打印出列表中每个项目的第一个字母

Question

I am trying to create a program that asks for a word input until '' is entered. Then the program will print out all of the words joined in a sentence. Then take the first letter of each word to make an acrostic. I am using python. Example shown below. Thank you in advance. This is due really soon. :)

• What I have coded:

sentence = []

acrostic = []

word = -1

while word:

     sentence.append(word)

      acrostic.append(sentence[0].upper())
print(sentence)
print("-- {}".format(acrostic))

• What I want the code to do:

Word: A

Word: cross

Word: tick

Word: is

Word: very

Word: evil

Word: 

A cross tick is very evil

-- ACTIVE

Answer 1

For input:

• in a loop, ask the user a word, if it nothing just stop
• if it's a word, save it in sentence and it's first letter in acrostic ( word[0] not sentence[0] )

For output:

• for the sentence join the words with a space : " ".join(sentence)
• for the acrostic, join the letters with nothing : "".join(acrostic)

sentence = []
acrostic = []
while True:
    word = input('Please enter a word, or enter to stop : ')
    if not word:
        break
    sentence.append(word)
    acrostic.append(word[0].upper())

print(" ".join(sentence))
print("-- {}".format("".join(acrostic)))

Gives

Please enter a word, or " to stop : A
Please enter a word, or " to stop : cross
Please enter a word, or " to stop : tick
Please enter a word, or " to stop : is
Please enter a word, or " to stop : very
Please enter a word, or " to stop : evil
Please enter a word, or " to stop : 
A cross tick is very evil
-- ACTIVE

Answer 2

python 3.8 or later

sentence = []
acrostic = []
while user_input := input('word: '):
    sentence.append(user_input)
    acrostic.append(user_input[0].upper())

print(' '.join(sentence))
print(f"-- {''.join(acrostic)}")

output:

word: A
word: cross
word: tick
word: is
word: very
word: evil
word: 
A cross tick is very evil
-- ACTIVE

python 3.6 and 3.7

sentence = []
acrostic = []
while True:
    user_input = input('word: ')
    if not user_input:
        break
    sentence.append(user_input)
    acrostic.append(user_input[0].upper())

print(' '.join(sentence))
print(f"-- {''.join(acrostic)}")

python 3.5 or earlier

sentence = []
acrostic = []
while True:
    user_input = input('word: ')
    if not user_input:
        break
    sentence.append(user_input)
    acrostic.append(user_input[0].upper())

print(' '.join(sentence))
print('-- {}'.format(''.join(acrostic)))

Answer 3

Maybe you're looking for something like this:

sentence = []
acrostic = []
word = -1

while word != "":
    word = input("Word: ")

    if word:
        sentence.append(word)
        acrostic.append(word[0].upper())

print(" ".join(sentence))
print("-- {}".format("".join(acrostic)))

Answer 4

Goal: To extract first letter of each word untill '' is entered.

acrostic = ""
sentence = ""
while(True):
    word = input("enter a word= ")
    if(word!=''):
        acrostic+=word[0].upper()
        sentence+=word+" " 
    else:
        break
print(sentence)
print(acrostic)

With your sample input;

enter a word= A
enter a word= cross
enter a word= tick
enter a word= is
enter a word= very
enter a word= evil
enter a word= 

output

A cross tick is very evil
ACTIVE

Answer 5

While everybody has you covered for basic loops, this is a nice example to use the iter(callable, sentinel) pattern:

def initial():
    return input('Word: ')[:1]

print('-- ' + ''.join(iter(initial, '')))

Will produce:

Word: A
Word: cross
Word: tick
Word: is
Word: very
Word: evil
Word: 
-- Active