python - 编写一个程序计算文件中存储的所有数字的平均值

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'''
Average Number 
'''

def main ():
    import sys
    try:
        NumberTxt = open("numbers.txt", "r")
    except IOError as e:
        print ("Non-numeric data found in the file   /n press enter" )
    except (ValueError):
        print( "Non-numberic data found in the file /n press enter")
    else:
        TotalNumber = 0
        NumbersOfLines = 0
        line = NumberTxt.readline()

        while line !="":
            NumbersOfLines += 1
            TotalNumber += int( line )
            line = NumberTxt.readline()
        averageNumbers = TotalNumber / NumbersOfLines

        print ( "The average is:", averageNumbers)
        print ( "press enter" )

main()

Answer 1

如果信息不完整，最有可能的原因是因为你从文件中读取的行末尾仍然有换行符，所以最后一行只是换行符\n，所以while 仍然为 true，但是 int("\n") 失败。因此，要修复更改这两行:

line = NumberTxt.readline().strip() # Strip leading and trailing spaces and newlines

while line: # Not strictly necessary, but more Pythonic to test this way