Re: [Tutor] Fw: path string

[Alan Gauld via Tutor]

On 03/01/17 15:59, anatta anatta wrote:

> Please disregard my request below.
> 
> I know the problem!
> 
> I have not defined the variable in question as a global variable.

That's one solution but its not a very good one.

Global variables are not considered good practice for many
reasons. In particular, they make code reuse difficult and
if you ever need to use your code in a multi-threaded
environment, to improve performance say, they are nearly
impossible to work with.

It's much better to pass the required value out of the function
as a return value.

> regret the inconvenience caused.

No inconvenience, its what the list is here for! :-)

hth
-- 
Alan G
Author of the Learn to Program web site
http://www.alan-g.me.uk/
http://www.amazon.com/author/alan_gauld
Follow my photo-blog on Flickr at:
http://www.flickr.com/photos/alangauldphotos


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[Tutor] Fw: path string

[anatta anatta]

Dear Tutor,

Please disregard my request below.

I know the problem!

I have not defined the variable in question as a global variable.


regret the inconvenience caused.


Best.

Kumar.

+



From: anatta anatta 
Sent: Monday, January 2, 2017 5:01 PM
To: tutor@python.org
Subject: path string

Dear Tutor.

I am trying to create unsuccessfully source path as a string 'str7' in part_1 
of the code below, to be used in part_2 of the code.
When I define the source path explicitly in part_2 of the code (#sourcePath = 
r'H://TCVFLDAT'), the code works right.
How else could I find the path in part-1 and use it in part 2?

##
Here is my code:
##


# -*- coding: utf-8 -*-
"""
Created on Wed Jun 01 17:05:07 2016

@author: anatta
"""


# Required module
import os
import shutil
###part_1 ### looking for files to be copied and obtaining source path  ###
# Function for getting files from a folder
def fetchFiles(pathToFolder, flag, keyWord):
''' fetchFiles() requires three arguments: pathToFolder, flag and
 keyWord flag must be 'STARTS_WITH' or 'ENDS_WITH' keyWord is a string to
  search the file's name  Be careful, the keyWord is case sensitive and must
  be exact.  Example: fetchFiles('/Documents/Photos/','ENDS_WITH','.jpg')
returns: _pathToFiles and _fileNames '''

_pathToFiles = []
_fileNames = []

for dirPath, dirNames, fileNames in os.walk(pathToFolder):
if flag == 'ENDS_WITH':
selectedPath = [os.path.join(dirPath,item) for item in 
fileNames if item.endswith(keyWord)]
_pathToFiles.extend(selectedPath)

selectedFile = [item for item in fileNames if 
item.endswith(keyWord)]
_fileNames.extend(selectedFile)

elif flag == 'STARTS_WITH':
selectedPath = [os.path.join(dirPath,item) for item in 
fileNames if item.startswith(keyWord)]
_pathToFiles.extend(selectedPath)

selectedFile = [item for item in fileNames if 
item.startswith(keyWord)]
_fileNames.extend(selectedFile)

else:
print fetchFiles.__doc__
break

# Try to remove empty entries if none of the required files are 
in directory
try:
_pathToFiles.remove('')
_imageFiles.remove('')
except ValueError:
pass

# Warn if nothing was found in the given path
#if selectedFile == []:
#print 'No files with given parameters were found 
in:\n', dirPath, '\n'

#print len(_fileNames), 'files were found is searched folder(s)'

#return _pathToFiles, _fileNames
#print _pathToFiles, _fileNames
print 'path to first tuple file is:', _pathToFiles [0]
str1 = ' '.join(_pathToFiles [0]) #convert tuple element 0 to string
print 'length of str1 is: ', len (str1)
str2 = str1.replace(" ", "") #remove white spaces
print 'str2 is', str2
str3 = str2[13:16] #extract rgeistration
print 'str3 is registration:', str3


str4 = 'FLDAT'
print 'str4 is: ', str4
str5 = str3.__add__(str4)
print 'str 5 is: ',str5
str6 = 'H://'
print 'str6 is: ', str5
str7 = str6.__add__(str5)
print 'str7 is: ', str7

#print _fileNames
print 'Number of files found: ', len(_fileNames)
fetchFiles('H://','ENDS_WITH','.FLD')

 part_2  copying files from sourcePath to destPath

#sourcePath = r'H://TCVFLDAT'
sourcePath = r'str7'
print 'Source path is: ', sourcePath
destPath = r'c://test_o/'
print 'Destination path is: ', destPath
#ls=os.listdir('.')#list current dir
#print('listing current dir\n')
#print(ls)
for root, dirs, files in os.walk(sourcePath):

#figure out where we're going
dest = destPath + root.replace(sourcePath, '')

#if we're in a directory that doesn't exist in the destination folder
#then create a new folder
if not os.path.isdir(dest):
os.mkdir(dest)
print 'Directory created at: ' + dest
else:
print 'Directory already exists:' + dest

for root, dirs, files in os.walk(sourcePath):
#figure out where we're going
dest = destPath + root.replace(sourcePath, '')
filetype = '.FLD'# name the file ext to be copied
print 'All files of this type will be copied', filetype
#loop through all files in the directory
for f in files:

#compute current (old) & new file locations
oldLoc = root + '\\' + f
newLoc = dest + '\\' + f
#print 'Old location is:', oldLoc
#print 'New location is:', newLoc

if not os.path.isfile(newLoc):
try: