6. Array, List and Dictionary

cars = [1, 2 ,3]
print(len(cars))
 
>>3
 
print(len("hello"))
 
>>5

The len() function returns the number of items in an object.

When the object is a string, the len() function returns the number of characters in the string.

numbers = [10, 20, 30, 40]
 
for i in range(len(numbers)):
    print(i, numbers[i])

output

0 10
1 20
2 30
3 40

List:
dynamic

• size
• data type

Array:
fixed

• size
• datatype
  Array do not append or pop
  analogy: array is like calling up a restaurant for 5 adult chair and 5 baby chair. If 5 adults turn up, not enough seat for everyone.