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# These variables are used at the end of the module to decide
# which BaseFitter subclass the Fitter will point to.
import warnings
from .basefitter import BaseFitter
has_ipython, has_matplotlib = False, False
try:
import matplotlib
except ImportError:
pass
else:
has_matplotlib = True
try:
import IPython
except ImportError:
warnings.warn("lmfit.Fitter will use basic mode, not IPython: need matplotlib")
else:
_ipy_msg1 = "lmfit.Fitter will use basic mode, not IPython: need IPython2."
_ipy_msg2 = "lmfit.Fitter will use basic mode, not IPython: could not get IPython version"
_ipy_msg3 = "lmfit.Fitter will use basic mode, not IPython: need ipywidgets."
try:
major_version = IPython.release.version_info[0]
if major_version < 2:
warnings.warn(_ipy_msg1)
elif major_version > 3:
# After IPython 3, widgets were moved to a separate package.
# There is a shim to allow the old import, but the package has to be
# installed for that to work.
try:
import ipywidgets
except ImportError:
warnings.warn(_ipy_msg3)
else:
# has_ipython = iPython installed and we are in an IPython session.
has_ipython = IPython.get_ipython() is not None
except Exception as e:
warnings.warn(_ipy_msg2)
Fitter = BaseFitter
if has_matplotlib:
from .basefitter import MPLFitter
Fitter = MPLFitter
if has_ipython:
from .ipy_fitter import NotebookFitter
Fitter = NotebookFitter
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