CORE DATATYPES
1. Which of these in not a core datatype?
a) Lists
b) Dictionary
c) Tuples
d) ClassView Answer
a) Lists
b) Dictionary
c) Tuples
d) ClassView Answer
Answer:d
Explanation:Class is a user defined datatype.
Explanation:Class is a user defined datatype.
2. Given a function that does not return any value, What value is thrown by default when executed in shell.
a) int
b) bool
c) void
d) NoneView Answer
a) int
b) bool
c) void
d) NoneView Answer
Answer:d
Explanation:Python shell throws a NoneType object back.
Explanation:Python shell throws a NoneType object back.
3. Following set of commands are executed in shell, what will be the output?
>>>str="hello"
>>>str[:2]
>>>
a) he
b) lo
c) olleh
d) helloView Answer
b) lo
c) olleh
d) helloView Answer
Answer:a
Explanation:We are printing only the 1st two bytes of string and hence the answer is “he”.
Explanation:We are printing only the 1st two bytes of string and hence the answer is “he”.
4. Which of the following will run without errors(multiple answers possible) ?
a) round(45.8)
b) round(6352.898,2)
c) round()
d) round(7463.123,2,1)View Answer
a) round(45.8)
b) round(6352.898,2)
c) round()
d) round(7463.123,2,1)View Answer
Answer:a,b
Explanation:Execute help(round) in the shell to get details of the parameters that are passed into the round function.
Explanation:Execute help(round) in the shell to get details of the parameters that are passed into the round function.
5. What is the return type of function id ?
a) int
b) float
c) bool
d) dictView Answer
a) int
b) float
c) bool
d) dictView Answer
Answer:a
Explanation:Execute help(id) to find out details in python shell.id returns a integer value that is unique.
Explanation:Execute help(id) to find out details in python shell.id returns a integer value that is unique.
6. In python we do not specify types,it is directly interpreted by the compiler, so consider the following operation to be performed.
>>>x = 13 ? 2
objective is to make sure x has a integer value, select all that apply (python 3.xx)
a) x = 13 // 2
b) x = int(13 / 2)
c) x = 13 / 2
d) x = 13 % 2View Answer
a) x = 13 // 2
b) x = int(13 / 2)
c) x = 13 / 2
d) x = 13 % 2View Answer
Answer:a,b,d
Explanation:// is integer operation in python 3.0 and int(..) is a type cast operator.
Explanation:// is integer operation in python 3.0 and int(..) is a type cast operator.
7. What error occurs when you execute?
apple = mango
a) SyntaxError
b) NameError
c) ValueError
d) TypeErrorView Answer
apple = mango
a) SyntaxError
b) NameError
c) ValueError
d) TypeErrorView Answer
Answer:b
Explanation:Mango is not defined hence name error.
Explanation:Mango is not defined hence name error.
8. Carefully observe the code and give the answer.
def example(a):
a = a + '2'
a = a*2
return a
>>>example("hello")
a) indentation Error
b) cannot perform mathematical operation on strings
c) hello2
d) hello2hello2View Answer
b) cannot perform mathematical operation on strings
c) hello2
d) hello2hello2View Answer
Answer:a
Explanation:Python codes have to be indented properly.
Explanation:Python codes have to be indented properly.
9. What dataype is the object below ?
L = [1, 23, ‘hello’, 1] a) List
b) dictionary
c) array
d) tupleView Answer
L = [1, 23, ‘hello’, 1] a) List
b) dictionary
c) array
d) tupleView Answer
Answer:a
Explanation:List datatype can store any values within it.
Explanation:List datatype can store any values within it.
10. In order to store values in terms of key and value we use what core datatype.
a) List
b) tuple
c) class
d) dictionaryView Answer
a) List
b) tuple
c) class
d) dictionaryView Answer
Answer:d
Explanation:Dictionary stores values in terms of keys and values.
Explanation:Dictionary stores values in terms of keys and values.
