9oop-boolean.py

a = 200
b = 33

if b > a:
  print("b is greater than a")
else:
  print("b is not greater than a")

print("--------------------------------------------------------")

# bool() function allows you to evaluate any value, and give you True or False in return
print(bool("Hello"))
print(bool(15))

c="hi"
d=12
print(bool(c))
print(bool(d))

print("--------------------------------------------------------")

# there are not many values that evaluate to False, except empty values, such as (), [], {}, "", the number 0, and the value None. And of course the value False evaluates to False

bool(False)
bool(None)
bool(0)
bool("")
bool(())
bool([])
bool({})


print("--------------------------------------------------------")

# One more value, or object in this case, evaluates to False, and that is if you have an object that is made from a class with a __len__ function that returns 0 or False
class myclass():
  def __len__(self):
    return 0

myobj = myclass()
print(bool(myobj))

print("--------------------------------------------------------")

def myFunction():
    return True # try false
    
if myFunction():
  print("YES!")
else:
  print("NO!")