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    Python crashes when I try the sample code.

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    • H
      Humbleguy last edited by

      Hi,
      I just started with backtrader. Naturally, I coded the sample program given in the git main page ( https://github.com/mementum/backtrader ). I installed the latest version of the backtrader with pip, and I do have matplotlib (1.5.1). But when I run the code, python crashes at cerebro.plot() line in the sample code.

      I appreciate any help. Thanks.
      More info:
      I use Python 3.5.1 :: Anaconda 4.0.0 (64-bit)
      pip list output:

      alabaster (0.7.7)
      anaconda-client (1.4.0)
      anaconda-navigator (1.1.1)
      argcomplete (1.0.0)
      astropy (1.1.2)
      Babel (2.2.0)
      backtrader (1.9.47.116)
      beautifulsoup4 (4.4.1)
      bitarray (0.8.1)
      blaze (0.9.1)
      bokeh (0.11.1)
      boto (2.39.0)
      Bottleneck (1.0.0)
      cffi (1.5.2)
      chest (0.2.3)
      cloudpickle (0.1.1)
      clyent (1.2.1)
      colorama (0.3.7)
      comtypes (1.1.2)
      conda (4.0.7)
      conda-build (1.20.0)
      conda-env (2.4.5)
      conda-manager (0.4.0)
      configobj (5.0.6)
      cryptography (1.3)
      cycler (0.10.0)
      Cython (0.23.4)
      cytoolz (0.7.5)
      dask (0.8.1)
      datashape (0.5.1)
      decorator (4.0.9)
      dill (0.2.4)
      docutils (0.12)
      dynd (c328ab7)
      et-xmlfile (1.0.1)
      fastcache (1.0.2)
      Flask (0.10.1)
      Flask-Cors (2.1.2)
      gevent (1.1.0)
      greenlet (0.4.9)
      h5py (2.5.0)
      HeapDict (1.0.0)
      html5lib (0.999)
      ibapi (9.73.2, c:\tws api\source\pythonclient)
      idna (2.0)
      ipykernel (4.3.1)
      ipython (4.1.2)
      ipython-genutils (0.1.0)
      ipywidgets (4.1.1)
      itsdangerous (0.24)
      jdcal (1.2)
      jedi (0.9.0)
      Jinja2 (2.8)
      jsonschema (2.4.0)
      jupyter (1.0.0)
      jupyter-client (4.2.2)
      jupyter-console (4.1.1)
      jupyter-core (4.1.0)
      llvmlite (0.9.0)
      locket (0.2.0)
      lxml (3.6.0)
      MarkupSafe (0.23)
      matplotlib (1.5.1)
      menuinst (1.3.2)
      mistune (0.7.2)
      mpmath (0.19)
      multipledispatch (0.4.8)
      nbconvert (4.1.0)
      nbformat (4.0.1)
      networkx (1.11)
      nltk (3.2)
      nose (1.3.7)
      notebook (4.1.0)
      numba (0.24.0)
      numexpr (2.5)
      numpy (1.12.1)
      odo (0.4.2)
      openpyxl (2.3.2)
      pandas (0.19.2)
      pandas-datareader (0.3.0.post0)
      partd (0.3.2)
      path.py (0.0.0)
      patsy (0.4.0)
      pep8 (1.7.0)
      pickleshare (0.5)
      Pillow (3.1.1)
      pip (9.0.1)
      ply (3.8)
      psutil (4.1.0)
      py (1.4.31)
      pyasn1 (0.1.9)
      pycosat (0.6.1)
      pycparser (2.14)
      pycrypto (2.6.1)
      pyflakes (1.1.0)
      Pygments (2.1.1)
      pyOpenSSL (0.15.1)
      pyparsing (2.0.3)
      pyreadline (2.1)
      pytest (2.8.5)
      python-dateutil (2.6.0)
      pytz (2017.2)
      pywin32 (220)
      PyYAML (3.11)
      pyzmq (15.2.0)
      QtAwesome (0.3.2)
      qtconsole (4.2.0)
      QtPy (1.0)
      requests (2.14.1)
      requests-file (1.4.2)
      requests-ftp (0.3.1)
      rope-py3k (0.9.4.post1)
      scikit-image (0.12.3)
      scikit-learn (0.17.1)
      scipy (0.17.0)
      setuptools (20.3)
      simplegeneric (0.8.1)
      singledispatch (3.4.0.3)
      six (1.10.0)
      snowballstemmer (1.2.1)
      sockjs-tornado (1.0.1)
      Sphinx (1.3.1)
      sphinx-rtd-theme (0.1.9)
      spyder (2.3.8)
      SQLAlchemy (1.0.12)
      statsmodels (0.6.1)
      sympy (1.0)
      tables (3.2.2)
      toolz (0.7.4)
      tornado (4.3)
      traitlets (4.2.1)
      unicodecsv (0.14.1)
      Werkzeug (0.11.4)
      wheel (0.29.0)
      xlrd (0.9.4)
      XlsxWriter (0.8.4)
      xlwings (0.7.0)
      xlwt (1.0.0)

      1 Reply Last reply Reply Quote 0
      • H
        Humbleguy last edited by

        Solved.

        I just needed to upgrade matplotlib.

        sorry for the bother..

        1 Reply Last reply Reply Quote 0
        • B
          backtrader administrators last edited by

          Seems odd anyhow, because the above list shows matplotlib with version 1.5.1. It may have been that such version broke some behavior (not only in backtrader) and was later corrected.

          1 Reply Last reply Reply Quote 0
          • H
            Humbleguy last edited by

            Thank you very much for the reply.
            I downgraded maplotlib to 1.4.1 as it is the suggested min version in the git main page. It did not help either. Only after I upgraded matplotlib to latest, it worked.
            I was thinking the suggested matplotlib version in the main page of git should be updated.
            Thanks.

            1 Reply Last reply Reply Quote 0
            • B
              backtrader administrators last edited by

              The code is usually run against an old 1.5.0rc3. The situation that arises with a downgrade is that many other packages should also be downgraded to achieve the actual status that version had at that time. This was seen with pyfolio, which has changed the API. Version 0.5.1 had a compatible API, but that version had also expectations about the surrounding ecosystem ... hence the problem of downgrading.

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