.txt 文件中的密钥生成器

Question

我给你一个例子我点击运行在控制台中写一个数字（多少个键）然后我得到这个随机字母和数字：61PYY-ZEPY1-2H82R-V1JZ1-9VEF7，但我希望它们在我的 demofile2.txt。当我将其粘贴到写入中时：'-'.join(''.join(random.choice(seq) for _ in range(5)) for _ in range(5)) 它说 seq 未定义

这是代码：

import random, sys

class KeyGen():
    def __init__(self):
        global i
        i = int(input("How many serial codes are you looking for? \n"))
        print("")
        self.main(i)

    def main(self, count):
        """ Our main iteration function, using simple
        capital letters, along with the numbers 0-9 """
        seq = "ABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890"

        for i in range(count):
            print('-'.join(''.join(random.choice(seq) for _ in range(5)) for _ in range(5)))

        print("\nCreated {} serial keys.".format(count))

if __name__ == '__main__':
    app = KeyGen()

text_file = open("demofile2.txt.")
text_file.write(THISISWHATISEARCH)
text_file.close()

Answer 1

要写入文件，您只需将字符串传递给file.write()。在您的情况下，您正在打印相同的字符串。

一个区别是print 自动在每个字符串的末尾添加一个新行（因为参数end='\n' 的默认值）。因此，在写入文件时，您可以添加一个结束换行符。或者，您可以使用print 的file 参数来避免任何更改！

现在你只需要在你想写入的地方有可用的文件描述符。这可能取决于其余代码的设计，为简单起见，我将简单地将其移至 main 函数。

还有一点是在读/写文件时，最好使用withcontext manager：

import random, sys

class KeyGen():
    def __init__(self):
        global i
        i = int(input("How many serial codes are you looking for? \n"))
        print("")
        self.main(i)

    def main(self, count):
        """ Our main iteration function, using simple
        capital letters, along with the numbers 0-9 """
        seq = "ABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890"

        with open("demofile2.txt.", 'w') as text_file:
            for i in range(count):
                print('-'.join(''.join(random.choice(seq) for _ in range(5)) for _ in range(5)), file=text_file)
                # text_file.write('-'.join(''.join(random.choice(seq) for _ in range(5)) for _ in range(5)) + '\n')

            print("\nCreated {} serial keys.".format(count), file=text_file)
            # text_file.write("\nCreated {} serial keys.\n".format(count))

if __name__ == '__main__':
    app = KeyGen()

---

我将利用这个机会提供一般提示：

在 Python 中没有必要过度使用类。也许你来自 Java 背景，一切都是类，但在这里你的类只是作为一个函数的网关。所以你的代码可能是：

import random, sys

def main():
    """ 
    Our main iteration function, using simple
    capital letters, along with the numbers 0-9 
    """
    seq = "ABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890"

    count = int(input("How many serial codes are you looking for? \n"))
    with open("demofile2.txt.", 'w') as text_file:
        for _ in range(count):
            print('-'.join(''.join(random.choice(seq) for _ in range(5)) for _ in range(5)), file=text_file)
            # text_file.write('-'.join(''.join(random.choice(seq) for _ in range(5)) for _ in range(5)) + '\n')

        print("\nCreated {} serial keys.".format(count), file=text_file)
        # text_file.write("\nCreated {} serial keys.\n".format(count))

if __name__ == '__main__':
    main()