11. Which of the following results in a SyntaxError(Multiple answers possible) ?
a) ‘”Once upon a time…”, she said.’
b) “He said, “Yes!””
c) ‘3\’
d) ”’That’s okay”’View Answer
a) ‘”Once upon a time…”, she said.’
b) “He said, “Yes!””
c) ‘3\’
d) ”’That’s okay”’View Answer
Answer:b,c
Explanation:Carefully look at the colons.
Explanation:Carefully look at the colons.
12. The following is displayed by a print function call:
tomdickharry
Select all of the function calls that result in this output
a) print(”’tom
\ndick
\nharry”’)
b) print(”’tom
dick
harry”’)
c) print(‘tom\ndick\nharry’)
d) print(‘tom
dick
harry’)View Answer
a) print(”’tom
\ndick
\nharry”’)
b) print(”’tom
dick
harry”’)
c) print(‘tom\ndick\nharry’)
d) print(‘tom
dick
harry’)View Answer
Answer:b,c
Explanation:The \n adds a new line.
Explanation:The \n adds a new line.
13. What is the average value of the code that is executed below ?
>>>grade1 = 80
>>>grade2 = 90
>>>average = (grade1 + grade2) / 2
a) 85
b) 85.0
c) 95
d) 95.0View Answer
b) 85.0
c) 95
d) 95.0View Answer
Answer:b
Explanation:Cause a decimal value to appear as output.
Explanation:Cause a decimal value to appear as output.
14. Select all options that print
hello-how-are-you
a) print(‘hello’, ‘how’, ‘are’, ‘you’)
b) print(‘hello’, ‘how’, ‘are’, ‘you’ + ‘-‘ * 4)
c) print(‘hello-‘ + ‘how-are-you’)
d) print(‘hello’ + ‘-‘ + ‘how’ + ‘-‘ + ‘are’ + ‘-‘ + ‘you’)View Answer
hello-how-are-you
a) print(‘hello’, ‘how’, ‘are’, ‘you’)
b) print(‘hello’, ‘how’, ‘are’, ‘you’ + ‘-‘ * 4)
c) print(‘hello-‘ + ‘how-are-you’)
d) print(‘hello’ + ‘-‘ + ‘how’ + ‘-‘ + ‘are’ + ‘-‘ + ‘you’)View Answer
Answer:c,d
Explanation:Execute in the shell.
Explanation:Execute in the shell.
15. What is the return value of trunc() ?
a) int
b) bool
c) float
d) NoneView Answer
a) int
b) bool
c) float
d) NoneView Answer
Answer:a
Explanation:Executle help(math.trunc) to get details.
Explanation:Executle help(math.trunc) to get details.
BASIC OPERATORS
1. Which is the correct operator for power(x^y)?
a) X^y
b) X**y
c) X^^y
d) None of the mentionedView Answer
a) X^y
b) X**y
c) X^^y
d) None of the mentionedView Answer
Answer: b
Explanation: In python, power operator is x**y i.e. 2**3=8.
Explanation: In python, power operator is x**y i.e. 2**3=8.
2. Which one of these is floor division?
a) /
b) //
c) %
d) None of the mentionedView Answer
a) /
b) //
c) %
d) None of the mentionedView Answer
Answer: b
Explanation: When both of the operands are integer then python chops out the fraction part and gives you the round off value, to get the accurate answer use floor division. This is floor division. For ex, 5/2 = 2.5 but both of the operands are integer so answer of this expression in python is 2.To get the 2.5 answer, use floor division.
Explanation: When both of the operands are integer then python chops out the fraction part and gives you the round off value, to get the accurate answer use floor division. This is floor division. For ex, 5/2 = 2.5 but both of the operands are integer so answer of this expression in python is 2.To get the 2.5 answer, use floor division.
