module `loghelper.flog`¶

Short summary¶

module pyquickhelper.loghelper.flog

logging functionalities

The function fLOG (or fLOG) is used to logged everything into a log file.

from pyquickhelper.loghelper.flog import fLOG
fLOG(OutputPrint = True)                  # the logs are also displayed in the output stream
fLOG(LogPath     = "...")                 # chanages the path returned by GetPath
fLOG("un", "deux", 4, ["gt"])             # log everything in a log file

from pyquickhelper.loghelper.flog import GetPath ()
print GetPath()                           # return the log path (file temp_log.txt)

fLOG(LogPath = "c:/temp/log_path")        # change the log path, creates it if it does not exist

Functions¶

function	truncated documentation
`_check_source`	Check the existence of a file, downloads it if not existing.
`_check_url_file`	If url is an url, download the file and return the downloaded if it has already been downloaded, it is not downloaded …
`_check_zip_file`	This function tests if a file is a zip file (extension zip), if it is the case, it unzips it into another file and return …
`_first_more_recent`	Checks if the first file (opened url) is more recent of the second file (path).
`_get_file_txt`	build a filename knowing an url, same name but in default_path
`_get_file_url`	build a filename knowing an url
`_this_fLOG`	Other name private to this module.
`download`	Download a file to the folder path_unzip if not present, if the downloading is interrupted, the next time, it will start …
`fLOG`	Builds a message on a single line with the date, it deals with encoding issues.
`fLOGFormat`	Formats a message.
`get_default_value_type`
`get_prefix`	Returns a prefix for a file based on time.
`get_relative_path`	private function, return the relative path or absolute between a folder and a file, use relpath …
`GetLogFile`	Returns a file name containing the log
`GetPath`	returns a path where the log file is stored.
`GetSepLine`	Always returns `\n`
`guess_machine_parameter`	Determines many parameters on this machine:
`guess_type_list`	guess the type of a list
`guess_type_value`	Guessees the type of a value.
`guess_type_value_type`
`init`	initialisation
`IsEmptyString`	Empty string or not?
`load_content_file_with_encoding`	Tries different encoding to load a file, tries utf8, latin1 and None.
`noLOG`	does nothing
`Print`	if True, redirect everything which is displayed to the standard output
`removedirs`	Removes all files and folders in folder.
`unzip`	Unzips a file into the temporary folder, the function expects to have only one zipped file.

Documentation¶

logging functionalities

The function fLOG (or fLOG) is used to logged everything into a log file.

from pyquickhelper.loghelper.flog import fLOG
fLOG(OutputPrint = True)                  # the logs are also displayed in the output stream
fLOG(LogPath     = "...")                 # chanages the path returned by GetPath
fLOG("un", "deux", 4, ["gt"])             # log everything in a log file

from pyquickhelper.loghelper.flog import GetPath ()
print GetPath()                           # return the log path (file temp_log.txt)

fLOG(LogPath = "c:/temp/log_path")        # change the log path, creates it if it does not exist

Warning

This module inserts static variable in module sys. I was done to deal with several instances of the same module in earlier versions of python.

source on GitHub

pyquickhelper.loghelper.flog.GetLogFile(physical=False, filename=None)[source]¶

Returns a file name containing the log

Parameters

physical – use a physical file or not
filename – file name (if physical is True, default value is temp_log.txt)

Returns

a pointer to a log file

Return type

str

Raises

OSError – if this file cannot be created

source on GitHub

pyquickhelper.loghelper.flog.GetPath()[source]¶

returns a path where the log file is stored.

Returns: path to the logs

source on GitHub

pyquickhelper.loghelper.flog.GetSepLine()[source]¶

Always returns \n

source on GitHub

pyquickhelper.loghelper.flog.IsEmptyString(s)[source]¶

Empty string or not?

Parameters: s – any string (str, None)
Returns: is it empty or not?
Return type: bool
Raises: PQHException – when a type is unexpected

source on GitHub

pyquickhelper.loghelper.flog.Print(redirect=True)[source]¶

if True, redirect everything which is displayed to the standard output

source on GitHub

pyquickhelper.loghelper.flog._check_source(fileurl, path_unzip, outfile, flatten=True, fLOG=<function noLOG>)[source]¶

Check the existence of a file, downloads it if not existing.

