In this ppt you learn about datatypes of Python.

2. Data types
Number Sequence
None Set
Integer Float Complex
String Tuple List
Dictionary

3. Number data types store numeric values.
They are immutable data types, means that
changing the value of a number data type
results in a newly allocated object.

4. There are three numeric types to
present numbers-
Integer
Float
Complex
1
2
3

5. An integer is a whole number with no decimal
places. For example, 1 is an integer, but 1.0 isn’t.
The name for the integer data type is int.
Ex- type(1) <class 'int'>

6. A floating-point number, or float for short, is a
number with a decimal place. 1.0 is a floating-point
number, as is -2.75.
Ex- type(1.0) <class 'float'>

7. complex fare of the form a + bJ, where a and b are
floats and J (or j) represents the square root of -1
(which is an imaginary number). The real part of the
number is a, and the imaginary part is b. Complex
numbers are not used much in Python programming.
Ex- type(1+2j) <class 'float'>

8. The None keyword is used to define a null
value, or no value at all.
None is not the same as 0, False, or an
empty string. None is a data type of its own
(NoneType) and only None can be None.

9. x = None
if x:
print("Do you think None is True?")
elif x is False:
print ("Do you think None is False?")
else:
print("None is not True, or False, None is just None...")
Output-None is not True, or False, None is just None...

10. Sequences allow you to store multiple
values in an organized and efficient
fashion

11. String are arrays of bytes representing Unicode
characters. A string is a collection of one or
more characters put in a single quote, double-
quote or triple quote. In python there is no
character data type, a character is a string of
length one. It is represented by str class.

12. To Access characters of String
String1 = “Python"
print("Initial String: ")
print(String1)
print("nFirst character of
String is: ")
print(String1[0])
Output-
Initial String:
Python
Output-
First character
of String is: P

13. A tuple is also a heterogeneous collection of
python objects seperated by commas .It means
object of different data types can consist of
tuple.
Ex- first_tuple=(2,3,4,6)

14. Python has two built-in methods that you can use on tuples.
 Count()- Returns the number of times a specified value
occurs in a tuple.
 Index()- Searches the tuple for a specified value and
retuns the position of where it was found.

15. It is a heterogeneous collection of items of varied
data types. For Ex, a list object can store files in a
folder or the employee data in a company etc.
Ex- List=[1,2,3,4]
O/P-List=[“Annu”, ”Mini”, 33, 44]
//Heterogeneous collection of items

16. Insert()
Remove()
Count()
Clear()
Add an element at the specified position
Removes the fist item with the specified value.
Returns the number of elements with the
specified value.
Removes all the elements from the list.

17. A set is an unordered collection of unique and immutable
objects. Its definition starts with enclosed braces {} having
its items separated by commas inside.
Creating a set-
Set1={“BMW”, “Ferrari”, “Tesla”, “Ford”, ”Honda”}
Set2={Honda”,”Yamaha”,”Kawasaki”,20,40}

18.  Union()- Return a set that contatins all items from both
sets, duplicates are excluded.
 Intersection()- The intersection() method returns a set that
contains the similarity between two or more sets.
 Difference()- Return the difference two sets which is also
a set.
 Issubset()- The issubset() method returns True if all items
in the items in the set exists in the specidied set,
otherwise it return false.

19. A dictionary in Python is an unordered collection of key-value pairs.
Accessing values
Print(Dict1[Roll_No])
// output Dict1[Roll_No]) : 101
Print(Dict1[‘Name’])
// output Dict1[‘Name’]) : Kajal
Ex- Dict1= {
“Roll_No” : 101
“Name” : “Kajal”,
“Caste” : “Soni”,
“Class” : 12
}

20.  Get()-Returns the value of the specified key.
 Update()- Updates the dictionary with the specified key-vlaue
pairs.
 Pop()- Removes the element with the specified key.
 Copy()- Returns a copy of the dictionary.