3. What is the order of precedence in python?
i) Parentheses
ii) Exponential
iii) Division
iv) Multiplication
v) Addition
vi) Subtraction
a) i,ii,iii,iv,v,vi
b) ii,i,iii,iv,v,vi
c) ii,i,iv,iii,v,vi
d) i,ii,iii,iv,vi,vView Answer
i) Parentheses
ii) Exponential
iii) Division
iv) Multiplication
v) Addition
vi) Subtraction
a) i,ii,iii,iv,v,vi
b) ii,i,iii,iv,v,vi
c) ii,i,iv,iii,v,vi
d) i,ii,iii,iv,vi,vView Answer
Answer: a
Explanation: For order of precedence, just remember this PEDMAS (similar to BODMAS)
Explanation: For order of precedence, just remember this PEDMAS (similar to BODMAS)
4. What is answer of this expression, 22 % 3 is?
a) 7
b) 1
c) 0
d) 5View Answer
a) 7
b) 1
c) 0
d) 5View Answer
Answer: b
Explanation: Modulus operator gives remainder. So, 22%3 gives the remainder, that is, 1.
Explanation: Modulus operator gives remainder. So, 22%3 gives the remainder, that is, 1.
5. Mathematical operations can be performed on a string. State whether true or false.
a) True
b) FalseView Answer
a) True
b) FalseView Answer
Answer: b
Explanation: You can’t perform mathematical operation on string even if the string is in the form: ‘1234…’.
Explanation: You can’t perform mathematical operation on string even if the string is in the form: ‘1234…’.
6. Operators with the same precedence are evaluated in which manner?
a) Left to Right
b) Right to LeftView Answer
a) Left to Right
b) Right to LeftView Answer
Answer: a
Explanation: None.
Explanation: None.
7. What is the output of this expression, 3*1**3?
a) 27
b) 9
c) 3
d) 1View Answer
a) 27
b) 9
c) 3
d) 1View Answer
Answer: c
Explanation: First this expression will solve 1**3 because exponential have higher precedence than multiplication, so 1**3 = 1 and 3*1 = 3. Final answer is 3.
Explanation: First this expression will solve 1**3 because exponential have higher precedence than multiplication, so 1**3 = 1 and 3*1 = 3. Final answer is 3.
8. Which one of the following have the same precedence?
a) Addition and Subtraction
b) Multiplication and Division
c) a and b
d) None of the mentionedView Answer
a) Addition and Subtraction
b) Multiplication and Division
c) a and b
d) None of the mentionedView Answer
Answer: c
Explanation: None.
Explanation: None.
9. The expression Int(x) implies that the variable x is converted to integer. State whether true or false.
a) True
b) FalseView Answer
a) True
b) FalseView Answer
Answer: a
Explanation: None.
Explanation: None.
10. Which one of the following have the highest precedence in the expression?
a) Exponential
b) Addition
c) Multiplication
d) ParenthesesView Answer
a) Exponential
b) Addition
c) Multiplication
d) ParenthesesView Answer
Answer: d
Explanation: Just remember: PEDMAS, that is, Parenthesis, Exponentiation, Division, Multiplication, Addition, Subtraction. Note that the precedence order of Division and Multiplication is the same. Likewise, the order of Addition and Subtraction is also the same.
Explanation: Just remember: PEDMAS, that is, Parenthesis, Exponentiation, Division, Multiplication, Addition, Subtraction. Note that the precedence order of Division and Multiplication is the same. Likewise, the order of Addition and Subtraction is also the same.
VARIABLE NAMES
1. Is Python case sensitive when dealing with identifiers?
a) yes
b) no
c) machine dependent
d) none of the mentionedView Answer
a) yes
b) no
c) machine dependent
d) none of the mentionedView Answer
Answer: a
Explanation: Case is always significant.
Explanation: Case is always significant.
2. What is the maximum possible length of an identifier?
a) 31 characters
b) 63 characters
c) 79 characters
d) none of the mentionedView Answer
a) 31 characters
b) 63 characters
c) 79 characters
d) none of the mentionedView Answer
Answer: d
Explanation: Identifiers can be of any length.
Explanation: Identifiers can be of any length.
3. Which of the following is invalid?
a) _a = 1
b) __a = 1
c) __str__ = 1
d) none of the mentionedView Answer
a) _a = 1
b) __a = 1
c) __str__ = 1
d) none of the mentionedView Answer
Answer: d
Explanation: All the statements will execute successfully but at the cost of reduced readability.
