Getting Started With Python PyStart(Data Types)

Davisonyeas — Sun, 03 Apr 2022 03:38:20 +0000

1.0 DATA TYPES
In programming, data type is an important concept. Just as we discussed previously on variables, Variables can store different types.
Python has many built-in data types, such as

Text type : str
Numeric type : int, float, complex
Boolean type : True or False
Set
Sequence type : List, Tuple, Range

x = "Davis"
# x is a string data type

y = 4; 
# y is an int data type

z = 7.5;
# z is a float type

To display the result of this, We make use of the print() built-in function;

print(x)

print(y)

print(z)

Output
Davis
4
7.5

Note:
We defined a var x = "Davis"; just as we have in other programming languages like Java, Python automatically detects the data type of the value)

Also, when declaring variable names, we take note of keywords, there are some reserved keywords in python that shouldn't be used as a variable name, some of such keywords includes return, is, continue, def, finally, and a few other words. Read further on Python keywords Click here for Python keywords

1.1 Checking the data type of the variable
It is important that we know how to check data types in Python, this is a basic concept that will come in handy when we get to more advanced topics like Data Preprocessing and Analysis.
We check the type of our data by using the type() method.

print(type(x))

print(type(y))

Output
int
str

Getting Started With Python PyStart(Variables)

Davisonyeas — Thu, 31 Mar 2022 23:49:58 +0000

1.0 VARIABLES
Variables are containers for storing data values. Python has no command for declaring variable. A variable is created the moment you assign a value to it.
For example,

x = 4;

y = "Davis"

To display the result of this, We make use of the print() built-in function;

print(x)

print(y)

Output
4
Davis

Note:
In Python, we do not have to say x = int 4; just as we have in other programming languages like Java, Python automatically detects the data type of the value)

print(type(x))

print(type(y))

Output
int
str

1.2 Python Variable Naming Rules
The following are the some good, bad and different naming conventions.
The Good shows some good naming conventions that can be used and that is accepted by developers.
The Bad shows some bad practices that shouldn't be used while coding.
The Different shows that each individual variable is independent of the others, they all have the same spelling but the fact that some are capital letters and some aren't. They are all different.

Good: spam  eggs  spam23  _speed

Bad: 23spam  #sign   var.12

Different: spam   Spam   SPAM

DEV Community: Davisonyeas

Getting Started With Python PyStart(Data Types)

Getting Started With Python PyStart(Variables)