Question

这是我在Python Run Command中获得的错误代码，我尝试了多种方法来解决这个问题。任何人都可以指出我做错了什么以及如何解决它？

Traceback (most recent call last):
File "J:\Python\SumOfNumbers.py", line 24, in <module>
main ()
File "J:\Python\SumOfNumbers.py", line 15, in main
total += float(num)
NameError: global name 'num' is not defined

def main ():
# Declare varibles
line = ''
total = 0.0
number = 0.0

#Open numbers.txt file and make sure that numbers.txt is in the same
#folder as Python.

infile = open('numbers.txt', 'r')

for line in infile:
    number= float(line)
    total += float(num)

# Close file
infile.close ()

# Display the total of the numbers in the file
print ('Total: ', total)

# Call the main function.
main ()

Answer 1

在你的代码中，你写了

total += float(num)

但是，num不是变量的名称。你应该写的

total += float(number)

Answer 2

你走了。名为num的变量未初始化，在您的程序中它被称为数字。当python使用它们来定义代码块时，请注意缩进。

def main():
    line = ''
    total = 0.0
    number = 0.0

    # Open numbers.txt file and make sure that numbers.txt is in the same
    # folder as Python.
    infile = open('numbers.txt', 'r')

    for line in infile:
        number = float(line)
        total += float(number)

    # Close file
    infile.close()

    # Display the total of the numbers in the file
    print ('Total: ', total)

# Call the main function.
main()

Python代码错误 - 数字之和

2 个答案: