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Print one word from a list in a dictionary (python)

I want my program to print only one random word from a list in my dictionary, but I cannot get the correct syntax for this. I tried using popitem () to get a random value from a list, but it does not seem to work. Here is my code:

import random

thesaurus = {
              "happy":["glad",  "blissful", "ecstatic", "at ease"],
              "sad"  :["bleak", "blue", "depressed"]
            }

# input
phrase = input("Enter a phrase: ")

# turn input into list
part1 = phrase.split()
part2 = list(part1)

newlist = [] 
for x in part2:
    s = thesaurus.get(x, x)
    newlist.append(s)

print (newlist)

For example, if the input

i am happy

The expected result will be

i am glad

or any random word from a list in a dictionary.

But now my conclusion is as follows:

['i', 'am', ['glad', 'blissful', 'ecstatic', 'at ease']]

I know that a different thread is associated with this, but it does not seem to affect this specific problem.

Any help would be appreciated!

edit:

If I extended this formula to work with an imported file with a long list of words, how do I change the code?

newDict = {}
with open('thesaurus.txt', 'r') as f:
    for line in f:
        splitLine = line.split()
        newDict[(splitLine[0])] = ",".join(splitLine[1:])

print ("Total words in thesaurus: ", len(newDict))

# input
phrase = input("Enter a phrase: ")

# turn input into list
part1 = phrase.split()
part2 = list(part1)

# testing input
newlist = []
for x in part2:
    s = newDict[x].pop() if x in newDict else x
    s = random.choice(newDict[x]).upper() if x in newDict else x
    newlist.append(s)


newphrase = ' '.join(newlist)
print (newphrase)

Sample line text in the thesaurus file:

abash,humility,fear
+4
4

, random:

:

import random
>>> l = list(range(10))
>>> random.choice(l)
5
>>> random.choice(l)
9

:

print (" ".join(random.choice(thesaurus[x]) if x in thesaurus else x for x in part2))

:

>>> import random
>>> phrase = "I am feeling sad that he left, but that okay because I'm happy he will be back soon"
>>>
>>> thesaurus = { "happy":["glad",  "blissful", "ecstatic", "at ease"],
...               "sad"  :["bleak", "blue", "depressed"]
...             }
>>> print (" ".join(random.choice(thesaurus[x]) if x in thesaurus else x for x in phrase.split()))
I am feeling bleak that he left, but that okay because I'm blissful he will be back soon
+1
 thesaurus.get(x,x)

thesaurus[x] if x in thesaurus else x

thesaurus["happy"] - ,

,

for x in part2:
   s = thesaurus[x].pop() if x in thesaurus else x # returns first word (and removes from list)
   s = thesaurus[x][0] if x in thesaurus else x # returns first word without removing it
   s = random.choice(thesaurus[x])if x in thesaurus else x # returns random word
   newlist.append(s)
+2

map . , .

newList= list(map(lambda x:  random.choice(x) if type(x) == list else x, newList))

print(" ".join(newList))
+1

for x in part2:
    s = random.choice(thesaurus.get(x, [x]))
    newlist.append(s)

, . random.choice .

0

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