Part3- Python Fundamentals | Start from the basics

 

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In the previous article we learnt about some types of tokens. In this article, we shall continue to learn about different types of tokens.

 3. Literals/Values: Literals (often referred to as constant Values) are data items that have a fixed value. Python allows several kinds of literals:

                1. String literals                        2. Numeric literals                        3. Boolean literals                            4. Special Literal - None          5. Literal Collections

    i) String Literals: The text enclosed in quotes forms a string literal in Python. For example, 'a', 'xyz', "pqrs", etc. all are string literals. Unlike many other languages, both single character("a", 'x') as well as multiple characters("abc", "xyz") enclosed in quotes are treated as string literals.

*In Python, string literals can be declared under both single as well as double quotes, but not in triple quotes about which we shall learn afterwards.

Example: 'Vishnu', "friends", "SiStEr", '12345', "62996",etc.

Python also allows non-graphic characters as string literals(values); Non-graphic characters are those characters that cannot be typed directly from the keyboard i.e. backspace, tab, carriage return, etc. These non-graphic characters can be represented by using escape sequences. An escape sequence is represented by a backslash(\) followed  by one or more characters.

The following table gives a listing of esquences:

Though some characters like\  '  "   can be typed from the keyboard but if used without escape sequence, these carry a special meaning. So, if they are to be typed just as a symbol and not for a specific purpose, then escape sequence should be used.

            String Types in Python

    Python allows you to have two string types:

1. Single-line string

2. Multi-line string

We shall learn about these in the next article.