How to concatenate strings from random character with list?

Question

I have this script that picks up random words from an URL and it concatenates with other special characters stored in a list:

import requests
import random
from random import randint
import string

url = 'https://svnweb.freebsd.org/csrg/share/dict/words?view=co&content-type=text/plain'
r = requests.get(url)

text = r.text
words = text.split()
random_num = randint(0, len(words))
random_num2 = [randint(0,10)]

special_list = ['#','!','@','-', '@']
union = "".join(str(x) for x in special_list)
special_char = random.choices(union, k=2)
special_char2 = random.choices(union)

final_string = (str(special_char).strip('[]') + words[random_num] + '__' + 
                str(random_num2).strip('[]') + str(special_char2).strip('[]'))

The output is something like that: '-', '@'auxiliary__2'-'.

The problem is even if I use .join I cannot get rid of '' and concatenate everything together.

I also tried with:

   random_char = ''.join(string.punctuation for i in range(0,1))

instead using a special character list, but also this didn't work.

Ranges are exclusive so range(0,1) == [0]

3vts
– 3vts

2020-08-21 15:42:48 +00:00
Commented Aug 21, 2020 at 15:42 — 3vts
– 3vts, Commented Aug 21, 2020 at 15:42
Also, what is your expected output?

3vts
– 3vts

2020-08-21 15:49:01 +00:00
Commented Aug 21, 2020 at 15:49 — 3vts
– 3vts, Commented Aug 21, 2020 at 15:49

GAEfan · Accepted Answer · 2020-08-21 16:07:45Z

1

Not sure exactly what you want the final output to be, but try:

random_num2 = [randint(0,10)][0]

then:

final_string = f"{''.join(map(str, special_char))}{words[random_num]}__{random_num2}{''.join(map(str, special_char2))}"

or you can get special characters by index:

final_string = f"{''.join(map(str, special_char))}{words[random_num]}__{random_num2}{special_char2[0]}"

answered Aug 21, 2020 at 16:07

GAEfan

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2 Comments

Steven Over a year ago

thanks, this works as well! is f{} a dictionary? If so I don't understand why it is used for this purpose.

GAEfan Over a year ago

No, it is an f-string. A string format shortcut in Python 3. It allows you to directly inject variables, etc. into the string. realpython.com/python-f-strings

pho · Accepted Answer · 2020-08-21 15:54:24Z

0

random.choices gives you a list. You can access things in the list like so: special_char[0] instead of converting the list to a string and messing about with the string. That way, you won't get the apostrophes that you get in the string representation of a list. str(special_char) ==> ['-', '@'] (for example). If you do ", ".join(special_char), you just get -, @. If you don't want the comma in between, just "".join(special_char) gives -@.

Also, random_num2 = [randint(0,10)] creates a list with just one number. If you want to access just the number in the list, you need random_num2[0]. Or you can convert them all to strings and use ",".join() just like we did for special_char

random_num2_str = [str(num) for num in random_num2]
special_char = random.choices(union, k=2) 
special_char2 = random.choices(union)

final_string = ", ".join(special_char) + words[random_num] + '__' + ", ".join(random_num2_str) + special_char2[0]

Unless you really need random_num2 as a list, you should do random_num2 = randint(0,10). Then, you could do

final_string = ", ".join(special_char) + words[random_num] + '__' + str(random_num2) + special_char2[0]

answered Aug 21, 2020 at 15:54

pho

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4 Comments

Steven Over a year ago

thanks, it seems working. The reason behind random_num2 = [randint(0,10)] was that I just wanted one number. What is the difference between random_num2[0] ? It should return one number as well.

pho Over a year ago

randint(0,10) returns one random integer between 0 and 10. You were putting it in a list before assigning the list to random_num2. To access the xth element of the list, you need to do random_num2[x], or random_num2[0] because it only has the one element that you want to access.

Steven Over a year ago

alright, thanks, I understand now. By the way, I don't know why your answer was downvoted, I selected it as useful.

pho Over a year ago

@Steven, you're welcome. You should upvote answers that you find helpful. Somebody has been downvoting all my answers today. No worries though, all the illegitimate downvotes will be removed at 3AM UTC today.

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