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प्रश्न
Discuss in detail Tokens in Python.
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उत्तर
Python breaks each logical line into a sequence of elementary lexical components known as Token.
The normal token types are
- Identifiers
- Keywords
- Operators
- Delimiters and
- Literals.
Identifiers:
- An Identifier is a name used to identify a variable, function, class, module, or object.
- An identifier must start with an alphabet
(A..Z or a..z) or underscore (_). Identifiers may contain digits (0 .. 9). „ - Python identifiers are case sensitive i.e. uppercase and lowercase letters are distinct. Identifiers must not be a python keyword.
- Python does not allow punctuation characters such as %,$, @, etc., within identifiers.
Keywords:
Keywords are special words used by Python interpreters to recognize the structure of the program. As these words have specific meanings for interpreters, they cannot be used for any other purpose.
Operators:
- In computer programming languages operators are special symbols that represent computations, conditional matching, etc.
- The value of an operator used is called operands.
- Operators are categorized as Arithmetic, Relational, Logical, Assignment, etc. Value and variables when used with the operator are known as operands
Delimiters:
Python uses the symbols and symbol combinations as delimiters in expressions, lists, dictionaries, and strings.
Following are the delimiters knew as operands.
| ( | ) | ] | { | } |
| , | : | . | ' | ; |
Literals:
Literal is raw data given in a variable or constant. In Python, there are various types of literals.
- Numeric
- String
- Boolean
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संबंधित प्रश्न
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What is a literal?
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What are string literals? Explain.
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a + b % c * d - e
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He has written the following statement, which in incorrect.
x=+2;
What will be the correct statement?
- x+=2;
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- x=x+2;
Consider the following program segment in which the statements are jumbled, choose the correct order of statements to swap two variables using the third variable.
void swap(int a, int b)
{ a=b; -> (1)
b=t; -> (2)
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t=a; -> (4)
}
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Class name: Bank
Member variables:
double p - stores the principal amount
double n - stores the time period in years
double r - stores the rate of interest
double a - stores the amount
member methods:
void accept () - input values for p and n using Scanner class methods only.
void calculate () - calculate the amount based on the following conditions:
| Time in (Year) | Rate % |
| Upto `1/2` | 9 |
| >`1/2` to 1 year | 10 |
| > 1 to 3 year | 11 |
| > 3year | 12 |
`a = p (1+r/100)^n`
void display () - display the details in the given format.
Write the main method to create an object and call the above methods.
