🖥️python

➡️This is a command-line reference manual for commands and command combinations that you don’t use often enough to remember it. This cheatsheet explains the python command with important options and switches using examples.

3 minute read

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# Desc: Python is a high-level programming language.
# and python is a Python interpreter.

# Basic example of server with python
# Will start a Web Server in the current directory on port 8000
# go to http://127.0.0.1:8000

# Python v2.7
python -m SimpleHTTPServer
# Python 3
python -m http.server 8000

# SMTP-Server for debugging, messages will be discarded, and printed on stdout.
python -m smtpd -n -c DebuggingServer localhost:1025

# Pretty print a json
python -mjson.tool

python -m SimpleHTTPServer 
# Start a web server on port 8000 that uses CWD. See http://bit.ly/CLIhttpd  for other language examples. The command generates a simple web page over HTTP for the directory structure tree and can be accessed at port 8000 in browser till interrupt signal is sent.

python -c "for path in '%CLASSPATH%'.split(';'): print path"
# Use Python to print all the variable names on one line - note this can futz up some pathnames

python -c "import csv,json;print json.dumps(list(csv.reader(open('csv_file.csv'))))"
# Convert CSV to JSON - Replace 'csv_file.csv' with your filename.

echo "$(python -V 2>&1)" > file
or 
python -V 2> file
# Python version to a file
# This command sent the Python version to a file. This is intended to be used in scripts. For some reason, simple redirections didn't work with "python -V" This is sample output 
	cat file
	Python 2.6.3

# Zen of Python
# or just 'import this' in python
python -mthis

# See also:
#   Python language cheat sheets at /python/
#   list of pages:      /python/:list
#   learn python:       /python/:learn
#   search in pages:    /python/~keyword

# Get load average in a more parse-able format
python -c 'import os; print os.getloadavg()[0]'
# Explanation: In short, it runs a Python one-line script which imports the 'os' module and uses it to get the load average. It then indexes into a tuple, using the index of zero. The tuple is like this: (one-minute-average, five-minute-average, fifteen-minute-average), so you could substitute 0 for 1 to get the five minute load average, or 2 to get the fifteen minute load average. I find this really useful when writing larger bash one-liners which require this information, as I do not have to parse the output of uptime.
# Limitations: Requires Python.

# Random 6-digit number
python -c 'import random; print(random.randint(0,1000000-1))'
# Explanation: Stackoverflow has a dozen different ways to generate numbers, all of which fall apart after 3-4 digits. This solution requires Python to be installed, but is simple and direct.
# Limitations: Requires Python, it's not a pure-Bash solution

python -m ensurepip --default-pip && python -m pip install --upgrade pip setuptools wheel
# Bootstrap python-pip & setuptools

#==============================##==============================#
# CMD PYTHON						       #
#==============================##==============================#

Cheatsheets are an excellent complement to other information sources like Linux man-pages, Linux help, or How-To’s and tutorials, as they provide compact and easily accessible information. While man-pages and detailed tutorials often contain comprehensive explanations and extensive guides, cheatsheets summarize the most important options forthe command python in a clear format. This allows users to quickly access the needed information for python without having to sift through lengthy texts. Especially in stressful situations or for recurring tasks, cheatsheets for python are a valuable resource to work efficiently and purposefully.

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