This article entitle Python Variables is a continuation of the previous article entitled Python Comment.
Python Variables is a reserved memory location that is used to store values in a program in Python. It simply means that when you create a variable you reserved some spaces in memory.
What are Variables in Python?
In Python, the variable is a symbolic name that served as a reference or a pointer to an object. Once the object is assigned to a variable you can refer to it or call it an object in that name.
What are the 4 types of variables in Python?
Creating Variables in Python
Further, a variable can be created manually when you assign a value to it, and the equal ( = ) sign was used for assigning a value to a variable.
You can easily identify a variable and the value by just seeing the left and right of the equal ( = ) operand, the operand on the left of the equal ( = ) operator is the name of the given variable, and the right of the equal ( = ) operator is the value that stored on the given variable.
number = 200 # Creates an integer variable name = "Glenn Magada Azuelo" # Creates a string variable miles = 1200.5 # Creates a floating point variable
Printing variables in Python
Once we have already created a variable and have already assigned a value to it, we can easily print the assigned value using a print() function.
number = 200 # Creates an integer variable name = "Glenn Magada Azuelo" # Creates a string variable miles = 1200.5 # Creates a floating point variable print(number) print(name) print(miles)
200 Glenn Magada Azuelo 1200.5
Delete a variable in Python
The del statement allows us to delete references to an object number.
del num del num_a, num_b
Multiple assignments in Python
Python allows you to create multiple variables in one simultaneously.
x = y = z = 300 print (x) print (y) print (z)
300 300 300
Variable names in Python
Each variable name should be unique such as x, y, and z. or a variable should be relevant to the assigned value such as gender, name, last name, and soon.
Further, there are certain rules that could be taken care of on naming a variable in Python.
- Variable names should only contain an alphanumeric characters and underscores (0-9, A-z, and _ )
- Variable names should not be started with any special character or a number ( $, (, * %, etc. )
- The reserved keywords in Python cannot be used as a variable name.
- Variable names must start with an underscore character or a letter.
- Variable names is case sensitive it simply means that the Gender and GENDER were two different variables
value = 200 _counter = 1 programmer1 = "Jude" programmer2 = "Glenn" Age = 26 salary = 50000 print (value) print (_counter) print (programmer1) print (programmer2) print (Age) print (salary)
200 1 Jude Glenn 26 50000
Local variable in Python
Local variables are specified inside the function. It means that we cannot access that variable outside of the function.
def sum(a,b): sum = a + b return sum print(sum(20, 30))
Global variable in Python
A global variable is any variable that has been created outside of the function and can be accessed within the entire program.
a = 20 b = 30 def sum(): sum = a + b return sum print(sum())
In summary, you have read about Python Variables. We also discussed in this article what are Variables in Python, 4 types of variables, creating variables, printing variables, deleting a variable, multiple assignments, variable names, local variables, and global variables.
I hope this article about Python Variables could help you a lot to continue pursuing learning this powerful programming language.
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