How to add an extension to an input filename?

[runsun]

Read from an existing file, then output a file with the same name but an extension:

file = raw_input ('Enter the filename:\n')
fileout = open ('file.out', 'w')

However, when I enter a filename like "test", it gives the output file as "file.out" instead of "test.out".

[ghostdog74]

Read from an existing file, then output a file with the same name but an extension:

file = raw_input ('Enter the filename:\n')
fileout = open ('file.out', 'w')

However, when I enter a filename like "test", it gives the output file as "file.out" instead of "test.out".

Don't use file as variable name.
you wanted a .out extension for the output filename that the user types. therefore you should declare your filename as:

filename = raw_inpu("blah....")
filename = filename + ".out")
fileout = open(filename,"w")
....
 

[bartonc]

Read from an existing file, then output a file with the same name but an extension:

file = raw_input ('Enter the filename:\n')
fileout = open ('file.out', 'w')

However, when I enter a filename like "test", it gives the output file as "file.out" instead of "test.out".

Ok. Here's what you want to do: Open the file that has your input in "r"ead mode. Read the data. Close the input file. Do some work on the data. Open a new file for output in "w"rite mode. write the data. Close the output file. Basically:

inputFileName = raw_input ('Enter the filename:\n')
outputFileName = inputFileName + ".out"
 
inFile = open(inputFileName, 'r')
dataAsList = inFile.readlines()
inFile.close()
 
# simulate some work here
for line in dataAsList:
    print line
 
outFile = open (outputFileName, 'w')
outFile.writelines(dataAsList)
outFile.close()
 

Hope that helps.

[runsun]

That works well. Thank ghostdog74!

Don't use file as variable name.
you wanted a .out extension for the output filename that the user types. therefore you should declare your filename as:

filename = raw_inpu("blah....")
filename = filename + ".out")
fileout = open(filename,"w")
....
 

[runsun]

Thank you very much!
Not only did you answer this extension question, but also answered those related to my previous questions!

Ok. Here's what you want to do: Open the file that has your input in "r"ead mode. Read the data. Close the input file. Do some work on the data. Open a new file for output in "w"rite mode. write the data. Close the output file. Basically:

inputFileName = raw_input ('Enter the filename:\n')
outputFileName = inputFileName + ".out"
 
inFile = open(inputFileName, 'r')
dataAsList = inFile.readlines()
inFile.close()
 
# simulate some work here
for line in dataAsList:
    print line
 
outFile = open (outputFileName, 'w')
outFile.writelines(dataAsList)
outFile.close()
 

Hope that helps.

[bartonc]

Thank you very much!
Not only did you answer this extension question, but also answered those related to my previous questions!

You are welcome, very much.
Thank you for joining TheScripts.com.
Keep posting,
Barton