How do I convert an input string into a variable name?

I'm trying to convert an input string to a variable name. Instead of reading the variable which passes the input string as a string - I'd like it to read it as the variable name.

Example:

Input is "r_all"

subreddit = r_all

# Get subreddit
subreddit = input('Which subreddit would you like to see?: ')


# For each post in "hot" python subreddit - print the title/url
for post in subreddit.json()['data']['children']:
    print(post['data']['title'], ':', post['data']['url'])

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