Parameters

fileurl – can be an url, a zip file, a text file
path_unzip – if None, unzip the file where it stands, otherwise, put it in path
outfile – if None, the function will assign a filename unless this parameter is specified
flatten – extract all files into the same directory
fLOG – logging function

Returns

a text file name

if it is:

an url: download it and copy it into default_path
a zipfile: beside the true file
a text file: do nothing

If the file has already been downloaded and unzipped, it is not done twice.

source on GitHub

pyquickhelper.loghelper.flog._check_url_file(url, path_download, outfile, fLOG=<function noLOG>)[source]¶

If url is an url, download the file and return the downloaded if it has already been downloaded, it is not downloaded again.

Parameters

url – url
path_download – download the file here
outfile – if None, the function will assign a filename unless this parameter is specified
fLOG – logging function

Returns

the filename

source on GitHub

pyquickhelper.loghelper.flog._check_zip_file(filename, path_unzip, outfile, flatten=True, fLOG=<function noLOG>)[source]¶

This function tests if a file is a zip file (extension zip), if it is the case, it unzips it into another file and return the new name, if the unzipped file already exists, the file is not unzipped a second time.

Parameters

filename – any filename (.zip or not), if txt, it has no effect
path_unzip – if None, unzip it where it stands, otherwise, place it into path
outfile – if None, the function will assign a filename unless this parameter is specified
flatten – unzip all files into the same directory
fLOG – logging function

Returns

the unzipped file or filename if the format was not zip

source on GitHub

pyquickhelper.loghelper.flog._first_more_recent(f1, path)[source]¶

Checks if the first file (opened url) is more recent of the second file (path).

Parameters

f1 – opened url
path – path name

Returns

boolean

source on GitHub

pyquickhelper.loghelper.flog._get_file_txt(zipname)[source]¶

build a filename knowing an url, same name but in default_path

Parameters: zipname – filename of the zip
Returns: filename

source on GitHub

pyquickhelper.loghelper.flog._get_file_url(url, path)[source]¶

build a filename knowing an url

Parameters

url – url
path – where to download the file

Returns

filename

source on GitHub

pyquickhelper.loghelper.flog._this_fLOG(*args, **kwargs)[source]¶

Other name private to this module.

source on GitHub

pyquickhelper.loghelper.flog.download(httpfile, path_unzip=None, outfile=None, flatten=True, fLOG=None)[source]¶

Download a file to the folder path_unzip if not present, if the downloading is interrupted, the next time, it will start from where it stopped. Before downloading, the function creates a temporary file, which means the downloading has began. If the connection is lost, an exception is raised and the program stopped. Next time, the program will detect the existence of the temporary file and will start downloading from where it previously stopped. After it ends, the temporary file is removed.

Parameters

httpfile – (str) url
path_unzip – (str) path where to unzip the file, if None, choose GetPath ()
outfile – (str) if None, the function will assign a filename unless this parameter is specified
flatten – (bool) put all files in the same folder (forget subfolders)
fLOG – (str) logging function

Returns

local file name

source on GitHub

pyquickhelper.loghelper.flog.fLOG(*args, **kwargs)[source]¶

Builds a message on a single line with the date, it deals with encoding issues.

Parameters

args – list of fields
kwargs – dictionary of fields (see below)

Raises

OSError – When the log file cannot be created.

About parameter p:

if p contains OutputPrint, call Print(OutputPrint)
if p contains LogPath, it calls init(v)
if p contains LogFile, it changes the log file name (it creates a new one, the previous is closed).
if p contains LogPathAdd, it adds this path to the temporary file
if p contains Lock, it locks option OutputPrint
if p contains UnLock, it unlocks option OutputPrint
if p contains _pp, it uses pprint

Example:

fLOG (LogPath = "###", LogPathAdd = __file__, OutputPrint = True)

How to activate the logs?

