Python 3.x 通过搜索关键字修改/删除文本文件字典中的值

我有一个使用itertools转换成字典的文本文件

import itertools

plantfile = 'myplants.txt' #file path
plant = {} #create an empty dictionary
with open(plantfile, 'r') as f:
    for empty_line, group in itertools.groupby(f, lambda x: x == '\n'): 
        if empty_line:
            continue
        fruit, *desc = map(str.strip, group)
        plant[fruit] = desc

结果是：

{'BANANA' : ['delicious', 'yellow'],

'WATERMELON' : ['big', 'red'],

'ORANGE' : ['juicy', 'vitamin c']} 

我想提示用户水果的名称（键）以修改键和描述（值）或删除整个记录。如果我能使用def（）函数就最好了

以下是我目前的代码。它们不会返回任何错误消息，但是，它们也不会反映在字典文件中

    print("What do you want to do with this database?
    1. Modify fruit information
    2. Delete fruit record")
    
    choice == input("Please enter your choice in number: ")
    
    while True:
        try:
            if choice == '1':
               original_name = input("What is the fruit name you would like to modify?").upper()
               new_name = input("What is the new fruit name?")
            
               with open(file, 'r+') as f: 
               string = f.read() 
               string = string.replace(original_name, new_name) 
               f.truncate(0) 
               f.seek(0) 
               f.write(string) #writeback to file
               print(f"You have modified {original_name} to {new_name}.")
               break
            else:
               delname = input("Please enter the name of the fruit: \n").upper() 
               delname = dict(filter(lambda item: delname in item[0], plant.items())) 
               break
    except ValueError:
        print("Invalid input. Please try again.")

我不知道如何修改这些值，而且上面修改键名的代码似乎也不起作用

上面删除整个记录的代码也没有反映在原始文件中

例如，我想将西瓜的价值从“大”改为“硬”，并希望删除香蕉的整个记录

{'watermelon' : ['hard', 'red'],
    
    'orange' : ['juicy', 'vitamin c']} 

---

请帮帮我。感谢您更新本节以反映以下内容：

while True:
        try:
            if choice == '1':
               original_name = input("What is the fruit name you would like to modify?").upper()
               new_name = input("What is the new fruit name?").upper() #convert this to uppercase also
            
               with open(file, 'r+') as f: 
               string = f.read() 
               string = string.replace(original_name, new_name) 
               f.truncate(0) 
               f.seek(0) 
               f.write(string) #writeback to file
               f.close() # TODO: You have not been saving the file record. Implement this.
               print(f"You have modified {original_name} to {new_name}.")
               break
            else:
               delname = input("Please enter the name of the fruit: \n").upper() 
               with open(file, 'r+') as f: 
               f.read()
               f.pop(delname, None) #This deletes or lets you go ahead if it doesnt exist 
               f.close()
               print(f"You have deleted {delname}.")
               break
except ValueError:
        print("Invalid input. Please try again.")