Question

伙计们在python 2.7中看到下面的代码。我遇到了“print（ciphertext）”和“sys.stdout.write（ciphertext）”部分代码的问题当我运行代码时，“print（passline）和”sys.stdout.write（passline）“出来很好，即如果文件有一行显示”Billz“，它将按原样显示，但是当我尝试输出时函数（即sys.stdout.write（）和print（））密文（通过encryptMessage（密钥，消息）方法）输出根据“myKey”变量分割不同的行（参见下面的代码和示例）

*我理解转置加密方法的局限性，但是'ciphertext'在原始行完成从它开始的行输出行之前到达新行

我认为问题在于encryptMessage（）函数以及它与enc（）方法的交互方式，特别是for ... in ...代码块

这有意义吗？

我认为对此的答案可以提供帮助 - 从文件中读取数据但不覆盖这些文件 - 尝试编写与日志，密码/单词列表相关的程序时 - 并了解for，in和.join如何协同工作

i.e. myKey = 1
C:\Users\baawan\Desktop\Cyber Sec\COMP_lang\python>py cypher7.py
would you like to Encrypt(e) or Decrypt(d): e
Enter file name: pass.txt
Enter Key: 1
This is a list of Passwords to be encrypted

This is a list of Passwords to be encrypted

Billz786

Billz786

123456

123456

Milly

Milly

Bilklzcfvcx
Bilklzcfvcx

i.e. myKey = 2

C:\Users\baawan\Desktop\Cyber Sec\COMP_lang\python>py cypher7.py
would you like to Encrypt(e) or Decrypt(d): e
Enter file name: pass.txt
Enter Key: 2
This is a list of Passwords to be encrypted

Ti sals fPswrst eecytdhsi  ito asod ob nrpe

Billz786

Blz8
il76
123456

135
246
Milly

Mlyil

Bilklzcfvcx
Bllcvxikzfc

i.e. myKey = 4

C:\Users\baawan\Desktop\Cyber Sec\COMP_lang\python>py cypher7.py
would you like to Encrypt(e) or Decrypt(d): e
Enter file name: pass.txt
Enter Key: 4
This is a list of Passwords to be encrypted

T asfsrtecthi t sdo reisl Pws eyds ioao bnp

Billz786

Bz
i7l8l6
123456

15263
4
Milly

Myi
ll
Bilklzcfvcx
Blvizclcxkf

i.e. myKey = 8
C:\Users\baawan\Desktop\Cyber Sec\COMP_lang\python>py cypher7.py
would you like to Encrypt(e) or Decrypt(d): e
Enter file name: pass.txt
Enter Key: 8
This is a list of Passwords to be encrypted

Tafreth  d eilPsedsia n
 sstcitsors w y oobp
Billz786

B
illz786
123456

123456

Milly

Milly

Bilklzcfvcx
Bviclxklzcf

代码是

def enc():
    myMessage = raw_input('Enter file name: ')
    myKey = int(raw_input('Enter Key: '))
    text_file = open(myMessage, "r")
    lines = text_file.readlines()
    for passline in lines:
        myMessage = passline
        ciphertext = encryptMessage(myKey, myMessage)
        print(passline)
        #sys.stdout.write(passline)
        print ciphertext
        #sys.stdout.write(ciphertext)
    text_file.close()
def encryptMessage(key, message):
    ciphertext = [''] * key
    for col in range(key):
        pointer = col
        while pointer < len(message):
            ciphertext[col] += message[pointer]
            pointer += key
    return ''.join(ciphertext)

Answer 1

当使用readlines和大多数其他方式读取文件中的行时，python包含行中的换行符（因此，在您的情况下，passline包含（a）换行符（ S））。为防止这种情况，请在for循环的开头使用passline = passline.rstrip('\n\r')之类的内容

Python print（）和sys.stdout.write（）问题

1 个答案: