improve API, Python >= 3.5 compatible

HornSchunck.py

@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# -*- coding: future_fstrings -*-
 """
 ./HornSchunck.py data/box/box
 ./HornSchunck.py data/office/office
@@ -16,7 +17,8 @@
 FILTER = 7
 
 def demo(stem):
-    flist,ext = getimgfiles(stem)
+    flist = getimgfiles(stem)
+    ext = flist[0].suffix
 
     for i in range(len(flist)-1):
         fn1 = f'{stem}.{i}{ext}'

LucasKanade.py

@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# -*- coding: future_fstrings -*-
 """
 ./LucasKanade.py data/box/box
 ./LucasKanade.py data/office/office
@@ -13,7 +14,8 @@
 from pyoptflow.plots import compareGraphsLK
 
 def demo(stem, kernel=5,Nfilter=7):
-    flist,ext = getimgfiles(stem)
+    flist = getimgfiles(stem)
+    ext = flist[0].suffix
 #%% priming read
     im1 = imread(f'{stem}.0{ext}', flatten=True)
     Y,X = im1.shape

pyoptflow/io.py

@@ -1,3 +1,4 @@
+# -*- coding: future_fstrings -*-
 from pathlib import Path
 
 def getimgfiles(stem):
@@ -7,7 +8,7 @@ def getimgfiles(stem):
     exts = ['.ppm','.bmp','.png','.jpg']
     for ext in exts:
         pat = f'{name}.*{ext}'
-        print(f'searching {path}/{pat}')
+        print(f'searching {path/pat}')
         flist = sorted(path.glob(pat))
         if flist:
             break
@@ -17,4 +18,4 @@ def getimgfiles(stem):
 
     print(f'analyzing {len(flist)} files {stem}.*{ext}')
 
-    return flist,ext
+    return flist

setup.py

@@ -1,27 +1,29 @@
 #!/usr/bin/env python
 req = ['nose','setuptools','pillow','scipy','numpy']
+pipreq = ['future-fstrings']
 ereq = ['matplotlib']
 # %%
+import pip
 try:
     import conda.cli
     conda.cli.main('install',*req)
 except Exception:
-    import pip
     pip.main(['install'] + req)
+pip.main(['install'] + pipreq)
 # %%
 from setuptools import setup
 
 setup(name='pyoptflow',
       packages=['pyoptflow'],
       author='Michael Hirsch, Ph.D.',
       url='https://github.com/scivision/pyoptflow',
-      version='1.0.0',
+      version='1.1.0',
       classifiers=[
       'Topic :: Scientific/Engineering',
       'Development Status :: 3 - Alpha',
       'Programming Language :: Python :: 3',
       ],
-      install_requires=req,
+      install_requires = req + pipreq,
       extras_require={'plot':ereq},
       description='Pure Python optical flow: Horn-Schunck, Lucas-Kanade',
 	  )

tests/test.py

@@ -31,8 +31,8 @@ def test_lucaskanade():
     print(V)
 
 def test_io():
-    im1 = pio.getimgfiles(RDIR/'data/box/box')
-    print()
+    flist = pio.getimgfiles(RDIR/'data/box/box')
+    print(flist)