Python-CH01L04-Presentation.pptx

Python Data Types
Lesson 1.4
CHAPTER
1

How do you display text, strings,
and values of variables?

Computer only
understands binary
numbers 0’s and 1’s.

Computer converts strings,
numbers, and images in
binary before processing.

Data Types
In This Lesson
Numeric
Sequence
Boolean
Set
Dictionary

Data Type
Data types are the classification or
categorization of data items.

Data Type
It represents the kind of value that tells what
operations can be performed on a particular data.

Python Built-In Data Types
• Numeric
• Sequence Type
• Boolean
• Set
• Dictionary

Answer This
What is a data type?

Numeric
Numeric data type represent the data
which has numeric value.
Numeric data type represents the data

Numeric
Numeric data type represent the data
Numeric value can be integer, floating
number or even complex numbers.

Integer
Int, or integer, is a whole number, positive or
negative, without decimals or fractions, and
no limit to how long an integer value.

To check in Python:
num = 2
print(type(num))
<class ‘int’>
integer
data type

type() Function
The type( ) function is used to determine the
type of data type.
num = 2
print(type(num))
Example:

Answer This
What is the function of the
numeric data type?

Delimiter
Delimiter is a sequence of one or more characters used
to specify the boundary between separate, independent
regions in plain text or other data streams.

Delimiter
In Python, it does allow an underscore _ as a delimiter.
x = 1234_5678_90
print(x)
1234567890

Answer This
How does the computer interpret data?

Prefixing Integers
• Binary
• Octal
• Hexadecimal
• Decimal

Binary
When you enter a binary number, start with the prefix ‘0b’
(that’s a zero followed by a minuscule b).
x = 0b101
print(x) 5
The 0b101 is the same as the binary numbers 101
and it is equivalent to 5.

Binary Table
128 64 32 16 8 4 2 1
27 26 25 24 23 22 21 20
1 0 0 1 1 1 0 1
10011101 is equivalent to 157 in decimal
128 + 16 + 8 + 4 + 1 = 157

Binary
x = 0b10011101
print(x) 157

To convert a decimal number to binary value:
x = 194
print(bin(x))
•Use bin() function to convert a decimal to binary value
0b11000010

Octal
•Octal contains eight digits and uses the function oct( ) to
convert numbers to octal and with a prefix of ‘0o’ or 0O
(zero and letter O).
• The eight digits in Octal are 0, 1, 2, 3, 4, 5, 6, 7.
x = 0o143
print(x)
99

Convert Octal to Binary and to Decimal
x = 0o143
print("Octal: " + oct(x))
print("Converted to Decimal: ", x)
print("Converted to Binary: ",bin(x))
Octal: 0o143
Converted to Decimal: 99
Converted to Binary: 0b1100011

Hexadecimal
•Hexadecimal contains 16 numbers and letters, from 0 – 9
and the letters A – F. A is 10, B is 11, C is 12, D is 13, E is
14 and F is 15.
•Hexadecimal has a prefix ‘0x’ or ‘0X’ (number 0 and letter
X) with the function hex( ).
•Hexadecimal 0x25C is equal to 604 in decimal.

Convert Hexadecimal to Decimal, Binary, and Octal
x = 0x25C
print("Hexadecimal: ", hex(x))
print("Converted to Decimal: ", x)
print("Converted to Binary: ",bin(x))
print("Converted to Octal: ",oct(x))
Hexadecimal: 0x25c
Converted to Decimal: 604
Converted to Binary: 0b1001011100
Converted to Octal: 0o1134

Decimal
•A number base is the number of digits that a system of
counting uses to represent numerical values
•In decimal, the digits 0, 1, 2, 3, 4, 5, 6, 7, 8, and 9
represent every possible value.

Decimal Values
10000 1000 100 10 1 10000
104 103 102 101 100 104

Note:
•Binary – with bin( ) function and prefix of ‘0b’
•Octal – with oct( ) function and prefix of ‘0o’
•Hexadecimal - with hex( ) function and prefix of ‘0x’

Create a program to convert an integer
(decimal) value to Binary, Octal and
Hexadecimal numbers.
Exercise

Float
•The float data type can represent floating point numbers,
up to 15 decimal places.
•Any number with decimal or fractional number is
considered a float type of data in Python.
x = 1.43
print(type(x)) <class‘float’>

Float
x = float(5)
print(type(x))
y = int(1.43)
print(type(y))
<class 'float'>
<class 'int'>

Float
x = float(2e400)
print(x) ’inf’

Float
x = float(3.1516e2)
print(x)
315.16
x = float(3.1516e-2)
print(x)
0.0315.16

Arithmetic Operators and Expressions
In this section, you’ll learn how to do
basic arithmetic, such as addition,
subtraction, multiplication, and
with numbers in Python. Along the
you’ll learn some conventions for
writing mathematical expressions in
code.

Addition
Addition is performed with
the + operator:
1 + 1 = print (1+1)

The two numbers on either side of the + operator
are called operands. In the above example, both
operands are integers, but operands don’t need to
be the same type.
You can add an int to a float with no problem:

Exercise:
PRINT ADDITION OF
INT Data type and FLOAT
Data Type

Now, try to add 5 different
float numbers.

