pybool

"""
Boolean represent two values 'True' or 'False'.
"""

if name == 'main':
# When you run a condition in an if statement, Python returns True or False:
a = 200
b = 33
if a > b:
print("b is greater than a")
else:
print("b is not greater than a")

Evaluate Values and Variables.

'''
The bool() function allows you to evaluate any value, and give you True or False in return
Most of the values are true : string,int(except '0'),list,'True'...
Some Values are false : False,0,"",(),[],{}.
'''
x = 'hello'
y = 15
print(bool(x))
print(bool(y))

some special object are false.

class subway:
def len(self):
return 0

obj = subway()
print(bool(obj))

'''
This phenomenon of the false is not dut to the object itself but it's dut to the len() function return a '0',
if you change it to return a '1', it will become to true.
'''

class car:
def len(self):
return 1

obj = car()
print(bool(obj))

Python also has many built-in functions that return a boolean value, like the isinstance() function,

which can be used to determine if an object is of a certain data type:

x = 200
print(isinstance(x, int))