Useful tips and tricks in Python #

TEMPLATE or Skeleton script with tips and references #

This can be found in TEMPLATE.py which is in the Script_Yard repo

Generate requirements.txt #

JCharisTech¹

pip3 install pipreqs
pipreqs /path/to/project
# OR
pipreqs $(pwd)
# Manually check the requirements.txt also by installing pip3 install -r requirements.txt

Update all pip packages #

1 2	`python3 -m pip install --upgrade pip pip3 list --outdated --format=freeze \| grep -v '^\-e' \| cut -d = -f 1 \| xargs -n1 pip3 install -U`

Global Variables #

# Below "import" <insert_package_names>
timeout = None

def imAFunction():
  if i > timeout:
    print("Greater than timeout")

# Inside function. In this example main()
global timeout 
timeout = args.timeout

URL Encode Python String #

import urllib.parse
action = urllib.parse.quote_plus("GET_[TO]-THE")
location = urllib.parse.quote_plus("CHOPP@!")
url = "www.domain.com:2323/whatever?action=%s&location=%s" % (action,location)

Accept custom certificate #

When using proxy (i.e. Burp), rather than using verify=False in the request.get or request.post, convert the Burp certificate cacert.der instead to cacert.pem then use in on python requests. ²

Most common use case is the usage of burp certificate for python requests SSL error.

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# Converting cacert.der to cacert.pem
# openssl x509 -in cacert.der -inform DER -outform PEM -out cacert.pem
r = session.post(burp0_url, headers=burp0_headers, data=burp0_data,proxies=proxies,verify="cacert.pem")

Last update: October 10, 2021