x_list = ['a', 'b', 'c', 'd', 'e']
t_list = ['z', 'y', 'u']
I want replace elements of t_list with elements of x_list, "randomly". I researched and I tried something but replace() didn't work for lists. For example; x_new0 = ['a', 'z', 'c', 'y', 'u], x_new1 = ['z', 'y', 'c', 'd','u']. How can I do this?
You can use the random module and use the random.randint() method to generate a random number between 1 and 100 as a heads and tails coin toss to decide whether to replace the value or not and then use the random.choice() method on the 2nd list to return a random element of the list
import random
first = ['a', 'b', 'c', 'd', 'e']
second = ['z', 'y', 'u']
print(first)
for index, x in enumerate(first):
if random.randint(0, 1):
first[index] = random.choice(second)
print(first)
First run stdout:
>> ['a', 'b', 'c', 'd', 'e']
>> ['y', 'z', 'u', 'y', 'y']
Second run stdout:
>> ['a', 'b', 'c', 'd', 'e']
>> ['a', 'u', 'c', 'u', 'y']
You could use numpy.random.choice to randomly select elements where you want the replacements to occur in the original list. Then zip those indexes against the values you want to use for the substitution and apply the replacements.
from numpy.random import choice
def swap_elements(x, t):
new_x = x[:]
for idx, value in zip(choice(range(len(x)), size=len(t), replace=False), t_list):
new_x[idx] = value
return new_x
Example usage
>>> x_list = ['a', 'b', 'c', 'd', 'e']
>>> t_list = ['z', 'y', 'u']
>>> swap_elements(x_list, t_list)
['y', 'u', 'z', 'd', 'e']
>>> swap_elements(x_list, t_list)
['y', 'b', 'z', 'u', 'e']
>>> swap_elements(x_list, t_list)
['y', 'b', 'z', 'u', 'e']
>>> swap_elements(x_list, t_list)
['a', 'u', 'z', 'y', 'e']
You can choose a random index of one list, and a random index of the other list and take the value at the index of one and place it at the index of the other. For example:
from random import randint
a = [1 ,2, 3, 4]
b = [5, 6, 7, 8]
RandomIndexA = randint(0, len(a) - 1)
RandomIndexB = randint(0, len(b) - 1)
a[RandomIndexA] = b[RandomIndexB]
Alternatively, you could only calculate one random index and then randomly choose an element from the other list using random.choice(b) for example:
from random import randint, choice
a = [1 ,2, 3, 4]
b = [5, 6, 7, 8]
RandomIndex = randint(0, len(a) - 1)
a[RandomIndex] = choice(b)
x_list[2] = t_list[0]t_listare included in the new list, and b) That those elements are in order?ainx_listand it got replaced withz- do all values get replaced byz? If the length of the two lists are the same - is a straight replacement a correct answer. What if there's less elements inxthant... Do the elements ofthave to appear in order inx... etc...?