Explanation: All the statements will execute successfully but at the cost of reduced readability.
4. Which of the following is an invalid variable?
a) my_string_1
b) 1st_string
c) foo
d) _View Answer
a) my_string_1
b) 1st_string
c) foo
d) _View Answer
Answer: b
Explanation: Variable names should not start with a number.
Explanation: Variable names should not start with a number.
5. Why are local variable names beginning with an underscore discouraged?
a) they are used to indicate a private variables of a class
b) they confuse the interpreter
c) they are used to indicate global variables
d) they slow down executionView Answer
a) they are used to indicate a private variables of a class
b) they confuse the interpreter
c) they are used to indicate global variables
d) they slow down executionView Answer
Answer: a
Explanation: As Python has no concept of private variables, leading underscores are used to indicate variables that must not be accessed from outside the class.
Explanation: As Python has no concept of private variables, leading underscores are used to indicate variables that must not be accessed from outside the class.
6. Which of the following is not a keyword?
a) eval
b) assert
c) nonlocal
d) passView Answer
a) eval
b) assert
c) nonlocal
d) passView Answer
Answer: a
Explanation: eval can be used as a variable.
Explanation: eval can be used as a variable.
7. All keywords in Python are in
a) lower case
b) UPPER CASE
c) Capitalized
d) noneView Answer
a) lower case
b) UPPER CASE
c) Capitalized
d) noneView Answer
Answer: d
Explanation: True, False and None are capitalized while the others are in lower case.
Explanation: True, False and None are capitalized while the others are in lower case.
8. Which of the following is true for variable names in Python?
a) unlimited length
b) all private members must have leading and trailing underscores
c) underscore and ampersand are the only two special characters allowed
d) noneView Answer
a) unlimited length
b) all private members must have leading and trailing underscores
c) underscore and ampersand are the only two special characters allowed
d) noneView Answer
Answer: a
Explanation: Variable names can be of any length.
Explanation: Variable names can be of any length.
9. Which of the following is an invalid statement?
a) abc = 1,000,000
b) a b c = 1000 2000 3000
c) a,b,c = 1000, 2000, 3000
d) a_b_c = 1,000,000View Answer
a) abc = 1,000,000
b) a b c = 1000 2000 3000
c) a,b,c = 1000, 2000, 3000
d) a_b_c = 1,000,000View Answer
Answer: b
Explanation: Spaces are not allowed in variable names.
Explanation: Spaces are not allowed in variable names.
10. Which of the following cannot be a variable?
a) __init__
b) in
c) it
d) onView Answer
a) __init__
b) in
c) it
d) onView Answer
Answer: b
Explanation: in is a keyword.
Explanation: in is a keyword.
REGULAR EXPRESSIONS
1. Which module in Python supports regular expressions?
a) re
b) regex
c) pyregex
d) none of the mentionedView Answer
a) re
b) regex
c) pyregex
d) none of the mentionedView Answer
Answer: a
Explanation: re is a part of the standard library and can be imported using: import re.
Explanation: re is a part of the standard library and can be imported using: import re.
2. Which of the following creates a pattern object?
a) re.create(str)
b) re.regex(str)
c) re.compile(str)
d) re.assemble(str)View Answer
a) re.create(str)
b) re.regex(str)
c) re.compile(str)
d) re.assemble(str)View Answer
Answer: c
Explanation: It converts a given string into a pattern object.
Explanation: It converts a given string into a pattern object.
3. What does the function re.match do?
a) matches a pattern at the start of the string
b) matches a pattern at any position in the string
c) such a function does not exist
d) none of the mentionedView Answer
a) matches a pattern at the start of the string
b) matches a pattern at any position in the string
c) such a function does not exist
d) none of the mentionedView Answer
Answer: a
Explanation: It will look for the pattern at the beginning and return None if it isn’t found.
Explanation: It will look for the pattern at the beginning and return None if it isn’t found.
