🔒 IndexError while reading a file via readlines method

[urban reef]

So I wanted to load the saved user data from a different file (User_Data_Categories.md).
https://paste.pythondiscord.com/5BWA Here's the full code

[oblique raptor]

@urban reef

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[urban reef]

elif(UserPrompt.lower() == "load"):
with open("User_Data_Categories.md", "r") as file_to_load:
i = 0
for line in file_to_load:
category = file_to_load.readline()[i]
print(category)
i += 1
categories_list.append(category)
code sample

category = file_to_load.readline()[i]
~~~~~~~~~~~~~~~~~~~~~~~^^^
IndexError: string index out of range

[ocean dove]

i is counting lines, but you're using it to index the line itself

Why iterate the file and also call readline?

[urban reef]

because I want the line number

because user data has been saved on the basis of line number

Like dis -

1. abc
2. def

3. ghi

etc.

[ocean dove]

I don't see why that requires you to call readline.

line is already each line.

[urban reef]

what shall I call then? If I have to find the index of a line with a particular word

[ocean dove]

Like I mentioned, line is already each line. Just use line.

[urban reef]

can u tell me how?

[ocean dove]

Just replace the call to readline with line.

And don't index the line with i, since that's the actual cause of the error.

[urban reef]

category = file_to_load.line()
^^^^^^^^^^^^^^^^^
AttributeError: '_io.TextIOWrapper' object has no attribute 'line'

I am kinda new to python sorry

[ocean dove]

No. Just line. Replace the whole thing with line.

[urban reef]

oh thanks it worked!

[ocean dove]

You're welcome.

[urban reef]

There's another error lol

It is unable to find the category from the category_list

[ocean dove]

What does it show if you print out the category list first?

[urban reef]

Language

            if category_To_Load in categories_list:
                Value_to_load = category_To_Load.index()
                with open("User_Data_Value.md", "r") as file_value_to_load:
                    Value_to_load_Final =  file_value_to_load.readline[Value_to_load]
                    print(f"{category_To_Load}: {Value_to_load_Final}")   ```

The error might be here

[ocean dove]

I think it keeps the newlines at the end of the lines, which won't be present when taking input via input. You can stop the string to remove the new lines.

[urban reef]

how?

[ocean dove]

Strings has a strip method.

[urban reef]

oh okay lemme use it

                    ^^^^^^^^^^^^^^^^^^^^^^^^
TypeError: index() takes at least 1 argument (0 given)```

error

What argument does it take

[ocean dove]

!d str.index

[oblique raptor]

str.index

str.index(sub[, start[, end]])```
Like [`find()`](https://docs.python.org/3/library/stdtypes.html#str.find), but raise [`ValueError`](https://docs.python.org/3/library/exceptions.html#ValueError) when the substring is not found.

[ocean dove]

Why are you calling index?

[urban reef]

to know the index of the category to access it's value from a different file through readlines[index].

Oh now I know what's the mistake

Value_to_load = categories_list.index(category_To_Load)

This is how it had to be written ig.

[ocean dove]

Yep, there you go.

[urban reef]

Thank u so much, it worked 🙂

[ocean dove]

You're welcome.

[oblique raptor]

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