Intro to python: Quiz/Assessment

Which of the following pairs of functions yield the same output? A.) def fun(n):return n*n*n lambda_cube = lambda n: n*n*n B.) def fun(n):n*n*n lambda_cube = lambda n: n*n*n C.) def fun(n):n*n*n lambda_cube = lambda n: return n*n*n D.) def fun(n):return n*n*n lambda_cube = lambda n: return n*n*n

A.) def fun(n):return n*n*n lambda_cube = lambda n: n*n*n ****lambda functions in Python do not need return statements, the value to be returned has to be specified after the colon. But user-defined functions in Python need a return statement to return values.

int and int or int + int 3+5

Adding two integers in Python will return the sum of the two integers.

float and int: 3.6 + 4

Adding two strings in Python will return a string which will be a concatenation of the two strings.

string and string or ''Python" +"Python ''

Adding two strings in Python will return a string which will be a concatenation of the two strings.

What will be the type of the variable 'c' after running the following code snippet? a = 10 b = 2.3 c = a*b A) Int B) float C) decimal D) complex

B) float ***Here, a is of type int and b is of type float. When any mathematical operation happens between int and float type variables, the output is always typecasted to float to store the decimal point values. This is known as implicit type conversion. Here, even though the multiplication of 10*2.3 results in 23, the value stored will be 23.0 due to implicit type conversion. ***The type of variable c can be confirmed using the following code: type(c)

For which of the following pairs of datatypes does the addition operation raise an error? A.) float and int B.) int and string C.) string and string D) int and int

B) int and string

How will you fetch [True, 46] from the list below? list = ["Great", 51, True, 46, "Hi"] [ 0 , 1 , 2 , 3, 4 A.) list[3:5] B.) list[2:-1] C.) list[2:3] D.) list[1:3]

B.) list[2:-1] ***True and 46 are at index positions 2 and 3 (or -3 and -2) respectively of the given list. So, list[2:-1] will return [True, 46] from the given list.

What will be the value of the variable 'a' after the fourth iteration of the following for loop? a = 1 for i in range(1,6): a = a*i print(a) A) 120 B) 1 C) 24 D) 720

C) 24 ***range(start, step, stop) returns a sequence that starts from the number start (is inclusive), increments in the step of the number step, and ends before the number stop (is exclusive). By default, the sequence starts from 0 and increments with a step of 1. ***As per the given code, range(1,6) returns a sequence starting from 1 and ending at 5 (because 6 is excluded), with increments of 1 (by default). The loop will iterate over the numbers 1, 2, 3, 4, and 5 (5 iterations). ***The result of each iteration will be as follows: 1st iteration: a =1 and i=1 a = a*i =>1*1 =1 New value of a is 1 2nd iteration: a =1 and i=2 a = a*i =>1*2 =2 New value of a is 2 3rd iteration: a =2 and i=3 a = a*i =>2*3 =6 New value of a is 6 4th iteration: a =6 and i=4 a = a*i =>6*4 =24 New value of a is 24 5th iteration: a =24 and i=5 a = a*i =>24*5 =120 New value of a is 120 So, the value for the fourth iteration will be 24.

Which of the following is NOT true regarding loops in Python? A.) Loops are used to perform certain tasks repeatedly B) while loop is used when multiple statements are to be executed repeatedly until the given condition becomes False C) while loop is used when multiple statements are to be executed repeatedly until the given condition becomes True D) for loop can be used to iterate through the elements of lists

C) while loop is used when multiple statements are to be executed repeatedly until the given condition becomes True ****Looping statements in Python are used to perform a certain task continuously until the given condition becomes False. EX: while a > 5: This loop will go on performing iterations as long as the variable 'a' takes values greater than 5. It will stop when the value of 'a' becomes less than or equal to 5.

What will be the output of the following code snippet? i = '20' if i > 20: print(1) else: print(2) A) 1 B) 2 C) '2' D) TypeError

D) TypeError TypeError: '>' not supported between instances of 'str' and 'int' The error message generated by above code will be of TypeError, Here, i='20' is a variable of string datatype (as the value denoted is inside quotation marks). So, when the i>20 condition is encountered by Python, it throws an error message because, we are trying to compare a string to an integer (i.e. 20).

What will be the output of the following code? list_mul = ['2','2','2']list_mul*2 A.) [4, 4, 4] B.) [2, 2, 2, 2, 2, 2] C.) ['4', '4', '4', '4', '4', '4'] D.) ['2', '2', '2', '2', '2', '2']

D.) ['2', '2', '2', '2', '2', '2'] ****The * operator multiplies numbers of elements rather than multiplication of individual elements. So, 2 times of ['2', '2', '2'] will create the list ['2', '2', '2', '2', '2', '2'].

int and string or 3 + "Python"

This will raise an error as a string in Python can only be added to another string. It cannot be added to other datatypes.

User-defined functions in Python need

a return statement to return values

Following is a dictionary named alphabets: alphabets = {'1':'A','2':'B','3': ['C','D','E']} Which statement among the following will fetch the element 'E'?

alphabets['3'][2] Dict: alphabets = {'1':'A','2':'B','3': ['C','D','E']} 1, 2, 3 = Keys A, B, C, D & E = Values 3: C, D & E 3: 0, 1, & 2 indexes ['3']{2] ***Here, the list ['C','D','E'] is stored inside a dictionary under key '3'. So to fetch the 'E' we have to first call key '3' and then call the 'E' by index(since ['C','D','E'] is a list ). To achieve this we can call it by the following code. alphabets['3'][2]

Lambda functions in Python do not need

return statements, the value to be returned has to be specified after the colon.