How do i choose to pick random choice from the list given below.
colours = ['red', 'blue', 'green', 'yellow', 'black', 'purple', 'Brown', 'Orange', 'violet', 'gray'] pick 2 items from remaining 9 items.
finally pick 3 items from remaining 7 items.
Brown
green and violet
red black and gray
A simple way would just be to delete the chosen values from the list. It is slightly simpler if you use sets:
In []: colours = {'red', 'blue', 'green', 'yellow', 'black', 'purple', 'Brown', 'Orange', 'violet', 'gray'} for n in [1, 2, 3]: cs = random.sample(colours, k=n) colours -= set(cs) print(cs) Out[]: ['Brown'] ['Orange', 'red'] ['purple', 'gray', 'blue'] 
colors = ['red', 'blue', 'green', 'yellow', 'black', 'purple','Brown', 'Orange', 'violet', 'gray'] for n in range(1,4): select=np.random.choice(colors,n) print(select) colors=list(set(colors).difference(set(select))) output:-['Brown'] ['red' 'violet'] ['yellow' 'Orange' 'black'] 
The method I use consist in shuffling your input vector take the selected number of elements you need.
import random colours = ['red', 'blue', 'green', 'yellow', 'black', 'purple', 'Brown', 'Orange', 'violet', 'gray'] random.shuffle(colours) for i in range(1, 4): n, colours = colours[0:i], colours[i:] print(n) 
