请求协助完善Python收集姓名与年龄的字典函数

Let's walk through the issues in your code and fix them step by step to get a working solution:

Key Problems in Your Original Code #

• Incorrect Input Handling: input('Enter a name' and "Enter age for") doesn’t work as intended—and here only returns the second string, and you can’t capture two separate values with one input() call. You need distinct prompts for name and age.
• Broken Loop & Dictionary Logic: Your while loop references a name variable initialized outside the function, and the loop body has unrelated math code that doesn’t modify the dictionary. Also, dictionaries don’t use + to add entries—you assign values with dict[key] = value.
• Scope Issue: The empty dictionary is defined outside the function, so it would retain data between function calls. It should be created inside the function to start fresh each time.
• Missing Age Handling: You commented out the age input, but we need to capture this value (and convert it to an integer since age is numeric).

Corrected Working Code #

Here’s a version that meets your requirements, plus the average age summary you mentioned in your print statement:

def collect_names_ages():
    people = {}  # Empty dictionary initialized inside the function for clean scope
    while True:
        name = input("Enter a name (type 'END' to stop): ")
        if name == 'END':
            break  # Exit the loop when user signals they're done
        
        # Handle invalid age inputs to avoid crashes
        try:
            age = int(input(f"Enter age for {name}: "))
        except ValueError:
            print("Oops, please enter a valid number for age.")
            continue  # Skip to next iteration if age is not a number
        
        people[name] = age  # Add the name-age pair to the dictionary
    
    return people

# Run the function and store the result
person_dict = collect_names_ages()

# Calculate and display the summary
num_people = len(person_dict)
if num_people > 0:
    average_age = sum(person_dict.values()) / num_people
    print(f"You have entered {num_people} names of people, whose average age is {average_age:.2f}.")
else:
    print("No names were entered.")

Explanation of Changes #

• Clean Function Scope: The empty dictionary people lives inside the function, so it’s reset every time you call collect_names_ages().
• Intuitive Loop Control: while True creates an infinite loop that breaks when the user types 'END'—this is simpler than checking a variable initialized outside the loop.
• Input Validation: The try-except block catches cases where the user enters non-numeric ages, preventing the program from crashing and prompting them to try again.
• Proper Dictionary Updates: We add entries using people[name] = age, the standard way to assign key-value pairs in Python dictionaries.
• Summary Calculation: After collecting the data, we calculate the number of people (using the dictionary’s length) and average age (sum of values divided by count), then print a formatted summary.

内容的提问来源于stack exchange，提问作者JBreal1