什么是“AttributeError：’_ it.TextIOWrapper’对象在python中没有属性’replace’”？

What is a “ AttributeError: '_io.TextIOWrapper' object has no attribute 'replace' ” in python?

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print (
""" Welcome to the code breaker game!
In this game you will have to change symbols into letters in order to decipher secret words.
0 - instructions
1 - start
2 - clues
3 - check your answers
4 - quit
""")

choice = input(" choice :")

if choice == ("0"):
text_file = open ("instructions.txt","r")
print (text_file.read())
text_file.close()

elif choice =="1":
text_file = open ("words.txt","r")
contents = text_file
print (text_file.read())
text_file.close()
a = input("Please enter a symbol")
b = input("Please enter a letter")

newcontents = contents.replace(a,b)
contents = newcontents
print(contents,"
")
text_file.close

elif choice =="2":
text_file = open ("clues.txt","r")
print (text_file.read())
text_file.close()

elif choice =="3":
text_file = open ("solved.txt","r")
print (text_file.read())
text_file.close()

elif choice =="4":
quit

所以基本上我正在做一个计算机科学项目，我的任务是通过将符号替换成字母来制作解码游戏，但是当我尝试将符号的一部分实际上改为字母时，我得到了这个错误。

也有任何方法可以进行此循环(不使用while循环，因为它们非常复杂)？我基本上希望代码在我运行程序时向我显示A和B，并在选择任何选项后为我选择以便能够选择其他选项。 (例如，我按0表示指示，然后可以选择其他选项，例如开始游戏)。