything but 0 When the input in 1 Never When the input is 0 Question 4 What is the correct way to sort the list ‘B’ using a method, the result should not return a new list, just change the list ‘B’. B.sort() sort(B) sorted(B) B.sorted() Question 5 what are the keys of the of the following {‘a’:1,’b’:2} 1,2 ;,: a,b

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Question 1 What do the following lines of code do? with open(“Example1.txt”,”r”) as file1: FileContent=file1.readlines() print(FileContent) Read the file “Example1.txt” correct Write to the file “Example1.txt” Append the file “Example1.txt” Question 2 What do the following lines of code do? with open(“Example2.txt”,”w”) as writefile: writefile.write(“This is line A\n”) writefile.write(“This is line B\n”) Read the file “Example2.txt” Write to the file “Example2.txt” Append the file “Example2.txt” Question 3 What do the following lines of code do? with open(“Example3.txt”,”a”) as file1: file1.write(“This is line C\n”)

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Read the file “Example3.txt” Write to the file “Example3.txt” Append the file “Example3.txt” Question 4 What is the result of applying the following method df.head(), to the dataframe df prints the first row of the dataframe prints the first column of the dataframe prints the first 5 rows of the dataframe prints the dateframe out

Multiple Choice 1. What is the result of the following lines of code: a=np.array([0,1,0,1,0]) b=np.array([1,0,1,0,1]) a*b 0 array([1, 1, 1, 1, 1]) array([0, 0, 0, 0, 0]) Multiple Choice what is the result of the following lines of code: a=np.array([0,1]) b=np.array([1,0]) np.dot(a,b)

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1 array([1,1]) 0 array([0,0]) Multiple Choice what is the result of the following lines of code: a=np.array([1,1,1,1,1]) a+10 array([10,10,10,10,10]) array([11, 11, 11, 11, 11]) array([1,1,1,1,1]) Multiple Choice what is the correct code to perform matrix multiplication on the matrix A and B np.dot(A,B) A*B AxB

1) What is the result of the following operation 3+2*2? 3 12 9 7 2) What is the type of the following variable: a=True?

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int bool str list 3) What is the result of the following operation int(3.2)? 3.2 3 4 ‘3.2’ 4) Consider the string A=’1234567′, what is the result of the following operation: A[1::2] ‘1234567’ ‘246’ ‘1357’ error 5) Consider the string Name=”Michael Jackson” , what is the result of the following operation Name.find(‘el’) 5 4 5,6 -1 6) The variables A=’1′ and B=’2′ ,what is the result of the operation A+B? you cant add two strings

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3 ‘3’ ’12’ 7) Consider the variable F=”You are wrong”, Convert the values in the variable F to uppercase? F.up() F.upper F.upper() 8) Consider the tuple tuple1=(“A”,”B”,”C” ), what is the result of the following operation tuple1[-1]? “A” “B” “C” 9) Consider the tuple A=((11,12),[21,22]), that contains a tuple and list. What is the result of the following operation A[1]: ((11,12),[21,22]) (11,12) (21,22) [21,22] 10) Consider the tuple A=((11,12),[21,22]), that contains a tuple and list. What is the result of the following operation A[0][1]:

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12 11 22 21 11 What is the result of the following operation ‘1,2,3,4’.split(‘,’) ‘1’,’2′,’3′,’4′ (‘1′,’2′,’3′,’4’) [‘1′,’2′,’3′,’4’] ‘1234’ 12 Concatenate the following lists A=[1,’a’] and B=[2,1,’d’]: A+B A-B A*B A/B 13 How do you cast the list ‘A’ to the set ‘a’? a.set() a=A.append() a=A.dict() a=set(A) 14 Consider the Set: V={‘A’,’B’}, what is the result of V.add(‘C’)? {‘A’,’B’} {‘A’,’B’,’C’} {‘AC’,’BC’} error

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15 Consider the Set: V={‘A’,’B’,’C’ }, what is the result of V.add(‘C’)? {‘A’,’B’} {‘A’,’B’,’C’} {‘A’,’B’,’C’,’C’} error 16 What is the output of the following lines of code: x=”Go” if(x!=”Go”): print(‘Stop’) else: print(‘Go ‘) print(‘Mike’) Go Mike Mike Stop Mike The Mike 17 What is the output of the following lines of code: x=”Go” if(x==”Go”): print(‘Go ‘)

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else: print(‘Stop’) print(‘Mike’) Go Mike Mike Stop Mike The Mike 18 how many iterations are performed in the following loop? for n in range(3): print(n) 1 2 3 4 19 What does the following loop print? for n in range(3): print(n+1) 012 123 321 210 20 What is the output of the following few lines of code ?

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A=[‘1′,’2′,’3’] for a in A: print(2*a) 246 ‘2’ ‘4’ ‘6’ ’11’ ’22’ ’33’ ABC 21 Consider the function add, what is the result of calling the following Add(‘1′,’1’) (look closely at the return statement ) def Add(x,y): z=y+x return(y) error ‘2’ ’11’ ‘1’ 22 Consider the class Points, what are the data attributes: class Points(object): def __init__(self,x,y): self.x=x self.y=y def print_point(self):

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print(‘x=’,self.x,’y=’,self.y) __init__ self.x self.y print_point 23 What is the result of running the following lines of code ? class Points(object): def __init__(self,x,y): self.x=x self.y=y def print_point(self): print(‘x=’,self.x,’ y=’,self.y) p1=Points(1,2) p1.print_point() x=1 y=2 x=1 y=2 24 What is the result of running the following lines of code ? class Points(object): def __init__(self,x,y): self.x=x

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self.y=y def print_point(self): print(‘x=’,self.x,’ y=’,self.y) p2=Points(1,2) p2.x=2 p2.print_point() x=1 y=2 x=1 y=2 x=2 y=2 25 Consider the following line of code: with open(example1,”r”) as file1: What mode is the file object in? read write append

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