for

#1. for & range

for x in range(5): #0~4
    print('hello', x, sep='')


====Result====
hello0
hello1
hello2
hello3
hello4

 

#2. for & reversed

print('Example1')
for x in range(3, 6): #3,4,5
    print(x, end='/')

print('\nreversed')
for x in reversed(range(3, 6)): #5,4,3
    print(x, end='/')

print('\n\nExample2')
for x in range(0,7,2): #0,2,4,6
    print(x, end='/')

print('\nreversed')
for x in reversed(range(0,7,2)): #6,4,2,0
    print(x, end='/')

print('\n\nExample3')
for x in range(8,1,-2): #8,6,4,2
    print(x, end='/')

print('\nreversed')
for x in reversed(range(8,1,-2)): #2,4,6,8
    print(x, end='/')

====Result====
Example1
3/4/5/
reversed
5/4/3/

Example2
0/2/4/6/
reversed
6/4/2/0/

Example3
8/6/4/2/
reversed
2/4/6/8/

 

#3. for & sequence types

print('[list]')
a = [10, 20, 30, 40, 50]
for i in a:
    print(i, end='/')

print('\nreversed')
for i in reversed(a):
    print(i, end='/')

print('\n\n[tuple]')
b = (1, 2, 3, 4)
for i in b:
    print(i, end='/')

print('\nreversed')
for i in reversed(b):
    print(i, end='/')

print('\n\n[string]')
for letter in 'Hello':
    print(letter, end='/')

print('\nreversed')
for letter in reversed('Hello'):
    print(letter, end='/')
    
=====Result====
[list]
10/20/30/40/50/
reversed
50/40/30/20/10/

[tuple]
1/2/3/4/
reversed
4/3/2/1/

[string]
H/e/l/l/o/
reversed
o/l/l/e/H/

for i in range(1,6):
    for j in range(i):
        print('*', end='')
    print()
    
====Result====
*
**
***
****
*****