4. What does the function re.search do?
a) matches a pattern at the start of the string
b) matches a pattern at any position in the string
c) such a function does not exist
d) none of the mentionedView Answer
a) matches a pattern at the start of the string
b) matches a pattern at any position in the string
c) such a function does not exist
d) none of the mentionedView Answer
Answer: b
Explanation: It will look for the pattern at any position in the string.
Explanation: It will look for the pattern at any position in the string.
5. What is the output of the following?
sentence = 'we are humans' matched = re.match(r'(.*) (.*?) (.*)', sentence) print(matched.groups())
a) (‘we’, ‘are’, ‘humans’)
b) (we, are, humans)
c) (‘we’, ‘humans’)
d) ‘we are humans’View Answer
b) (we, are, humans)
c) (‘we’, ‘humans’)
d) ‘we are humans’View Answer
Answer: a
Explanation: This function returns all the subgroups that have been matched.
Explanation: This function returns all the subgroups that have been matched.
6. What is the output of the following?
sentence = 'we are humans' matched = re.match(r'(.*) (.*?) (.*)', sentence) print(matched.group())
a) (‘we’, ‘are’, ‘humans’)
b) (we, are, humans)
c) (‘we’, ‘humans’)
d) ‘we are humans’View Answer
b) (we, are, humans)
c) (‘we’, ‘humans’)
d) ‘we are humans’View Answer
Answer: d
Explanation: This function returns the entire match.
Explanation: This function returns the entire match.
7. What is the output of the following?
sentence = 'we are humans' matched = re.match(r'(.*) (.*?) (.*)', sentence) print(matched.group(2))
a) ‘are’
b) ‘we’
c) ‘humans’
d) ‘we are humans’View Answer
b) ‘we’
c) ‘humans’
d) ‘we are humans’View Answer
Answer: c
Explanation: This function returns the particular subgroup.
Explanation: This function returns the particular subgroup.
8. What is the output of the following?
sentence = 'horses are fast' regex = re.compile('(?P<animal>\w+) (?P<verb>\w+) (?P<adjective>\w+)') matched = re.search(regex, sentence) print(matched.groupdict())
a) {‘animal’: ‘horses’, ‘verb’: ‘are’, ‘adjective’: ‘fast’}
b) (‘horses’, ‘are’, ‘fast’)
c) ‘horses are fast’
d) ‘are’View Answer
b) (‘horses’, ‘are’, ‘fast’)
c) ‘horses are fast’
d) ‘are’View Answer
Answer: a
Explanation: This function returns a dictionary that contains all the mathches.
Explanation: This function returns a dictionary that contains all the mathches.
9. What is the output of the following?
sentence = 'horses are fast' regex = re.compile('(?P<animal>\w+) (?P<verb>\w+) (?P<adjective>\w+)') matched = re.search(regex, sentence) print(matched.groups())
a) {‘animal’: ‘horses’, ‘verb’: ‘are’, ‘adjective’: ‘fast’}
b) (‘horses’, ‘are’, ‘fast’)
c) ‘horses are fast’
d) ‘are’View Answer
b) (‘horses’, ‘are’, ‘fast’)
c) ‘horses are fast’
d) ‘are’View Answer
Answer: b
Explanation: This function returns all the subgroups that have been matched.
Explanation: This function returns all the subgroups that have been matched.
10. What is the output of the following?
sentence = 'horses are fast' regex = re.compile('(?P<animal>\w+) (?P<verb>\w+) (?P<adjective>\w+)') matched = re.search(regex, sentence) print(matched.group(2))
a) {‘animal’: ‘horses’, ‘verb’: ‘are’, ‘adjective’: ‘fast’}
b) (‘horses’, ‘are’, ‘fast’)
c) ‘horses are fast’
d) ‘are’View Answer
b) (‘horses’, ‘are’, ‘fast’)
c) ‘horses are fast’
d) ‘are’View Answer
Answer: d
Explanation: This function returns the particular subgroup.
Explanation: This function returns the particular subgroup.
