code: def plotting_demo():
      progress_bar = st.sidebar.progress(0)
      status_text = st.sidebar.empty()
      last_rows = np.random.randn(1, 1)
      chart = st.line_chart(last_rows)
  
      for i in range(1, 101):
          new_rows = last_rows[-1, :] + np.random.randn(5, 1).cumsum(
              axis=0
          )
          status_text.text("%i%% Complete" % i)
          chart.add_rows(new_rows)
          progress_bar.progress(i)
          last_rows = new_rows
          time.sleep(0.05)
  
      progress_bar.empty()
  
      # Streamlit widgets automatically run the script from top to bottom. Since
      # this button is not connected to any other logic, it just causes a plain
      # rerun.
      st.button("Re-run")
  
imports: import time
  import numpy
  import streamlit
  from streamlit.hello.utils import show_code
label_desc: Use image node_id 1 for calling a global function with example usage: plotting_demo() without return types