CycleLog

This library will let you log into a cyclic file easily.

What is a cycle log?

• A cycle log is a log file which does not keep more than N lines, once the log reaches N lines the logger will delete older lines from the beginning, so you can only have latest logs which you need to figure out the error, to reproduce last steps, and such.

basic example:

from CycLog import CycleLogger

logger = CycleLogger(
    file_name="your_project.log"
)
for i in range(10):
    logger.log(i)

which will be logged:

[27/01/2021 - 19:36] : 0
[27/01/2021 - 19:36] : 1
[27/01/2021 - 19:36] : 2
[27/01/2021 - 19:36] : 3
[27/01/2021 - 19:36] : 4
[27/01/2021 - 19:36] : 5
[27/01/2021 - 19:36] : 6
[27/01/2021 - 19:36] : 7
[27/01/2021 - 19:36] : 8
[27/01/2021 - 19:36] : 9

Since the default max lines is 500, we got the entire log. let's try to change it to 5:

from CycLog import CycleLogger

logger = CycleLogger(
    file_name="your_project.log",
    max_lines=5
)
for i in range(10):
    logger.log(i)

And now we only get the last 5 lines.

[27/01/2021 - 19:38] : 5
[27/01/2021 - 19:38] : 6
[27/01/2021 - 19:38] : 7
[27/01/2021 - 19:38] : 8
[27/01/2021 - 19:38] : 9

In principle, you can give any object that has __str__ method, logger.log converts implicitly any object to string.

Few more settings:

include_date: bool, default: True

determines whether to add time to log message or not. it affects the format message only in case of the format message is the default.

for example, without date, a typical message will look:

[19:38] : 9

include_time: bool, default: True

determines whether to add date to log message or not. it affects the format message only in case of the format message is the default.

for example, without time, a typical message will look:

[27/01/2021] : 9

if both include_time and include_date will be False, a log will only show the message itself.

logger.log("hello") will log hello, without date or time.

max_lines: int, default: 500.

Determines the maximum of lines in a file.

message_format: str, default: "[{date} - {time}] : {message}"

you can set it to your own message and then you can add keyword arguments to logger.log, for example:

from CycLog import CycleLogger

logger = CycleLogger(
   file_name="your_project.log",
   max_lines=5,
   message_format=CycleLogger.MESSAGE_FORMAT + " [from {name} - {n}]"
)
for i in range(10):
   logger.log(i, name="Jonatan", n=i)

will be

[27/01/2021 - 19:50] : 6 [from Jonatan - 6]
[27/01/2021 - 19:50] : 7 [from Jonatan - 7]
[27/01/2021 - 19:50] : 8 [from Jonatan - 8]
[27/01/2021 - 19:50] : 9 [from Jonatan - 9]

date_format: str, default: "%d/%m/%Y"

Determines how the date will look.

time_format: str, default: "%H:%M"

Determines how the time will look.

file_mode: str, default: a+

A mode to open the file in, the mode must be writable and readable. you can see a list of modes and explanation: https://docs.python.org/3/library/functions.html#open