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Given the following text description, write Python code to implement the functionality described below step by step
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Description:
 Random Sample
Consider comments made since min_timestamp. Take n random comments from non-bot users.
Params
Step2:  Query
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Python Code:
n = 50000
min_timestamp = '2000-01-01T00:00:00Z' # start of time
Explanation: Random Sample
Consider comments made since min_timestamp. Take n random comments from non-bot users.
Params
End of explanation
t1 = time.time()
query = 
SELECT 
    *
FROM
    enwiki.article_talk_diff_no_bot_sample
WHERE
    rev_timestamp > '%(min_timestamp)s'
    AND ns = 'article'
LIMIT %(n)d
params = {
    'n': int(n * 1.7),
    'min_timestamp': min_timestamp
    }
df = query_hive_ssh(query % params, '../../data/raw_random_sample.tsv', priority = True, quoting=3, delete = True)
df.columns = [c.split('.')[1] for c in df.columns]
t2 = time.time()
print('Query and Download Time:', (t2-t1) / 60.0)
dfc = clean(df[300:500])
show_comments(dfc, 100)
Explanation: Query
End of explanation
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