Motivation

Streamlit is a powerful tools to quickliy build the demo application. If we use Streamlit file upload feature via WebBrowser then we need to its file path to process the uploaded file. So I will introduce how to get uploaed file path in Streamlit.

Example

We buid the PDF File upload feature in Streamlit and its PDF file convert to image. We use Belval/pdf2image which is a populer PDF converting tool. It needs to file path to apply the module feature. we assume local machine is the MacOS then we need to install the poppler to use pdf2image,

Demo app screenshot and open sourced code

get the uploaded file path in Streamlit

We also publised a code example at hurutoriya/streamlist-file-uploader-example

Demo Movie in Youtube

Makefile

It worked task runner to install the dependency and run the app.

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install:
	brew install poppler
	poetry install
run:
	poetry run streamlit run streamlit_pdf_uploader/main.py

Poetry for package management

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[tool.poetry]
name = "streamlit-pdf-uploader"
version = "0.1.0"
description = ""
authors = [""]

[tool.poetry.dependencies]
python = "^3.8"
streamlit = "^0.84.0"
watchdog = "^2.1.3"
pdf2image = "^1.16.0"

[tool.poetry.dev-dependencies]
pytest = "^5.2"

[build-system]
requires = ["poetry-core>=1.0.0"]
build-backend = "poetry.core.masonry.api"

Streamlit Python file

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import base64
import tempfile

import streamlit as st
from pdf2image import convert_from_path

from pathlib import Path

def show_pdf(file_path:str):
    """Show the PDF in Streamlit
    That returns as html component

    Parameters
    ----------
    file_path : [str]
        Uploaded PDF file path
    """

    with open(file_path, "rb") as f:
        base64_pdf = base64.b64encode(f.read()).decode("utf-8")
    pdf_display = f'<embed src="data:application/pdf;base64,{base64_pdf}" width="100%" height="1000" type="application/pdf">'
    st.markdown(pdf_display, unsafe_allow_html=True)


def main():
    """Streamlit application
    """

    st.title("PDF file uplodaer")
    uploaded_file = st.file_uploader("Choose your .pdf file", type="pdf")

    if uploaded_file is not None:
        # Make temp file path from uploaded file
        with tempfile.NamedTemporaryFile(delete=False) as tmp_file:
            st.markdown("## Original PDF file")
            fp = Path(tmp_file.name)
            fp.write_bytes(uploaded_file.getvalue())
            st.write(show_pdf(tmp_file.name))

            imgs = convert_from_path(tmp_file.name)

            st.markdown(f"Converted images from PDF")
            st.image(imgs)


if __name__ == "__main__":
    main()

Conclusion

Streamlit is a powerful tools to quickliy build the demo application. You leand about how to get the uploade file path from Streamlit in this post.

Reference

See Also

Support

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