Python Tokens

Q. 8 Operator Precedence Table
Ans.

Q. 9 What is the difference between is and in operator.
Ans.

is and is not are the identity operators in Python. They are used to check if two values (or variables) are located on the same part of the memory. Two variables that are equal does not imply that they are identical or located at same memory location.
in and not in are the membership operators in Python. They are used to test whether a value or variable is found in a sequence (string, list, tuple, set and dictionary).
In a dictionary we can only test for presence of key, not the value.

 Q. 10 How are the following two expressions different?

1. 1. ans = 9
   2. ans == 9

Ans. One is using assignment operator and other is using comparison operator.

Q. 11 Write one difference between / and // operator.
Ans.  / is the floating point division operator which divides and gives floating value.
// is the integer division operator which discards the decimal value after decimal point and gives only the quotient.
e.g.  next question

Q. 12 Evaluate the following if a = 15 , b = 3

1. a / b
2. a // b

Ans.

1. 3
2. 5

Q. 13 Which of these is invalid identifier?

1. 1. $age
   2. 1percent
   3. _
   4. A
   5. and
   6. While

Ans. a, b,e are invalid. Remaining are valid

Q. 14 Which of the following are valid comments?

1. 1. /* comment */
   2. */comment*/
   3. ‘’’ comment
   4. //comment

Ans. Comments a and d is valid.

Q. 15 Identify which Python token are these?

1. 1. and
   2. _value
   3. True
   4. <=

Ans.

1. 1. Keyword
   2. Identifiers
   3. Boolean literals
   4. Relational Operator

Q. 16 Identify which of the following as valid variable names, state reason if invalid.

1. 1. _ 100
   2. 1
   3. break
   4. A463
   5. T 204

Ans.

1. 1. Valid as it begins with (underscore).
   2. Invalid, dot (.) is not allowed.
   3. Invalid, as break is a keyword.
   4. Valid
   5. Invalid, space is not allowed.

Q. 17 Determine the type of literals below.

1. 1. -19
   2. 0o12
   3. 0XFACE

Ans.

1. Decimal integer literals
2. Octal Integer Literals
3. Hexadecimal Integer Literals

Q. 18 If i = 3, j = 2 what is the result of following expressions?

1. 1. i + 5 >= j – 6
   2. j * 10 < i ** 2
   3. i < j + 5 > j ** 4

Ans.

1. 1. True
   2. False
   3. False

Q. 19 Identify errors in following statements and correct them:

1. 1. number = 5,000
   2. byte x= = 3
   3. x/10 = y
   4. number = +20

Ans. correct statement:

1. 1. number = 5000
   2. byte = 3
   3. y= x/10
   4. number += 20

Q. 20 Identify the following literals:

1. 1. 23
   2. True
   3. ‘b’
   4. “a”

Ans.

1. Floating point literal
2. Boolean literal
3. Character literal
4. String literal

Q. 21 Identify the Valid and invalid Operators?

1. <>
2. <=
3. //=
4. &

Ans.

1. Invalid
2. Valid
3. Valid
4. Valid