Python
How to Use Python to Monitor Files and Processes With psutil
Monitor processes, memory, disk and open files from Python with psutil: list top processes, check a service, watch CPU and alert on thresholds.
6 min read
Tag
python
30 posts
Python
How to Use Python to Parse CSV and Excel Files for Reports
Parse CSV and Excel files in Python to build reports: csv.DictReader, grouping totals, writing a summary, handling encodings, and reading xlsx with openpyxl.
6 min read
Python
How to Use jq Style Queries in Python on JSON With Examples
Query JSON in Python the way jq does: load, walk nested keys safely, filter lists, group and count, and handle missing keys without KeyError.
6 min read
Python
Python Subprocess Pipe Deadlock and Hanging Processes
Fix a Python subprocess that hangs: pipe buffer deadlocks with wait, missing communicate, stdin prompts, timeouts, and killing process groups.
6 min read
Automation
How to Use Python Pexpect for Interactive Automation
Use Python Pexpect to spawn programs, wait for prompts, send replies, handle timeouts and EOF, run SSH commands, and log the session for debugging.
6 min read
Python
How to Use Python One Liners From the Shell With Examples
Use python -c one liners from the shell: format JSON, encode and decode, do math, generate passwords and serve files, with quoting tips for Bash.
7 min read
Python
How to Replace a Bash Deploy Script With Python Step by Step
Replace a Bash deploy script with Python: subprocess with check=True, release directories and symlink swaps, health checks, rollback and clear logging.
7 min read
Python
How to Replace a Bash Backup Script With Python the Safe Way
Replace a Bash backup script with Python: pathlib, tarfile, timestamped names, retention, error handling and logging, with a note on when Bash is enough.
6 min read
Python
How to Test Python CLI Scripts With pytest Step by Step
Test a Python command line script with pytest: call main() directly, use capsys and tmp_path, check exit codes, and run the real entry point with subprocess.
6 min read
Python
Python Subprocess Called Process Error and Exit Status
Handle Python CalledProcessError from subprocess.run: read returncode, stdout and stderr, understand exit codes, and decide when to use check.
6 min read
Python
subprocess vs sh vs plumbum for Running Commands in Python
Compare subprocess, the sh library and plumbum for running commands in Python: syntax, errors, piping, portability and security, with the same task in each.
6 min read
Python
Click vs Typer vs argparse for Python CLIs and Which to Pick
Compare Click, Typer and argparse for Python command-line tools: size, type hints, subcommands, dependencies and testing, with the same example in each.
6 min read