我的 python 代码需要帮助。我一直在尝试将输入的句子保存到文本文件中，而不重复文件中的单词。我不确定该怎么做。
感谢任何帮助。
这是我的代码:
import sys
#user-friendly, informs the user what do to
answer = input("What is your name?\n")
print("Hello " + answer + " and welcome to this program!\n")
print("This program will ask you for a sentence and print out the positions of the words instead of the actual words. it will then save it in a file with the sentence.\n")
repeat = True
loop = True
true = True
#Allows the user to decide whether or not they want to use the program
while repeat:
answer2 = input("Do you want to do run this program?\n")
#if the answer is 'no' then the program stops
if answer2.lower() == "No" or answer2.lower() == "nah" or answer2.lower() == "no" or answer2.lower() == "n":
print ("Okay then ... Bye.")
sys.exit()
#if the answer is 'yes' then the code continues
elif answer2 == "Yes".lower() or answer2.lower() == "yeah" or answer2.lower() == "yes" or answer2.lower() == "y":
print ("Okay then ... \n")
while true:
if loop == True:
sentence = input("Please enter a sentence:\n").lower()
#converts the sentence into a list
s = sentence.split()
#works out the positions of the words
positions = [s.index(x)+1 for x in s]
print(positions)
#opens a text file
fi = open("CA Task 2.txt", "w")
#Allows you to write over the original content in the file
fi.write(str(s))
#it closes the file once you've finished with it
fi.close()
#opens a text file
fi = open("CA Task 2.txt", "a")
#Allows you to add to the text file instead of writing over it
fi.write("\n")
fi.write(str(positions))
#it closes the file once you've finished with it
fi.close()
sys.exit()
#if the answer is neither 'yes' nor 'no' then the programs jumps to this part and allows the user to try again
else:
print("Please enter a valid answer! Try again!\n")
假设输入的句子是“问的不是你的国家能为你做什么，而是你能为你的国家做什么”。
它应该说: 不要问你的国家能为你做什么，而要问你能为你的国家做什么
[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 3, 9, 6, 7, 8, 4, 5]
这是可行的，然后必须将其保存到文本文件中: ['问', '不', '什么', '你的', '国家', '可以', '做', '为', '你', '但是', '什么', '你', '可以'、'做'、'为'、'你的'、'国家']
[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 3, 9, 6, 7, 8, 4, 5]
这很好，但我希望它做的是，如果该词已在文本文件中被提及一次，则不再重复该词。
请您参考如下方法:
内置函数调用:set https://docs.python.org/3/library/stdtypes.html#set :
import sys
#user-friendly, informs the user what do to
answer = input("What is your name?\n")
print("Hello " + answer + " and welcome to this program!\n")
print("This program will ask you for a sentence and print out the positions of the words instead of the actual words. it will then save it in a file with the sentence.\n")
repeat = True
loop = True
true = True
#Allows the user to decide whether or not they want to use the program
while repeat:
answer2 = input("Do you want to do run this program?\n")
#if the answer is 'no' then the program stops
if answer2.lower() == "No" or answer2.lower() == "nah" or answer2.lower() == "no" or answer2.lower() == "n":
print ("Okay then ... Bye.")
sys.exit()
#if the answer is 'yes' then the code continues
elif answer2 == "Yes".lower() or answer2.lower() == "yeah" or answer2.lower() == "yes" or answer2.lower() == "y":
print ("Okay then ... \n")
while true:
if loop == True:
sentence = input("Please enter a sentence:\n").lower()
# converts the sentence into a list
s = sentence.split()
# for loop makes sure that if the word is in the list then it wont print it out again
for word in s:
if word not in s:
s.append(word)
# works out the positions of the words
positions = [s.index(x) + 1 for x in s]
print(set(positions))
# opens a text file
fi = open("CA Task 2.txt", "w")
# Allows you to write over the original content in the file
fi.write(str(set(s)))
# it closes the file once you've finished with it
fi.close()
# opens a text file
fi = open("CA Task 2.txt", "a")
# Allows you to add to the text file instead of writing over it
fi.write("\n")
fi.write(str(set(positions)))
# it closes the file once you've finished with it
fi.close()
sys.exit()
#if the answer is neither 'yes' nor 'no' then the programs jumps to this part and allows the user to try again
else:
print("Please enter a valid answer! Try again!\n")'