NUMERIC TYPES
1. What is the output of print 0.1 + 0.2 == 0.3?
a) True
b) False
c) Machine dependent
d) ErrorView Answer
a) True
b) False
c) Machine dependent
d) ErrorView Answer
Answer: b
Explanation: Neither of 0.1, 0.2 and 0.3 can be represented accurately in binary. The round off errors from 0.1 and 0.2 accumulate and hence there is a difference of 5.5511e-17 between (0.1 + 0.2) and 0.3.
Explanation: Neither of 0.1, 0.2 and 0.3 can be represented accurately in binary. The round off errors from 0.1 and 0.2 accumulate and hence there is a difference of 5.5511e-17 between (0.1 + 0.2) and 0.3.
2. Which of the following is not a complex number?
a) k = 2 + 3j
b) k = complex(2, 3)
c) k = 2 + 3l
d) k = 2 + 3JView Answer
a) k = 2 + 3j
b) k = complex(2, 3)
c) k = 2 + 3l
d) k = 2 + 3JView Answer
Answer: c
Explanation: l (or L) stands for long.
Explanation: l (or L) stands for long.
3. What is the type of inf?
a) Boolean
b) Integer
c) Float
d) ComplexView Answer
a) Boolean
b) Integer
c) Float
d) ComplexView Answer
Answer: c
Explanation: Infinity is a special case of floating point numbers. It can be obtained by float(‘inf’).
Explanation: Infinity is a special case of floating point numbers. It can be obtained by float(‘inf’).
4. What does ~4 evaluate to?
a) -5
b) -4
c) -3
d) +3View Answer
a) -5
b) -4
c) -3
d) +3View Answer
Answer: a
Explanation: ~x is equivalent to -(x+1).
Explanation: ~x is equivalent to -(x+1).
5. What does ~~~~~~5 evaluate to?
a) +5
b) -11
c) +11
d) -5View Answer
a) +5
b) -11
c) +11
d) -5View Answer
Answer: a
Explanation: ~x is equivalent to -(x+1).
Explanation: ~x is equivalent to -(x+1).
6. Which of the following is incorrect?
a) x = 0b101
b) x = 0x4f5
c) x = 19023
d) x = 03964View Answer
a) x = 0b101
b) x = 0x4f5
c) x = 19023
d) x = 03964View Answer
Answer: d
Explanation: Numbers starting with a 0 are octal numbers but 9 isn’t allowed in octal numbers.
Explanation: Numbers starting with a 0 are octal numbers but 9 isn’t allowed in octal numbers.
7. What is the result of cmp(3, 1)?
a) 1
b) 0
c) True
d) FalseView Answer
a) 1
b) 0
c) True
d) FalseView Answer
Answer: a
Explanation: cmp(x, y) returns 1 if x > y, 0 if x == y and -1 if x < y.
Explanation: cmp(x, y) returns 1 if x > y, 0 if x == y and -1 if x < y.
8. Which of the following is incorrect?
a) float(‘inf’)
b) float(‘nan’)
c) float(’56’+’78’)
d) float(’12+34′)View Answer
a) float(‘inf’)
b) float(‘nan’)
c) float(’56’+’78’)
d) float(’12+34′)View Answer
Answer: d
Explanation: ‘+’ cannot be converted to a float.
Explanation: ‘+’ cannot be converted to a float.
9. What is the result of round(0.5) – round(-0.5)?
a) 1.0
b) 2.0
c) 0.0
d) None of the mentionedView Answer
a) 1.0
b) 2.0
c) 0.0
d) None of the mentionedView Answer
Answer: b
Explanation: Python rounds off numbers away from 0 when the number to be rounded off is exactly halfway through. round(0.5) is 1 and round(-0.5) is -1.
Explanation: Python rounds off numbers away from 0 when the number to be rounded off is exactly halfway through. round(0.5) is 1 and round(-0.5) is -1.
10. What does 3 ^ 4 evaluate to?
a) 81
b) 12
c) 0.75
d) 7View Answer
a) 81
b) 12
c) 0.75
d) 7View Answer
Answer: d
Explanation: ^ is the Binary XOR operator.
Explanation: ^ is the Binary XOR operator.