When running the examples in docs/getting_started.md i encountered a Value Error in the Show Progress Section with the progress bar.
Here is the code i runned:

latest_iteration = st.empty()
bar = st.progress(0)

for i in range(101):
  # Update the progress bar with each iteration.
  latest_iteration.text('Iteration %d' % i)
  bar.progress(i + 1)
  time.sleep(0.1)

'...and now we\'re done!'

Here is the error:

ValueError: Progress Value has invalid value [0, 100]: 101
File "/home/kevin/anaconda3/envs/tf2/lib/python3.6/site-packages/streamlit/ScriptRunner.py", line 306, in _run_script exec(code, module.dict)
File "/home/kevin/Bureau/streamtest/first_app.py", line 49, in bar.progress(i + 1)
File "/home/kevin/anaconda3/envs/tf2/lib/python3.6/site-packages/streamlit/DeltaGenerator.py", line 122, in wrapped_method marshall_element, delta_type, last_index)
File "/home/kevin/anaconda3/envs/tf2/lib/python3.6/site-packages/streamlit/DeltaGenerator.py", line 317, in _enqueue_new_element_delta rv = marshall_element(msg.delta.new_element)
File "/home/kevin/anaconda3/envs/tf2/lib/python3.6/site-packages/streamlit/DeltaGenerator.py", line 119, in marshall_element return method(dg, element, *args, **kwargs)
File "/home/kevin/anaconda3/envs/tf2/lib/python3.6/site-packages/streamlit/DeltaGenerator.py", line 1943, in progress "Progress Value has invalid value [0, 100]: %d" % value

Looks like it's because at the last iteration i = 100 . The error is raised by bar.progress(101) . I guess that what we wanted here is a progress bar with 100 iterations and not 101. I fixed the error by changing the value in range() to 100. Will submit a pull request