Display a file uploader widget.
Function signature

st.file_uploader(label: str, type: Union[str, List[str], NoneType] = None, accept_multiple_files: bool = False, key: Union[str, int, NoneType] = None, help: Optional[str] = None, on_change: Optional[Callable[..., NoneType]] = None, args: Optional[Tuple[Any, ...]] = None, kwargs: Optional[Dict[str, Any]] = None) -> Union[streamlit.uploaded_file_manager.UploadedFile, List[streamlit.uploaded_file_manager.UploadedFile], NoneType]

Parameters

label (str)

A short label explaining to the user what this file uploader is for.

type (str or list of str or None)

Array of allowed extensions. ['png', 'jpg'] The default is None, which means all extensions are allowed.

accept_multiple_files (bool)

If True, allows the user to upload multiple files at the same time, in which case the return value will be a list of files. Default: False

key (str or int)

An optional string or integer to use as the unique key for the widget. If this is omitted, a key will be generated for the widget based on its content. Multiple widgets of the same type may not share the same key.

help (str)

A tooltip that gets displayed next to the file uploader.

on_change (callable)

An optional callback invoked when this file_uploader's value changes.

args (tuple)

An optional tuple of args to pass to the callback.

kwargs (dict)

An optional dict of kwargs to pass to the callback.

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