Now, try to add 5 different
float numbers with variable
declaration.

Just like adding two integers,
subtracting two integers always results
in an int. Whenever one of the
operands is a float, the result is also
a float.
Just like adding two integers, subtracting two integers always results in an int. Whenever one of the operands is a float, the result is also a float.

Exercise:
Now, calculate negative terms
using Python.

Exercise:
Now, calculate multiplication using
Python.

Exercise:
Now, calculate division using
Python.

Create a program to find the sum, difference, product
and quotient of the following floating numbers.
Exercise

Complex Numbers
•It is used to represent imaginary numbers in a
complex pair.
•It is a number with real and imaginary components.
•The character ‘j’ is used to express the imaginary part of
the number.
x = 2j
print((type)x) <class complex>

Convert an int or float to complex
x = 2
y = 5.3
print(complex(x))
print(complex(y))
(2+0j)
(5.3+0j)

Adding Complex Numbers
x = 2j
y = 3 + 1j
print(x + y)
(3.3j)
x = 2j
y = 3 + 1j
z = 4j + 2 + 2j
print(x + y + z)
(5+9j)

Create a program to get the sum, difference, product
and quotient of the following complex numbers:
a. 13 – 5j, 14 + 42j – 3, 9j + 2
b. 6 + 7j – 2, 5j – 13 + 6j
Exercise

Sequence
•Sequences is an ordered collection of similar data types.
It allows to store multiple values in an organized and
efficient manner.
•Built-in sequence data types: string, list, and tuple

String
•A string value is a collection of one or more characters
put in single, double or triple quotes.
•An array of bytes representing Unicode characters
•It uses the str class.

Example
string1 = "H&D Information Technology Inc."
print(type(string1))
print(string1)
<class 'str'>
H&D Information Technology Inc.

Using Double Quote
string1 = "H&D Information Technology Inc.”
string2 = “Welcome to Python Programming"
print(string1)
print(string2)
H&D Information Technology Inc.
Welcome to Python Programming

Using Triple Quote
string3 = '''
Welcome to
Python
Programming!
'''
print(string3)
print(type(string3))
Welcome to
Python
Programming!
<class ‘str’>

List
•A list object is an ordered collection of one or
more data items.
•It is represented by list class.
•Lists can be one value, multiple values or
multi-dimensional.

One Value List
list = ["David"]
print("H&D Employees")
print(list)
print(type(list))
H&D Employees
['David']
<class 'list'>

Multiple Values List
list = ["David", "Henry", "William", "Jun"]
print(list)
print(type(list))
H&D Employees
['David', 'Henry', 'William', 'Jun']
<class 'list'>

Multi-dimensional List
list = ["David", "Henry", "William“], ["Jun“,
“Dennis”, “Rommel", "Francis"]
print(list)
print(type(list))
H&D Employees
[['David', 'Henry', 'William'], ['Jun', 'Dennis'], ['Arman', 'Rommel',
'Francis']]
<class 'list'>

Lists can also be used for a group of numbers
list = [[95,68,69,88],[100,230],[-2,3,10]]
print("Integers")
print(list)
print(type(list))
Integers
[[95,68,69,88], [100, 230], [-2,3,10]]
<class 'list'>

Accessing Elements on the Lists
•List items are indexed and can access them by referring to
the index number.
•The items on the lists has an index of 0 or List[0].
print(list[0])
David

Negative Indexing
•A negative index will display the element in the list
starting from the last index.
print(list[-1])
Jun

Range of Index
Syntax:
list[startingindex:rangeofindex]
Example:
print(list[0:2])
Output:
['David', 'Henry']

Example
print(list[ :3])
Displays: ['David', 'Henry', 'William']
print(list[1: ])
Displays:['Henry', 'William', 'Jun']
print(list[ : ])
Displays:['David', 'Henry', 'William', 'Jun']

list[3] = "Juanito"
print(list)
['David', 'Henry', 'William', 'Juanito']

Unpacking
coordinates = [1, 2, 3]
x, y, z = coordinates
print(x)
print(y)
print(z)
1
2
3

Unpacking
Grade = [98, 91, 96]
gr1, gr2, gr3 = Grade
print(gr1)
print(gr2)
print(gr3)
98
91
96

Tuple
•Tuple is also an ordered collection of Python objects.
•Tuples are immutable, cannot be modified after it is
created.
•It is represented by tuple class.

Tuple
•A tuple uses a parentheses ( ).
•Tuples can be a group of integers, strings, lists or any
elements and of any data type.

