Question

所以我有一个问题需要这个功能：颜色，大小，肉和类用空格分隔。编写一个Python程序，询问用户输入文件的名称（在本例中为animals.txt）和输出文件（任何名称）。程序读入输入文件的行，忽略注释行（以＃开头的行）和空行并计算并打印以下问题的答案：动物总数？危险动物总数？安全的大型动物数量？棕色和危险的动物数量？红色或硬肉的安全动物数量？

所以我完成了程序，一切似乎都在工作，但到目前为止，当我输入代码并启动程序时，一切正常，没有错误，只有没有输出文件生成。我不知道到底出了什么问题，但如果有人能指出我正确的方向，我将非常感激。

import os.path
endofprogram = False

try:
    filename1 = input("Enter the name of input file: ")
    filename2 = input("Enter the name of output file: ")
    while os.path.isfile(filename2):
        filename2 = input("File Exists! Enter new name for output file: ")
        infile = open(filename1, 'r')
        ofile = open(filename2, "w")
except IOError:
        print("Error reading file! Program ends here")
        endofprogram = True
        if (endofprogram == False):
            alist = []
            blist = []
            clist = []
            largesafe = 0
            dangerous = 0 
            browndangerous = 0
            redhard = 0        
            for line in infile:
                line = line.strip("\n")
                if (line != " ") and (line[0] != "#"):
                    colour, size, flesh, clas = line.split('\t')
                    alist = alist.append(colour)
                    animals = alist.count()

                while clas == "dangerous":
                    dangerous = dangerous + 1

                while size == "large" and clas == "safe":
                    largesafe = largesafe + 1

                while colour == "brown" and clas == "dangerous":
                    browndangerous = browndangerous + 1

                while colour == "red" and flesh == "hard":
                    redhard = redhard + 1

                ofile.write(print("Animals = \n", animals))
                ofile.write(print("Dangerous = \n", dangerous))
                ofile.write(print("Brown and dangerous = \n", browndangerous)) 
                ofile.write(print("Large and safe = \n", largesafe))
                ofile.write(print("Safe and red color or hard flesh= \n", redhard))


            infile.close()
            ofile.close()

Answer 1

也许您可以删除print

中的ofile.write

ofile.write(print("Animals = \n", animals))

到

ofile.write("Animals = \n" + str(animals))

Answer 2

你的缩进完全搞砸了程序。最大的罪犯是这一部分：

except IOError:
    print("Error reading file! Program ends here")
    endofprogram = True
    if (endofprogram == False):

if行只会在endofprogram = True行之后立即执行，此时endofprogram == False将为false，因此if块中没有任何内容 - 包含程序的其余部分 - 将被执行。你需要将if以后的所有内容都放在一个层面上。

python的输入和输出程序

2 个答案: