Python print() and sys.stdout.write() issues - python-2.7

Question

Guys see below code in python 2.7.
I'm having issues with the "print(ciphertext)" and the "sys.stdout.write(ciphertext)" parts of the code
when I run the code the "print(passline) and the "sys.stdout.write(passline)" come out fine i.e. if the file has a line that says "Billz" it will show as is but when I try to output using either function(i.e. sys.stdout.write() and print()) the ciphertext(via the encryptMessage(key, message) method)
the output splits across lines depending on the "myKey" variable (see below for code and example)
*I understand the limitations of the transposition encryption method, but the 'ciphertext' going to a new line before the original line has finished outputting the line from the line it started from
I think the problem is with the encryptMessage() function and how it interacts with the enc() method, i.e. the for ...in... block of the code in particular
Does that make sense?
i think the answer to this can help when
-reading data from files but not overwriting those files
-when trying to code programmes related to logs, password/word lists
-and understand how the for, in and .join works together
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
the code is
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

When using readlines and most other ways of reading lines in files, python includes the newline character(s) in the line (So, in your case, passline contains (a) newline character(s)). To prevent this, use something like passline = passline.rstrip('\n\r') in the start of your for loop