A data type<\/strong> tells Python what kind of value<\/strong> a variable is storing.<\/p>\n Example:<\/p>\n Number<\/p>\n<\/li>\n Text<\/p>\n<\/li>\n True or False<\/p>\n<\/li>\n<\/ul>\n Python understands data types automatically.<\/p>\n Python has many data types, but beginners should first learn these:<\/p>\n Integer (int)<\/p>\n<\/li>\n Float (float)<\/p>\n<\/li>\n String (str)<\/p>\n<\/li>\n Boolean (bool)<\/p>\n<\/li>\n<\/ol>\n An integer<\/strong> is a whole number<\/strong>. print<\/span>(age) A float<\/strong> is a number with decimal point<\/strong>.<\/p>\n print<\/span>(price) A string<\/strong> is text<\/strong>. print<\/span>(name) print<\/span>(first + \" \"<\/span> + second) A boolean<\/strong> has only two values:<\/p>\n Used for decisions.<\/p>\n print<\/span>(is_active) You can check the data type of a variable.<\/p>\n name = \"Amit\"<\/span> Sometimes we need to change one data type to another<\/strong>.<\/p>\n Input from user is always string<\/strong>.<\/p>\n Convert it:<\/p>\n print<\/span>(\"Sum:\"<\/span>, a + b) print<\/span>(\"Name:\"<\/span>, name) \u2714 Correct:<\/p>\n \u2714 Correct:<\/p>\n \u2714 Data types tell value type This chapter is ideal for:<\/p>\n Python beginner books<\/p>\n<\/li>\n School & college students<\/p>\n<\/li>\n Self-learners<\/p>\n<\/li>\n<\/ul>\n If you want next, I can write:<\/p>\n\n
2. Common Data Types in Python<\/h2>\n
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3. Integer (int)<\/h2>\n
It can be positive, negative, or zero.<\/p>\nExamples<\/h3>\n
age = 25<\/span>
\ncount = -10<\/span>
\nnumber = 0<\/span><\/p>\n
\nprint<\/span>(count)
\nprint<\/span>(number)
\n<\/code><\/div>\n<\/div>\n4. Float (float)<\/h2>\n
Examples<\/h3>\n
price = 19.99<\/span>
\npi = 3.14<\/span><\/p>\n
\nprint<\/span>(pi)
\n<\/code><\/div>\n<\/div>\n5. String (str)<\/h2>\n
It is written inside quotes (\" \"<\/code> or ' '<\/code>).<\/p>\nExamples<\/h3>\n
name = \"Python\"<\/span>
\ncity = 'Delhi'<\/span><\/p>\n
\nprint<\/span>(city)
\n<\/code><\/div>\n<\/div>\nJoining Strings<\/h3>\n
first = \"Hello\"<\/span>
\nsecond = \"World\"<\/span><\/p>\n
\n<\/code><\/div>\n<\/div>\nLength of a String<\/h3>\n
word = \"Python\"<\/span>
\nprint<\/span>(len<\/span>(word))
\n<\/code><\/div>\n<\/div>\n6. Boolean (bool)<\/h2>\n
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True<\/code><\/p>\n<\/li>\nFalse<\/code><\/p>\n<\/li>\n<\/ul>\nExamples<\/h3>\n
is_active = True<\/span>
\nis_raining = False<\/span><\/p>\n
\nprint<\/span>(is_raining)
\n<\/code><\/div>\n<\/div>\n7. Checking Data Type (
type()<\/code>)<\/h2>\nExample<\/h3>\n
x = 10<\/span>
\nprint<\/span>(type<\/span>(x))<\/p>\n
\nprint<\/span>(type<\/span>(name))
\n<\/code><\/div>\n<\/div>\n8. Type Conversion (Type Casting)<\/h2>\n
String to Integer<\/h3>\n
x = \"10\"<\/span>
\ny = int<\/span>(x)
\nprint<\/span>(y + 5<\/span>)
\n<\/code><\/div>\n<\/div>\nInteger to Float<\/h3>\n
a = 5<\/span>
\nb = float<\/span>(a)
\nprint<\/span>(b)
\n<\/code><\/div>\n<\/div>\nNumber to String<\/h3>\n
age = 20<\/span>
\nprint<\/span>(\"Age is \"<\/span> + str<\/span>(age))
\n<\/code><\/div>\n<\/div>\n9. Input and Data Types<\/h2>\n
Example<\/h3>\n
age = input<\/span>(\"Enter age: \"<\/span>)
\nprint<\/span>(type<\/span>(age))
\n<\/code><\/div>\n<\/div>\nage = int<\/span>(input<\/span>(\"Enter age: \"<\/span>))
\nprint<\/span>(type<\/span>(age))
\n<\/code><\/div>\n<\/div>\n10. Simple Practice Examples<\/h2>\n
Example 1: Add Two Numbers<\/h3>\n
a = int<\/span>(input<\/span>(\"Enter first number: \"<\/span>))
\nb = int<\/span>(input<\/span>(\"Enter second number: \"<\/span>))<\/p>\n
\n<\/code><\/div>\n<\/div>\nExample 2: Print User Details<\/h3>\n
name = input<\/span>(\"Enter name: \"<\/span>)
\nage = int<\/span>(input<\/span>(\"Enter age: \"<\/span>))<\/p>\n
\nprint<\/span>(\"Age:\"<\/span>, age)
\n<\/code><\/div>\n<\/div>\n11. Common Beginner Mistakes<\/h2>\n
\u274c Mixing Text and Number<\/h3>\n
age = 20<\/span>
\nprint<\/span>(\"Age is \"<\/span> + age)
\n<\/code><\/div>\n<\/div>\nprint<\/span>(\"Age is\"<\/span>, age)
\n<\/code><\/div>\n<\/div>\n\u274c Forgetting Conversion<\/h3>\n
num = input<\/span>(\"Enter number: \"<\/span>)
\nprint<\/span>(num + 5<\/span>)
\n<\/code><\/div>\n<\/div>\nnum = int<\/span>(input<\/span>(\"Enter number: \"<\/span>))
\nprint<\/span>(num + 5<\/span>)
\n<\/code><\/div>\n<\/div>\n12. Summary (Python Data Types)<\/h2>\n
\u2714 Common types: int, float, str, bool
\u2714 Python detects type automatically
\u2714 type()<\/code> checks data type
\u2714 Conversion is important<\/p>\n\ud83d\udcd8 Perfect for Beginner eBook<\/h3>\n
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