range parameters python

1# range(start, stop, step)
2  # start = index to begin at (INCLUSIVE)
3  # stop = generate numbers up to, but not including this number (EXCLUSIVE)
4  # step = (can be omitted) difference between each number in the sequence
5
6arr = [19,5,3,22,13]
7
8# range(stop)
9for i in range(len(arr)):
10    print(arr[i]) # prints: 19, 5, 3, 22, 13
11
12# range(start, stop)
13for i in range(2, len(arr)):
14    print(arr[i]) # prints: 3, 22, 13
15    
16# range(start, stop, step)
17for i in range(0, len(arr), 2):
18    print(arr[i]) # prints: 19, 3, 13
19    
20# reverse:
21for i in range(len(arr)-1, -1, -1):
22    print(arr[i])
23

1range(4)        # [0, 1, 2, 3] 0 through 4, excluding 4
2range(1, 4)     # [1, 2, 3] 1 through 4, excluding 4
3range(1, 10, 2) # [1, 3, 5, 7, 9] 1 through 10, counting by 2s
4

1# range(start, stop, step)
2  # start = (can be ommitted) index to begin at (INCLUSIVE)
3  # stop = generate numbers up to, but not including this number (EXCLUSIVE)
4  # step = (can be omitted) difference between each number in the sequence
5
6# idx:  0	1	2	3 	4
7# arr:  19	5	3	22	13
8  
9arr = [19,5,3,22,13]
10
11# range(stop)
12for i in range(len(arr)):
13    print(arr[i]) # prints: 19, 5, 3, 22, 13
14
15# range(start, stop)
16for i in range(2, len(arr)):
17    print(arr[i]) # prints: 3, 22, 13
18    
19# range(start, stop, step)
20for i in range(0, len(arr), 2):
21    print(arr[i]) # prints: 19, 3, 13
22    
23# reverse:
24for i in range(len(arr)-1, -1, -1):
25    print(arr[i])

1#range(start,stop,step)
2for x in range(0,20,2):
3  print(x)

1arr_data=[1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20] 
2user = int(input("Enter the product of numbers: ")) 
3for i in range(0,20,1): 
4    a = arr_data[i] 
5    for t in range(0,20,1): 
6        b = arr_data[t] 
7        if (a*b) == user: 
8            print(a,"x",b,"=",user) 
9        else: 
10            pass 
11

1for i in range (start, step, stop):
2  dosomething()