code: def test_mixed_number_input():
      df = pd.DataFrame(dict(a=[1, 2], b=[1.1, 2.1]))
      fig = px.line(df)
      assert len(fig.data) == 2
  
imports: import plotly.express
  import plotly.graph_objects
  import pandas
  import numpy
  from plotly.express._core import build_dataframe, _is_col_list
  from pandas.testing import assert_frame_equal
  import pytest
  import warnings
label_desc: Use image node_id 11 for calling a global function with example usage: test_mixed_number_input() without return types