lk-logger 5.0.1

Python advanced print with varnames.

LK Logger

Advanced print tool for Python.

Features:

• Simple. Add two lines of code to enable lk-logger.

  import lk_logger
  lk_logger.setup()
  

  It will replace Python's built-in print function to take care all the leftovers.

• Non-intrusive. After enable it like above, no more modifications on your source code projects (this is low-cost and low-effort migration). You will see new effects at once.

  This would be a good choice for developers who have already dived into their own projects with Python print too much to get a new start with a new logging tool.

• Code highlight.

  

• Show both varnames and values.

  before:

  a, b = 1, 2
  print('a = {}, b = {}, a + b = {}'.format(a, b, a + b))
  

  after:

  import lk_logger
  lk_logger.setup(show_varnames=True)
  a, b = 1, 2
  print(a, b, a + b)
  

  

Install

pip install lk-logger

The latest version is 5.0.0 or higher.

Quick Start

import lk_logger
lk_logger.setup(show_varnames=True)

print('hello world')

a, b = 1, 2
print(a, b, a + b)

print(a, b, (c := a + b), c + 3)

Screenshot:

Advanced Usage

Generally, the two lines of code above are enough to use.

The advanced feature is its "markup" shorthand.

Use a markup as in the first or the last parameter, the markup is a string that starts with ':', consists of multiple marks.

For example:

print(':i', 'monday')
print(':i', 'tuesday')
print(':i', 'wednesday')

It prints weekdays with a numeric prefix:

Another one:

print('this is a divider', ':d')

print(':v0', 'this is a TRACE message')
print(':v1', 'this is a DEBUG message')
print(':v2', 'this is a INFO  message')
print(':v3', 'this is a WARN  message')
print(':v4', 'this is a ERROR message')
print(':v5', 'this is a FATAL message')

Here is a list of all available marks:

Mark	Description
:d	divider line
:i	index
:l	long / loose format (multiple lines)
:p	parent layer
:r	rich format
:s	short / single line format
:t	timestamp (not available in current version)
:v	verbosity / log level

Markup options:

:d0     default divider line (default)
:d1+    user defined (if not, fallback to :d0)

:i0     reset index
:i1     number width fixed to 1 (1, 2, 3, ... 9, 10, 11, ...) (default)
:i2     number width fixed to 2 (01, 02, 03, ..., 99, 100, 101, ...)
:i3     number width fixed to 3 (001, 002, 003, ..., 999, 1000, 1001, ...)
:i4+    number width fixed to *
:i9+    reserved, not defined yet (will be fallback to :i1)

:l0     let lk-logger decides how to format long message (default)
:l1     force expand all nodes

:p0     self layer
:p1     parent layer (default)
:p2     grand parent layer
:p3     great grand parent layer
:p4     great great grand parent layer
:p5+    great great great ... grand parent layer
        note: be careful using :p2+, it may crash if the layer not exists

:v0     trace
        if you don't like using number, you can use an alias :vT
        (:vT is not supported in current version. we'll bring it soon)
:v1     debug (alias is :vD) (default)
:v2     info (alias is :vI)
:v3     warning (alias is :vW)
:v4     error (alias is :vE)
:v5     fatal (alias is :vF)
:v6+    user defined (if not, fallback to :v0)

Detailed examples:

See examples/02_all_markup_usages.py.

Screenshot:

Caution

• The back slash will be forcely converted to forward slash.

  print(r'C:\Users\<Username>\AppData\Local\Temp')
  

  

  There remained an unresolved issue in its internal parser. We will fix it in future version.