w2sv/koala

A poor man's version of a pandas DataFrame for dart.

koala's Issues

Working with rows

I can't iterate through rows using koala, is there any method that I don't know off? row[idx] only gives List<Object?>

I suggest implementing a row index to map of column name to value method, and using this method to iterate through the dataframe. Unless I am missing something, and there is a better way.

I can make a PR, but I think you'd probably make a better design decision than I will. I can review nonetheless!

FromCSV bytes support

From CSV FilePicker readStream not working anymore

I have the following that used to work:

FilePickerResult? result = await FilePicker.platform.pickFiles(
    dialogTitle: "Pick CSV files with data",
    allowedExtensions: ['csv'],
    type: FileType.custom,
    allowMultiple: true,
    withReadStream: true);

if (result != null) {
  for (PlatformFile file in result.files) {
    String fileStem = file.name.replaceAll('.csv', '');
    String augmentedFileStem = fileStem.toLowerCase().replaceAll('_', ' ');

    filenameToCsvDataframe.value[fileStem] = await DataFrame.fromCsv(rowStream: file.readStream);

Now it doesn't, the stream is empty without populating the df:

Error: Invalid argument(s): Did not receive any data; Use DataFrame.empty() to create an empty DataFrame

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Detected dependencies

github-actions

.github/workflows/build.yaml

• actions/checkout v4
• dart-lang/setup-dart v1.4

pub

pubspec.yaml

• collection ^1.16.0
• csv ^6.0.0
• jiffy ^6.0.0
• coverage ^1.7.2
• test ^1.25.2
• dart >=2.13.0 <4.0.0

---

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Rename repository & package to 'koalas'

The repository & package should be renamed to 'koalas', in order for it to align with the inflection of the package name 'pandas', which the name alludes to and is modeled after.

• Pros:
  • this OBVIOUS shortcoming would finally stop profoundly bothering me
• Cons:
  • would require all applications using this package to migrate

Hmm.