Data structures and Loop

Data structures: list, tuple, dict, set 

<Sequence>

: A type of data sturctures.

Mutable sequence: list

Immutable sequence: tuple, str

<List>

notation: []

index start from 0.

Ex) 

t1=[42,1024, 23]

print(t1[0])                42

print(t1[1])              1024

t1[2]=7

print(t1)                 [42,1024,7]

Ex)

t=[42,1024, 23, 6, 28, 496]

print(t[1:4])               [1024,23,6]            (includes start point and exclude end point.)

print(t[3:])                 [6, 28, 496]           (includes start point to end.)

print(t[:2])                 [42, 1024]            (includes start and exclude end point.)

<Operations on list>

t=[42, 1024, 23]

print(1024 in t)               True

print(1024 not in t)          False

print(len(t))                      3           (number of the items.)

print(min(t))                    23

t2=[1, 2, 3]

t3=t+t2

t4=t*2

print(t3)                        [42, 1024, 23, 1, 2, 3]

print(t4)                        [42, 1024, 23, 42, 1024, 23]