Python Tutorials
Python Introduction
Python Get Started
Python Syntax
Python Comments
Python Variables
Python Data Types
Python Casting
Python Strings
Python Booleans
Python Operators
Python Lists
Python Tuples
Python Sets
Python Dictionaries
Python If...Else
Python While Loops
Python For Loops
Python Functions
Python Lambda
Python Arrays
Python Classes/Objects
Python Inheritance
Python Iterators
Python Scope
Python Modules
Python Dates
Python Math
Python JSON
Python RegEx
Python PIP
Python Try..Except
Python User Input
Python String Formatting
Python File Handling
Python File Handling
Python Read Files
Python Create/Write Files
Python Delete Files
Python Modules
Python Numpy
Python Pandas
Python SciPy
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Python Booleans
Booleans represent one of two numbers: True or False.
Boolean Values
In the system you usually need to know whether the statement is true or false.
You can check any statement in Python, and get one of two answers, True or False.
When you compare the two values, the speech is tested and Python returns the Boolean response:
Example
print(10 > 9)
print(10 == 9)
print(10 < 9)
If you use the status in the statement if, Python returns True or False:
Example
Print a message based on whether the condition is True or False:
a = 200
b = 33
if b > a:
print("b is greater than a")
else:
print("b is not greater than a")
Evaluate Values and Variables
The bool() function lets you check any value, and gives you True or False as a refund,
Example
Evaluate a string and a number:
print(bool("Hello"))
print(bool(15))
Example
Evaluate two variables:
x = "Hello"
y = 15
print(bool(x))
print(bool(y))
Most Values are True
Almost any value is tested to be True if it contains some kind of content.
Any character unit is True, with the exception of blank cables.
Any number is True, except for 0.
Any list, tuple, set, and dictionary is True, except for the blanks.
Example
The following will return True:
bool("abc")
bool(123)
bool(["apple", "cherry", "banana"])
Some Values are False
In fact, there are not many values that check False, other than empty numbers, such as (), [], {}, "", the number 0, and the value None. And then False value checks False.
Example
The following will return False:
bool(False)
bool(None)
bool(0)
bool("")
bool(())
bool([])
bool({})
One more value, or item in this case, checks that it is False, and that is if you have something made from the section with the function __len__ which returns 0 or False:
Example
class myclass():
def __len__(self):
return 0
myobj = myclass()
print(bool(myobj))
Functions can return a Boolean
You can create Boolean Return values:
Example
Print the answer of a function:
def myFunction() :
return True
print(myFunction())
You can create a code based on the Boolean response function:
Example
Print "YES!" if the function returns True, otherwise print "NO!":
def myFunction() :
return True
if myFunction():
print("YES!")
else:
print("NO!")
Python also has a number of built-in functions that return the boolean value, such as an isinstance() function, which can be used to determine if an object is a specific type of data:
Example
Check if an object is an integer or not:
x = 200
print(isinstance(x, int))