function definition def test()

def test(x):
    y=2*x+1
    return y
print(test(3))

Simple calculation 
def test(x):
    y =2*x+1
     return y
t=input('>>>')
y=test(int(t))
print(y)

while True
    if cpu>90%
        connect to the server
        send email
        close the connection
    if memory>90%
        connect to the server
        send email
        close the connection
    if hard disk>90%
        connect to the server
        send email
        The use of closing the connection  


function simplifies the utilization of the code 
...
 def Email Alert: (content)
        connect to the server
        send email
        close the connection
if cpu>90%
Email reminder (cpu alarm)
if memory>90%
Email reminder (memory alarm)
if hard disk>90%
Email reminder (hard disk alarm)