Python error: NameError: name 'xxx' is not defined, how to solve it?

Python error: NameError: name 'xxx' is not defined, how to solve it?

When programming in Python, we sometimes encounter the error "NameError: name 'xxx' is not defined". This error is usually caused by using an undefined variable or function. The key to solving this error is to find out the cause of the problem and take appropriate solutions. This article will illustrate how to solve this problem through a specific code example.

Suppose we have the following Python code:

def calculate_average(numbers):
    total = sum(numbers)
    average = total / len(numbers)
    return average

scores = [85, 90, 92, 88]
average_score = calculate_average(scores)
print("The average score is:", average_score)
print("The minimum score is:", min_score)

In this code, we define a function called calculate_average, which accepts a list of numbers as a parameter, Calculate the average and return it. We then define a list called scores and pass it as a parameter to the calculate_average function, assigning the returned average to the variable average_score. Finally, we print out the average score and the lowest score.

However, when we run this code, the following error message will appear:

NameError: name 'min_score' is not defined

This error occurs in the print statement on the last line. The reason for the error is that the variable min_score is not defined in the code. To resolve this error, we need to ensure that the variable min_score is correctly defined before using it.

One workaround is to add a line to the code that defines the variable min_score and initializes it to the lowest score in the list scores. The modified code looks like this:

def calculate_average(numbers):
    total = sum(numbers)
    average = total / len(numbers)
    return average

scores = [85, 90, 92, 88]
average_score = calculate_average(scores)
min_score = min(scores)  # 添加了这行代码
print("The average score is:", average_score)
print("The minimum score is:", min_score)

By adding the line min_score = min(scores) we define the variable min_score and initialize it to scoresThe lowest score in the list. Now, when we run the code again, we will not encounter the "NameError: name 'min_score' is not defined" error.

To summarize, when encountering the error "NameError: name 'xxx' is not defined", we need to check whether the variables or functions in the code are correctly defined. If it is not defined, we need to define it before using it and make sure the spelling and case of the variable or function name are correct. Only in this way can we successfully solve this error and let our code run normally.

I hope that through this example, you will have a deeper understanding of solving the "NameError: name 'xxx' is not defined" error. In the programming process, mistakes are common. Don't be discouraged when you encounter errors. Be patient to find problems and continuously improve your skills through learning. Let’s work hard together on the road to programming!

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