The following instruction will do:

fLOG(OutputPrint=True)

To log everything into a file:

fLOG(OutputPrint=True, LogFile="log_file.txt")

Parameter OutputStream allows to print the message on a different stream.

source on GitHub

pyquickhelper.loghelper.flog.fLOGFormat(sep, *args, **kwargs)[source]¶

Formats a message.

Parameters

sep – line separator
args – list of anything
kwargs – dictioanry of anything

Returns

string

if _pp is True, the function uses pprint.

source on GitHub

pyquickhelper.loghelper.flog.get_default_value_type(ty, none=True)[source]¶

Parameters

ty – type in guess_type_value_type
none – if True and all values are empty, return None

Returns

a default value for this type

source on GitHub

pyquickhelper.loghelper.flog.get_prefix()[source]¶

Returns a prefix for a file based on time.

source on GitHub

pyquickhelper.loghelper.flog.get_relative_path(folder, file, exists=True, absolute=True)[source]¶

private function, return the relative path or absolute between a folder and a file, use relpath

Parameters

folder – folder
file – file
exists – check existence
absolute – if True return a path which starts from the root

Returns

relative path

Return type

str

source on GitHub

pyquickhelper.loghelper.flog.guess_machine_parameter()[source]¶

Determines many parameters on this machine: - machine name - user name - domain…

Returns: dictionary { name : value }

source on GitHub

pyquickhelper.loghelper.flog.guess_type_list(args, tolerance=0.01, none=True)[source]¶

guess the type of a list

Parameters

args – list
tolerance – let’s denote m as the frequency of the most representative type, and m2 the second one, if m2 > m * tolerance –> str
none – if True and all values are empty, return None

Returns

type, length (order of preference (int, float, str)) the parameter length has a meaning only for str result

source on GitHub

pyquickhelper.loghelper.flog.guess_type_value(x, none=None)[source]¶

Guessees the type of a value.

Parameters

x – type
none – if True and all values are empty, return None

Returns

type

Warning

if an integer starts with a zero, then it is a string

source on GitHub

pyquickhelper.loghelper.flog.guess_type_value_type(none=True)[source]¶

Parameters: none – if True and all values are empty, return None
Returns: the list of types recognized by guess_type_value

source on GitHub

pyquickhelper.loghelper.flog.init(path=None, filename=None, create=True, path_add=None)[source]¶

initialisation

Parameters

path – new path, if path==*”###”*, then uses d:\temp\log_pyquickhelper if it exists or c:\temp\log_pyquickhelper if not
filename – new filename
create – force the creation
path_add – subfolder to append to the current folder

This function is also called when LogPath is specified while calling function fLOG.

source on GitHub

pyquickhelper.loghelper.flog.load_content_file_with_encoding(filename)[source]¶

Tries different encoding to load a file, tries utf8, latin1 and None.

Parameters: filename – filename
Returns: couple (content, encoding)

source on GitHub

pyquickhelper.loghelper.flog.noLOG(*args, **kwargs)[source]¶

does nothing

source on GitHub

pyquickhelper.loghelper.flog.removedirs(folder, silent=False, use_command_line=False)[source]¶

Removes all files and folders in folder.

Parameters

folder – folder
silent – silent mode or not
use_command_line – see below

Returns

list of not remove files or folders

Sometimes it fails due to PermissionError exception, in that case, you can try to remove the folder through the command line rmdir /q /s + <folder>. In that case, the function does not return the list of removed files but the output of the command line

source on GitHub

pyquickhelper.loghelper.flog.unzip(file, path_unzip=None, outfile=None, flatten=True, fLOG=<function noLOG>)[source]¶

Unzips a file into the temporary folder, the function expects to have only one zipped file.

Parameters

file – (str) zip files
path_unzip – (str) where to unzip the file, if None, choose GetPath ()
outfile – (str) if None, the function will assign a filename unless this parameter is specified
flatten – (bool) put all files in the same folder (forget subfolders)

Returns

expanded file name

source on GitHub

module `loghelper.flog`¶

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module loghelper.flog¶

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Functions¶

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module `loghelper.flog`¶