don't use pandas for numpy > 1.23 where loadtxt fast anyway

Author: cmbant

docs/source/gui.rst

@@ -51,7 +51,7 @@ To run the GUI you need PySide. This is not included in default dependencies, bu
 
 You can also use PySide2, e.g. using `Anaconda <https://www.anaconda.com/distribution/>`_ to make a consistent new environment from conda-forge (which includes PySide2)  e.g. ::
 
-  conda create -n py39forge -c conda-forge python=3.9 scipy pandas matplotlib PyYAML PySide2
+  conda create -n py39forge -c conda-forge python=3.9 scipy matplotlib PyYAML PySide2
 
 Once PySide is set up, (re)install getdist and you should then be able to use the getdist-gui script on your path.
 On a Mac the installation will also make a GetDist GUI Mac app, which you can find using Spotlight.

getdist/chains.py

@@ -1,6 +1,7 @@
 import os
 import numpy as np
 import re
+from packaging import version
 from getdist.paramnames import ParamNames, ParamInfo, escapeLatex
 from getdist.convolve import autoConvolve
 from getdist import cobaya_interface
@@ -16,11 +17,6 @@
 _int_types = (int, np.integer)
 ParamConfidenceData = namedtuple("ParamConfidenceData", ("paramVec", "norm", "indexes", "cumsum"))
 
-try:
-    import pandas
-except ImportError:
-    pandas = None
-
 
 class WeightedSampleError(Exception):
     """
@@ -113,28 +109,28 @@ def hasChainFiles(file_root, ext='.txt'):
     return any(chainFiles(file_root, ext=ext, separator=sep, last_chain=1) for sep in ['_', '.'])
 
 
-_pandas_suggestion = True
-
-
 def loadNumpyTxt(fname, skiprows=None):
     """
     Utility routine to loads numpy array from file.
-    Uses faster pandas read routine if pandas is installed, or falls back to numpy's loadtxt otherwise
 
     :param fname: The file to load
     :param skiprows: The number of rows to skip at the begging of the file
     :return: numpy array of the data values
     """
+
+    if not hasattr(loadNumpyTxt, 'pandas'):
+        loadNumpyTxt.pandas = None
+        try:
+            if version.parse(np.__version__) < version.parse('1.23'):
+                import pandas
+                loadNumpyTxt.pandas = pandas
+        except ImportError:
+            logging.warning('Install pandas or numpy 1.23+ for faster reading from text files')
     try:
-        if pandas:
-            return pandas.read_csv(fname, delim_whitespace=True, header=None, dtype=np.float64,
-                                   skiprows=skiprows, comment='#').values
-        else:
-            global _pandas_suggestion
-            if _pandas_suggestion:
-                _pandas_suggestion = False
-                logging.warning('Install pandas for faster reading from text files')
-            return np.atleast_2d(np.loadtxt(fname, skiprows=skiprows or 0))
+        if loadNumpyTxt.pandas:
+            return loadNumpyTxt.pandas.read_csv(fname, delim_whitespace=True, header=None, dtype=np.float64,
+                                                skiprows=skiprows, comment='#').values
+        return np.atleast_2d(np.loadtxt(fname, skiprows=skiprows or 0))
     except ValueError:
         print('Error reading %s' % fname)
         raise

getdist/gui/mainwindow.py

@@ -38,7 +38,7 @@
     if not os.path.exists(os.path.join(sys.prefix, 'conda-meta')):
         print('Using Anaconda is probably the most reliable method')
     print("E.g. make and use a new environment")
-    print('conda create -n py10side python=3.10 scipy pandas matplotlib')
+    print('conda create -n py10side python=3.10 scipy matplotlib')
     print("then 'pip install PySide6'")
 
     sys.exit(-1)

getdist/tests/getdist_test.py

@@ -14,7 +14,6 @@
 import matplotlib.pyplot as plt
 
 
-
 class GetDistFileTest(unittest.TestCase):
     """test reading files, convergence routines and getdist script"""
 

setup.py

@@ -140,8 +140,7 @@ def run(self):
           'scipy (>=1.5.0)',
           'PyYAML (>=5.1)'],
       # PySide is needed for the GUI
-      # pandas optional (for faster txt chain file read)
-      extras_require={'GUI': ["PySide6>=6.10"], 'txt': ["pandas>=1.0"]},
+      extras_require={'GUI': ["PySide6>=6.10"]},
       cmdclass=cmd_class,
       classifiers=[
           'Development Status :: 5 - Production/Stable',
@@ -152,7 +151,8 @@ def run(self):
           'Programming Language :: Python :: 3.7',
           'Programming Language :: Python :: 3.8',
           'Programming Language :: Python :: 3.9',
-          'Programming Language :: Python :: 3.10'
+          'Programming Language :: Python :: 3.10',
+          'Programming Language :: Python :: 3.11'
       ],
       python_requires='>=3.6',
       keywords=['MCMC', 'KDE', 'sample', 'density estimation', 'plot', 'figure']