Drop support for Python 3.5

8 files changed, 9 insertions, 19 deletions

diff --git a/.appveyor.yml b/.appveyor.yml
index 0c2987a3..b2bee12c 100644
--- a/.appveyor.yml
+++ b/.appveyor.yml
@@ -11,16 +11,12 @@ environment:
     CACHE_DIR: "%LOCALAPPDATA%\\pip\\Cache"
 
   matrix:
-    - PYTHON: "C:\\Python35-x64"
-      PYTHON_VERSION: "3.5.3"
-      PYTHON_ARCH: "64"
-
     - PYTHON: "C:\\Python36-x64"
-      PYTHON_VERSION: "3.6.6"
+      PYTHON_VERSION: "3.6.8"
       PYTHON_ARCH: "64"
 
     - PYTHON: "C:\\Python37-x64"
-      PYTHON_VERSION: "3.7.0"
+      PYTHON_VERSION: "3.7.5"
       PYTHON_ARCH: "64"
 
     - PYTHON: "C:\\Python38-x64"
diff --git a/.travis.yml b/.travis.yml
index 86897448..0a550f47 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -63,7 +63,6 @@ matrix:
       osx_image: xcode11
       language: generic
       env: TRAVIS_PYTHON_VERSION=3.8
-    - python: 3.5
     - python: 3.6
     - python: 3.8
     - python: pypy3.6-7.1.1
diff --git a/INSTALL.rst b/INSTALL.rst
index df6b5110..b6ddff97 100644
--- a/INSTALL.rst
+++ b/INSTALL.rst
@@ -1,7 +1,7 @@
 Install
 =======
 
-NetworkX requires Python 3.5, 3.6, 3.7, or 3.8.  If you do not already
+NetworkX requires Python 3.6, 3.7, or 3.8.  If you do not already
 have a Python environment configured on your computer, please see the
 instructions for installing the full `scientific Python stack
 <https://scipy.org/install.html>`_.
diff --git a/doc/release/release_dev.rst b/doc/release/release_dev.rst
index d654a4df..5fa1de57 100644
--- a/doc/release/release_dev.rst
+++ b/doc/release/release_dev.rst
@@ -17,6 +17,7 @@ Highlights
 This release is the result of 6 months of work with over X pull requests by
 X contributors. Highlights include:
 
+- Dropped support for Python 3.5.
 
 Improvements
 ------------
diff --git a/examples/advanced/plot_parallel_betweenness.py b/examples/advanced/plot_parallel_betweenness.py
index 897656f4..ae098477 100644
--- a/examples/advanced/plot_parallel_betweenness.py
+++ b/examples/advanced/plot_parallel_betweenness.py
@@ -10,11 +10,6 @@ The function betweenness centrality accepts a bunch of nodes and computes
 the contribution of those nodes to the betweenness centrality of the whole
 network. Here we divide the network in chunks of nodes and we compute their
 contribution to the betweenness centrality of the whole network.
-
-This doesn't work in python2.7.13. It does work in 3.6, 3.5, 3.4, and 3.3.
-
-It may be related to this:
-https://stackoverflow.com/questions/1816958/cant-pickle-type-instancemethod-when-using-multiprocessing-pool-map
 """
 
 from multiprocessing import Pool
diff --git a/networkx/__init__.py b/networkx/__init__.py
index 61f88774..61a1a4e2 100644
--- a/networkx/__init__.py
+++ b/networkx/__init__.py
@@ -63,8 +63,8 @@ Released under the 3-Clause BSD license::
 #
 
 import sys
-if sys.version_info[:2] < (3, 5):
-    m = "Python 3.5 or later is required for NetworkX (%d.%d detected)."
+if sys.version_info[:2] < (3, 6):
+    m = "Python 3.6 or later is required for NetworkX (%d.%d detected)."
     raise ImportError(m % sys.version_info[:2])
 del sys
 
diff --git a/networkx/release.py b/networkx/release.py
index 309e8ae8..c047ca78 100644
--- a/networkx/release.py
+++ b/networkx/release.py
@@ -206,7 +206,6 @@ classifiers = [
     'License :: OSI Approved :: BSD License',
     'Operating System :: OS Independent',
     'Programming Language :: Python :: 3',
-    'Programming Language :: Python :: 3.5',
     'Programming Language :: Python :: 3.6',
     'Programming Language :: Python :: 3.7',
     'Programming Language :: Python :: 3.8',
diff --git a/setup.py b/setup.py
index 03bfd53a..0aa27d05 100644
--- a/setup.py
+++ b/setup.py
@@ -19,8 +19,8 @@ if sys.argv[-1] == 'setup.py':
     print("To install, run 'python setup.py install'")
     print()
 
-if sys.version_info[:2] < (3, 5):
-    error = """NetworkX 2.3+ requires Python 3.5 or later (%d.%d detected).
+if sys.version_info[:2] < (3, 6):
+    error = """NetworkX 2.5+ requires Python 3.6 or later (%d.%d detected).
              
 For Python 2.7, please install version 2.2 using:
 
@@ -162,6 +162,6 @@ if __name__ == "__main__":
         package_data=package_data,
         install_requires=install_requires,
         extras_require=extras_require,
-        python_requires='>=3.5',
+        python_requires='>=3.6',
         zip_safe=False
     )