Could someone help me with this project?

Could someone help me with this project? - Printable Version

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Could someone help me with this project? - ghostheadx9 - 09-16-2018

Here is my code:

Code:
import sys, socket

try:
    rfc_number = int(sys.argv[1])
except (IndexError, ValueError):
    print('Must supply an RFC number as first argument')
    sys.exit(2)

host = 'www.ietf.org'
port = 80
sock = socket.create_connection((host, port))

req = (
    'GET/rfc/rfc{rfcnum}.txt HTTP/1.1\r\n',
    'Host: {host}:{port}\r\n',
    'User-Agent: Python {version}\r\n',
    'Connection: close\r\n',
    '\r\n'
)

req = req.format(
    rfcnum=rfc_number,
    host=host,
    port=port,
    version=sys.version.info[0]
)

sock.sendall(req.encode('ascii'))
rfc_raw = bytearray()
while True:
    buf = sock.recv(4096)
    if not len(buf):
        break
    rfc_raw += buf
rfc = rfc_raw.decode('utf-8')
print(rfc)

Could someone help me:

1. figure out what's causing the syntax error:

Code:
adam@adam-Inspiron-5558:~/.PyCharmCE2018.2/config/scratches$ python firstTCP_program.py 782
Traceback (most recent call last):
  File "firstTCP_program.py", line 21, in <module>
    req = req.format(
AttributeError: 'tuple' object has no attribute 'format'

2. understand my own code better? I really want to understand the code better so that I can reprogram it differently.

Thanks so much.

Best,

ghostheadx9

RE: Could someone help me with this project? - griimnak - 03-10-2019

Code:
req = (
    'GET/rfc/rfc{rfcnum}.txt HTTP/1.1\r\n',
    'Host: {host}:{port}\r\n',
    'User-Agent: Python {version}\r\n',
    'Connection: close\r\n',
    '\r\n'
)

req = req.format(
    rfcnum=rfc_number,
    host=host,
    port=port,
    version=sys.version.info[0]
)

The problem is with your req object.
.format() only works on single strings, req is a tuple because you used "," in between strings.

This should work for you:

Code:
"""
This is just dummy data for my test, delete this.
"""
rfcnum = "/blahblah"
host = "test"
port = 80
version = "testtest"


""" Take this req object and plug in your data here"""
req= '''
GET/rfc/rfc{}.txt HTTP/1.1
Host: {}:{}
User-Agent: Python {}
Connection: close
'''.format(rfcnum, host, port, version)

"""Just for my test, you can remove this."""
print(req)

Output:

Code:
C:\Users\griimnak\Desktop>py -2 test.py

GET/rfc/rfc/blahblah.txt HTTP/1.1
Host: test:80
User-Agent: Python testtest
Connection: close


C:\Users\griimnak\Desktop>