# empty

list_a = list(range(1,20,2))
print(list_a)
print(list_a[5])

list_a = [1,3,5,7,9,11,13,15,17,19]

print(list_a)
=>
[1,3,5,7,9,11,13,15,17,19]

print(list_a[5])
=>
11

len(list_a)
print( len( list_a ) )

print( len( list_a ) )
=>
10

list_x 有?個東西

print(list_x[len(list_x)-1])

len(list_x)可以知道有幾個東西

---

x = "Jack"
y = 22
print("I'm Julian.")

print("I'm" , x , ".I'm" , y , "years old.")



print(f"I'm {x}.I'm {y} years old.")

for i in range(len(lista)):
    print(f"lista[{i}] = {lista[i]}")

當i = 0時,輸出:(假設lista[0]是Jack)
lista[0] = Jack

x = [1,2,3]
x想要變成[1,2,3,4,5]
x = x + [4,5]

or

x = [1,2,3]
x.append