Initialize multiple variables with different parameters

Question

I have the following code in python 3:

x = [(''.join(random.choices(string.ascii_lowercase, k=7))) for _ in range(5)]

Is there a better way to initialize multiple (5+) lists with different K values and in range()?

ex:

y = [(''.join(random.choices(string.ascii_lowercase, k=3))) for _ in range(5)]
z = [(''.join(random.choices(string.ascii_lowercase, k=7))) for _ in range(2)]
a = [(''.join(random.choices(string.ascii_lowercase, k=4))) for _ in range(3)]
b = [(''.join(random.choices(string.ascii_lowercase, k=3))) for _ in range(5)]
c = [(''.join(random.choices(string.ascii_lowercase, k=1))) for _ in range(3)]

generate the lists in a loop and append to another list which is declared before the loop — PYA
– PYA, Commented Jul 7, 2017 at 19:09

Moses Koledoye · Accepted Answer · 2017-07-07 19:10:24Z

5

Put the list comprehension in a function and use that repeatedly:

def func(k, r):
   return [(''.join(random.choices(string.ascii_lowercase, k=k))) for _ in range(r)]

y = func(3, 5)
...
c = func(1, 3)

If you have the values of k and r in two lists, you can do:

y,..., c =  (func(*t) for t in zip(lst_k, lst_r))

Or better still keep the data structure as a list of lists to not worry about the number of targets on the LHS:

super_list = [func(*t) for t in zip(lst_k, lst_r)]

answered Jul 7, 2017 at 19:10

Moses Koledoye

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Comments

Prune · Accepted Answer · 2017-07-07 19:12:39Z

4

Sure: parameterise the arguments:

import random
import string

k_val = [3, 7, 4, 3, 1]
r_val = [5, 2, 3, 5, 3]

x = [[(''.join(random.choice(string.ascii_lowercase, k=k_val[i])))
           for _ in range(r_val[i])] for i in range (len(r_val)) ]

answered Jul 7, 2017 at 19:12

Prune

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