Test Series - python

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Test Number 43/108

Q: What will be the output of the following Python code snippet?

k = [print(i) for i in my_string if i not in "aeiou"]
A. prints all the vowels in my_string
B. prints all the consonants in my_string
C. prints all characters of my_string that aren’t vowels
D. prints only on executing print(k)
Solution: print(i) is executed if the given character is not a vowel.
Q: What is the output of print(k) in the following Python code snippet?

k = [print(i) for i in my_string if i not in "aeiou"]
print(k)
A. all characters of my_string that aren’t vowels
B. a list of Nones
C. list of Trues
D. list of Falses
Solution: print() returns None.
Q: What will be the output of the following Python code snippet?

my_string = "hello world"
k = [(i.upper(), len(i)) for i in my_string]
print(k)
A. [(‘HELLO’, 5), (‘WORLD’, 5)]
B. [(‘H’, 1), (‘E’, 1), (‘L’, 1), (‘L’, 1), (‘O’, 1), (‘ ‘, 1), (‘W’, 1), (‘O’, 1), (‘R’, 1), (‘L’, 1), (‘D’, 1)]
C. [(‘HELLO WORLD’, 11)]
D. none of the mentioned
Solution: We are iterating over each letter in the string.
Q: Which of the following is the correct expansion of list_1 = [expr(i) for i in list_0 if func(i)]?
A. list_1 = [] for i in list_0: if func(i): list_1.append(i)
B. for i in list_0: if func(i): list_1.append(expr(i))
C. list_1 = [] for i in list_0: if func(i): list_1.append(expr(i))
D. none of the mentioned
Solution: We have to create an empty list, loop over the contents of the existing list and check if a condition is satisfied before performing some operation and adding it to the new list.
Q: What will be the output of the following Python code snippet?

x = [i**+1 for i in range(3)]; print(x);
A. [0, 1, 2]
B. [1, 2, 5]
C. error, **+ is not a valid operator
D. error, ‘;’ is not allowed
Solution: i**+1 is evaluated as (i)**(+1).
Q: What will be the output of the following Python code snippet?

print([i.lower() for i in "HELLO"])
A. [‘h’, ‘e’, ‘l’, ‘l’, ‘o’]
B. ‘hello’
C. [‘hello’]
D. hello
Solution: We are iterating over each letter in the string.
Q: What will be the output of the following Python code snippet?

print([i+j for i in "abc" for j in "def"])
A. [‘da’, ‘ea’, ‘fa’, ‘db’, ‘eb’, ‘fb’, ‘dc’, ‘ec’, ‘fc’]
B. [[‘ad’, ‘bd’, ‘cd’], [‘ae’, ‘be’, ‘ce’], [‘af’, ‘bf’, ‘cf’]]
C. [[‘da’, ‘db’, ‘dc’], [‘ea’, ‘eb’, ‘ec’], [‘fa’, ‘fb’, ‘fc’]]
D. [‘ad’, ‘ae’, ‘af’, ‘bd’, ‘be’, ‘bf’, ‘cd’, ‘ce’, ‘cf’]
Solution: If it were to be executed as a nested for loop, i would be the outer loop and j the inner loop.
Q: What will be the output of the following Python code snippet?

print([[i+j for i in "abc"] for j in "def"])
A. [‘da’, ‘ea’, ‘fa’, ‘db’, ‘eb’, ‘fb’, ‘dc’, ‘ec’, ‘fc’]
B. [[‘ad’, ‘bd’, ‘cd’], [‘ae’, ‘be’, ‘ce’], [‘af’, ‘bf’, ‘cf’]]
C. [[‘da’, ‘db’, ‘dc’], [‘ea’, ‘eb’, ‘ec’], [‘fa’, ‘fb’, ‘fc’]]
D. [‘ad’, ‘ae’, ‘af’, ‘bd’, ‘be’, ‘bf’, ‘cd’, ‘ce’, ‘cf’]
Solution: The inner list is generated once for each value of j.
Q: What will be the output of the following Python code snippet?

print([if i%2==0: i; else: i+1; for i in range(4)])
A. [0, 2, 2, 4]
B. [1, 1, 3, 3]
C. error
D. none of the mentioned
Solution: Syntax error.
Q: Which of the following is the same as list(map(lambda x: x**-1, [1, 2, 3]))?
A. [x**-1 for x in [(1, 2, 3)]]
B. [1/x for x in [(1, 2, 3)]]
C. [1/x for x in (1, 2, 3)]
D. error
Solution: x**-1 is evaluated as (x)**(-1).

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