如何将str类型转为对象？趣味数据库搜索函数遇AttributeError报错

Hey there! Let's break down your problem and fix that frustrating error step by step.

The error 'str' object has no attribute 'print_info' happens because when you run person = input("Who are you searching for? "), the person variable stores a plain string (like "Alice" or "Bob"), not an instance of your custom person class. Strings don't have a print_info() method—that's a method you’ve defined on your object, right? So when you try to call person.print_info() later in your code, Python throws an error because it can’t find that method on a basic string.

The solution is to map the input string (the person’s name) to the actual object in your database. Here’s how to do it:

1. Store Your Objects in a Dictionary First #

First, organize all your person objects in a dictionary where the keys are name strings (matching what users will input) and the values are the actual objects. For example:

# Assuming this is your custom Person class
class Person:
    def __init__(self, name, job, age):
        self.name = name
        self.job = job
        self.age = age
    
    def print_info(self, info_type):
        # Your logic to print specific details
        if info_type == "Job":
            print(f"{self.name}'s job is {self.job}")
        elif info_type == "Age":
            print(f"{self.name} is {self.age} years old")
        # Add other info types as needed

# Create a dictionary to map names to Person objects
people_database = {
    "Alice": Person("Alice", "Software Engineer", 32),
    "Bob": Person("Bob", "Graphic Designer", 27),
    "Charlie": Person("Charlie", "Data Analyst", 29)
}

2. Adjust Your Search Code to Use the Dictionary #

Now modify your existing code to pull the object from the dictionary using the input string:

if password == "xxxx":
    search_name = input("Who are you searching for? ")
    if search_name == "Everyone":
        print("Searching for everyone...")
        info = input("What do you want to know about everyone? ")
        # Loop through all Person objects in the dictionary
        for person in people_database.values():
            person.print_info(info)
    else:
        # Check if the name exists in our database
        if search_name in people_database:
            target_person = people_database[search_name]
            info = input("What do you want to know about them? ")
            target_person.print_info(info)
        else:
            print(f"Oops, {search_name} isn't in the database yet!")

By using the dictionary, you’re essentially translating the user’s input string into the actual object you created. Now when you call target_person.print_info(), you’re calling the method on a real Person object—not a string—so Python won’t throw that AttributeError anymore.

内容的提问来源于stack exchange，提问作者SnitchingAuggie