Replace words in list that later will be used in variable

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I have a file which currently stores a string eeb39d3e-dd4f-11e8-acf7-a6389e8e7978 which I am trying to pass into as a variable to my subprocess command.

My current code looks like this

with open(logfilnavn, 'r') as t:
                test = t.readlines()

But this prints ['eeb39d3e-dd4f-11e8-acf7-a6389e8e7978\n'] and I don't want the part with ['\n'] to be passed into my command, so i'm trying to remove them by using replace.

 with open(logfilnavn, 'r') as t:
            test = t.readlines()
            removestrings = test.replace('[', '').replace('[', '').replace('\\', '').replace("'", '').replace('n', '')

I get an exception value saying this so how can I replace these with nothing and store them as a string for my subprocess command?

'list' object has no attribute 'replace'

so how can I replace these with nothing and store them as a string for my subprocess command?

You get the error because readlines returns a list object. Since you mentioned in the comment that there is just one line in the file, its better to use readline() instead,

line = "" # so you can use it as a variable outside `with` scope,
with open("logfilnavn", 'r') as t:
    line = t.readline()

# output,

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readline() returns a list. Try print(test[0].strip())

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You can read the whole file and split lines using str.splitlines:

test =

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Your test variable is a list, because readlines() returns a list of all lines read.

Since you said the file only contains this one line, you probably wish to perform the replace on only the first line that you read:

removestrings = test[0].replace('[', '').replace('[', '').replace('\\', '').replace("'", '').replace('n', '')

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Where you went wrong...

file.readlines() in python returns an array (collection or grouping of the same variable type) of the lines in the file -- arrays in python are called lists. you, here are treating the list as a string. you must first target the string inside it, then apply that string-only function.

In this case however, this would not work as you are trying to change the way the python interpretter has displayed it for one to understand.

Further information...

In code it would not be a string - we just can't easily understand the stack, heap and memory addresses easily. The example below would work for any number of lines (but it will only print the first element) you will need to change that and

this may be useful...

you could perhaps make the variables globally available (so that other parts of the program can read them

more useless stuff

before they go out of scope - the word used to mean the points at which the interpreter (what runs the program) believes the variable is useful - so that it can remove it from memory, or in much larger programs only worry about the locality of variables e.g. when using for loops i is used a lot without scope there would need to be a different name for each variable in the whole project. scopes however get specialised (meaning that if a scope contains the re-declaration of a variable this would fail as it is already seen as being one. an easy way to understand this might be to think of them being branches and the connections between the tips of branches. they don't touch along with their variables.

with open(logfilenavn, 'r') as file:
  lines = file.readlines() # creates a list
  # an in-line for loop that goes through each item and takes off the last character: \n - the newline character
  #this will work with any number of lines
  strippedLines = [line[:-1] for line in lines]
  strippedLines = [line.replace('\n', '') for line in lines]
  #you can now print the string stored within the list
  print(strippedLines[0]) # this prints the first element in the list

I hope this helped!

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  • readlines will return a list of lines, its not actually a string. You can't use replace with a list.
  • @SufiyanGhori Using this code test = t.readlines().rstrip() i'm getting exception value 'list' object has no attribute 'rstrip'
  • Yeah that's what i've also begun realizing @MuhammadAhmad, but I really don't know what else to do. I've been trying for 3+ hours now.
  • @SufiyanGhori Yeah that prints it without these values, but I still can't pass it into my command as a variable since it's a NoneType
  • @LesnieSncheider The question is: will there only be one line in the file, or there can be more? If there'll only be one line, you don't really need readlines then.
  • thats ok @LesnieSncheider
  • Your code succesfully removes the characters but it doesn't work in my command still. I tried to do subprocess.Popen(['echo', removestrings], universal_newlines=True, stdout=subprocess.PIPE, stderr=subprocess.STDOUT) for line in status.stdout: sys.stdout.write(line) to see what its output was and i'm getting an exception value saying [WinError 2] The system cannot find the file specified
  • This answer is over complexed given the solution is pretty straight forward.
  • Well it sounds to me as if... the system can't find your file :| Any other information you might provide on the matter?
  • @SufiyanGhori It's literally just his own code with three characters ([, 0 and ]) added.
  • agree, but you can tell OP that all the work he is doing can be simplified. OP probably didn't know readlines() returns a list object.