Example
Grades = (98, 87, 95, 93, 85)
print(Grades)
print(type(Grades))
(98, 87, 95, 93, 85)
<class 'tuple'>

Example
employees = ["David", "Henry", "William",
"Jun"]
print(tuple(employees))
H&D Employees
('David', 'Henry', 'William', 'Jun')

Nested Tuple
Tuples1 = ((99, 89, 97, 91), ("math",
"science"))
print(Tuples1)
((99, 89, 97, 91), ('math', 'science'))

Nested Tuple
grade = (99, 89, 97, 91)
subject = ("math", "science")
print(grade, subject)
(99, 89, 97, 91) ('math', 'science')

Nested Tuple
company = tuple("happyd")
print(company)
('h', 'a', 'p', 'p', 'y', 'd')

Create a one tuple program named as studgrades to
display the following output:
cesar = 95
francis = 86
mawee = 76
austin = 90
cynthia = 92
Exercise

Boolean
•Boolean data type has two built-in values, either a
True or False.
•It is determined by the class bool.
x = 90
y = 54
print(x == y)
print(x > y)
print(x < y)
False
True
False

Example
x = 5
y = ""
z = " "
i = 0
j = "hello"
print(bool(x))
print(bool(y))
print(bool(z))
print(bool(i))
print(bool(j))
True
False
True
False
True

Create a program to identify if the first
element in a list is equal to 5.
Exercise

Set
•An unordered collection of data type that is iterable,
mutable and has no duplicate elements.
•It contains one or more items, not necessarily of the
same type, which are separated by comma and enclosed
in curly brackets { }.

Example
employees = {"david", "henry", "william", "jun"}
salary = {100, 200, 500, 700}
print(employees)
print(salary)
print(type(employees))
print(type(salary))
{'david', 'henry', 'william', 'jun'}
{200, 100, 700, 500}
<class 'set'>
<class 'set'>

Example
employees = {"david", “david”, "henry", "william",
"jun"}
salary = {100, 200, 500, 700}
print(employees)
print(salary)
{'david', 'william', 'jun‘, 'henry'}
{200, 100, 700, 500}

Example
values = {"David", 30, "December 8, 1990", "Male",
10000.74, True}
print(values)
print(type(values))
{'David', True, 10000.74, 'December 8, 1990', 'Male', 30}
<class 'set'>

Example
set1 = set("happyd")
set2 = set([1,2,3,4,5])
set3 = set(("a","b","c","d","e"))
print(set1)
print(set2)
print(set3)
{'y', 'p', 'a', 'h', 'd'}
{1, 2, 3, 4, 5}
{'e', 'b', 'c', 'a', 'd'}

Modifying Sets
• Add()
• Update()
• Discard()
• Remove()
• Clear()

Removing/deleting element/s in a set
set1 = {1,2,3}
set2 = {4,5,6}
set3 = {7,8,9}
set4 = {3,4,9}
set1.add(10)
set2.update([1,2,20])
set3.discard(9)
set4.remove(3)
print("Add: ",set1)
print("Update: ",set2)
print("Discard: ",set3)
print("Remove: ",set4)
Add: {10, 1, 2, 3}
Update: {1, 2, 4, 5, 6, 20}
Discard: {8, 7}
Remove: {9, 4}

Dictionary
•An unordered collection of data values, used to store
data values.
•Dictionary holds key:value pair.
•Key-value is provided in the dictionary to make it
more optimized.
•Each key-value pair in a Dictionary is separated by a colon :,
whereas each key is separated by a ‘comma’.

Declaring Dictionary Object
Syntax:
dict = {key1:value1, key2:value2}

Example
dictionary1 = {1:"UP", 2:"ADMU", 3:"DLSU",
4:"UST"}
dictionary2 = {"PHILIPPINES":"Peso",
"USA":"Dollar", "THAILAND":"Baht"}
print(dictionary1)
print(dictionary2)
print(type(dictionary1))
print(type(dictionary2))

Output
{1: 'UP', 2: 'ADMU', 3: 'DLSU', 4: 'UST'}
{'PHILIPPINES': 'Peso', 'USA': 'Dollar', 'THAILAND':
'Baht'}
<class 'dict'>
<class 'dict'>

Dictionary using built-in function dict( )
dictionary = dict({"Director":"David",
"Manager":"Jun","Marketing":"Dennis"})
print(dictionary)
{'Director': 'David', 'Manager': 'Jun',
'Marketing': 'Dennis'}

Dictionary using items in pairs
dictionary = dict([("Director","David"),
("Manager","Jun"),("Marketing","Dennis")])
print(dictionary)
{'Director': 'David', 'Manager': 'Jun',
'Marketing': 'Dennis'}

Nested Dictionary
Nested dictionary is use when you have another
collection or group inside a dictionary.

Example
{'Management': {1: 'David', 2: 'Jun'}, 'Marketing': 'Dennis'}
dictionary = {
"Management":
{
1:"David",
2:"Jun"
},
"Marketing":"Dennis"}
print(dictionary)

Create a program to display the name
and grades of 5 students. Program
must contains two lists: students and
grades.
QUIZ – HANDS-ON (LIST)

Create a program using the unpacking
to display the sum and average of five
input grades.
QUIZ – HANDS-ON

QUIZ – HANDS-ON
Given the following set:
grades = {96,76,82,90,88}
Create a program to display the following:
{96, 80, 82, 74, 88, 76, 93}

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