python - 属性错误: 'str' object has no attribute 'readline' While Reading from File

Question

我运行这段代码:

file=open(filename, 'r')

line=filename.readline()
totallines=0
total=0
while line != "":
    amount=float(line)
    print(format(amount, '.2f'))
    line=filename.readline()
    totallines+=1
    total+=amount
avg=total/totallines
print("The average of the numbers is", format(avg, '.2f'))

它给了我这个错误AttributeError: 'str' object has no attribute 'read'

我不明白我做错了什么？

Answer 1

您正在调用文件名，它是一个字符串，而不是这里的文件

file=open(filename, 'r')
line=filename.readline()

应该是line=file.readline()

为了改进代码，我建议您使用with和as，它们的执行速度更快，而且更多可读性::

with open(filename, 'r') as file
line=file.readline()