How to check if file exists in Eiffel

How to check if file exists in Eiffel

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How to check if file exists in Eiffel
Tag : development , By : Novi Indrayani
Date : November 28 2020, 04:01 AM

seems to work fine You can use {FILE_UTILITIES}.file_exists (the_file_name)
or (create {RAW_FILE}.make_with_name (the_file_name)).exists

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Python: Check if file from list exists, execute function only if it exists

Tag : python , By : user107021
Date : March 29 2020, 07:55 AM
I wish did fix the issue. You have a couple problems in your code.
First, chkifexists is returning as soon as it finds an existing file, so it never checks any remaining names; also, if no files are found then the hashcolumn and filepathNum are never set -- giving you the UnboundLocalError.
import os, csv

# store file attributes for easy modifications
# format is 'filename': (hashcolumn, filepathNum)
files = {
        'A.csv': (7, 5),
        'B.csv': (15, 5),
        'C.csv': (1, 0),

class NoFilesFound(Exception):
    "No .csv files were found to clean up"

def chkifexists(somefiles):
    # load all three at once, but only yield them if filename
    # is found
    filesfound = False
    for fname, (hashcolumn, filepathNum) in somefiles.items():
        if os.path.isfile(fname):
            filesfound = True
            yield fname, hashcolumn, filepathNum
    if not filesfound:
        raise NoFilesFound

def removedupes(infile, outfile, hashcolumn, filepathNum):
    # this is now a single-run function
    r1 = file(infile, 'rb')
    r2 = csv.reader(r1)
    w1 = file(outfile, 'wb')
    w2 = csv.writer(w1)
    hashes = set()
    for row in r2:
        if row[hashcolumn] =="": 
        if row[hashcolumn] not in hashes:

def bakcount(origfile1, origfile2):
    '''This function creates a .bak file of the original and does a row count
    to determine the number of rows removed'''
    os.rename(origfile1, origfile1+".bak")
    count1 = len(open(origfile1+".bak").readlines())
    #print count1

    os.rename(origfile2, origfile1)
    count2 = len(open(origfile1).readlines())
    #print count2

    print str(count1 - count2) + " duplicate rows removed from " \
        + str(origfile1) +"!"

def CleanAndPrettify():
    print "Removing duplicate rows from input files..."
        for fname, hashcolumn, filepathNum in chkifexists(files):
                   os.path.splitext(fname)[0] + "2.csv",
            bakcount (fname, os.path.splitext(fname)[0] + "2.csv")
    except NoFilesFound:
        print "no files to clean up"

def chkifexists(somefiles):
    # load all three at once, but only yield them if filename
    # is found
    for fname, (hashcolumn, filepathNum) in somefiles.items():
        if os.path.isfile(fname):
            filesfound = True
            yield fname, hashcolumn, filepathNum

def CleanAndPrettify():
    print "Removing duplicate rows from input files..."
    found_files = list(chkifexists(files))
    if not found_files:
        print "no files to clean up"
        for fname, hashcolumn, filepathNum in found_files:

Python check if file exists doesnt work although the file DO exists

Tag : python , By : nabbed
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , The reason is probably / in the beginning of '/outputs/topologia_wynik' + str(file_id) + '.top'. It means "outputs" folder should be under the root folder, and in your case it seems to be under the server working directory.
Why not pass os.path.join(app.config['OUTPUT_FOLDER'], 'topologia_wynik' + str(file_id) + '.top') to os.path.isfile() as you did with the input file name?

Check if a .txt file exists. FileWriter.exists method not working

Tag : java , By : Robby
Date : March 29 2020, 07:55 AM
To fix the issue you can do SOLVED!!! for the hand guys got it working. Appreciate it! , You have compilation error here:
FileWriter userData = new FileWriter(fileName);
if (userData.exists())
File userDataFile = new File(fileName);
if (userDataFile.exists())
FileWriter userData = new FileWriter(userDataFile);
userData.write(user + " ");
System.out.println(new File(fileName).getAbsolutePath());

VB.NET: XMLWriter() check if directory exists and if file exists, otherwise create them

Tag : .net , By : jedameron
Date : March 29 2020, 07:55 AM
I hope this helps . I am running into a small bug in a vb.net console application I am working with right now. , This should work for you:
' Exctract the directory path
Dim xmlSaveDir=System.IO.Path.GetDirectoryName(xmlSaveLocation)

' Create directory if it doesn't exit
If (Not System.IO.Directory.Exists(xmlSaveDir)) Then
End If

' now, use a file stream for the XmlWriter, this will create or overwrite the file if it exists
Using fs As New FileStream(xmlSaveLocation, FileMode.OpenOrCreate, FileAccess.Write)
    Using writer As XmlWriter = XmlWriter.Create(fs)
        ' use the writer...
        ' and, when ready, flush and close the XmlWriter
    End Using
    ' flush and close the file stream
End Using

Eiffel: void safety, a concise way to test if an object exists and then call its feature

Tag : development , By : flesk
Date : March 29 2020, 07:55 AM
should help you out To avoid code duplication and multiple tests, the following code could be used:
l_foo := foo
if not attached l_foo then
    create l_foo
    foo := l_foo
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