📝 Variables and Objects#

Variables are containers for storing data values.

Python does note require that you declare variables, they are created once assigned with the = operator

x = 5

y = "Drexel"

print(x)

5

print(y)

Drexel

You do not need to declare the DataType of a variable it is inferred

x = 5
print(type(x))

<class 'int'>

x = 5.0
print(type(x))

<class 'float'>

x = 'Drexel'
print(type(x))

<class 'str'>

Assigning Strings#

Strings can be assigned with ” or ‘ quotes

x = "Drexel"

y = 'Drexel'

You can check if two variable have the same value using the == operator

x == y

True

Case Sensitive#

Variables are case sensitive

a = "Drexel"
A = 5
print(a)
print(A)

Drexel
5

Variable Names#

  • A variable name must start with a letter or the underscore character

  • A variable name cannot start with a number

  • A variable name can only contain alpha-numeric characters and underscores (A-z, 0-9, and _ )

  • Variable names are case-sensitive (age, Age and AGE are three different variables)

myvar = "Drexel"
my_var = "Drexel"
_my_var = "Drexel"
myVar = "Drexel"
MYVAR = "Drexel"
myvar2 = "Drexel"

Assigning Multiple Variables#

Python allows you to assign values to multiple variables in one line:

x, y, z = "Drexel", "University", "Engineering"
print(x)
print(y)
print(z)

Drexel
University
Engineering

Objects#

All Python variables are objects who have behaviors based on their datatype.

An object could be a:

  • Integer

  • String

  • Floating point number

  • Method

Or any other data type

String Objects#

When you define a string there are built-in method that can be applied.

DU = "Drexel University Engineering"

# splits based on a character
print(DU.rsplit(" "))

['Drexel', 'University', 'Engineering']

print(DU.upper())

DREXEL UNIVERSITY ENGINEERING

Float Objects#

num = 500.

num.is_integer()

True

print(type(num))

<class 'float'>