Drop Python 2.7 support

Upstream IPython dropped it in version 6.0.0, in April 2017. I think it's fine to drop it here now.

Would also be good to use this opportunity to mark the release as 1.0.0.

Author: adamchainz

HISTORY.txt

@@ -4,7 +4,7 @@ Changelog
 0.13.10 (unreleased)
 --------------------
 
-- Nothing changed yet.
+- Drop Python 2.7 compatibility.
 
 
 0.13.9 (2021-06-02)

ipdb/__main__.py

@@ -4,7 +4,6 @@
 # Redistributable under the revised BSD license
 # https://opensource.org/licenses/BSD-3-Clause
 
-from __future__ import print_function
 import os
 import sys
 
@@ -16,10 +15,7 @@
 from IPython.core.debugger import BdbQuit_excepthook
 from IPython.terminal.ipapp import TerminalIPythonApp
 from IPython.terminal.embed import InteractiveShellEmbed
-try:
-    import configparser
-except:
-    import ConfigParser as configparser
+import configparser
 
 
 def _get_debugger_cls():
@@ -93,7 +89,7 @@ def get_context_from_config():
         )
 
 
-class ConfigFile(object):
+class ConfigFile:
     """
     Filehandle wrapper that adds a "[ipdb]" section to the start of a config
     file so that users don't actually have to manually add a [ipdb] section.
@@ -255,11 +251,7 @@ def main():
     import sys
     import getopt
 
-    try:
-        from pdb import Restart
-    except ImportError:
-        class Restart(Exception):
-            pass
+    from pdb import Restart
 
     if sys.version_info >= (3, 7):
         opts, args = getopt.getopt(sys.argv[1:], 'mhc:', ['help', 'command='])

ipdb/stdout.py

@@ -1,4 +1,3 @@
-from __future__ import print_function
 import sys
 from contextlib import contextmanager
 from IPython.utils import io

setup.py

@@ -6,7 +6,6 @@
 
 import io
 import re
-from sys import version_info
 
 from setuptools import find_packages, setup
 
@@ -19,18 +18,11 @@
     '\n\n' + open('HISTORY.txt').read())
 
 
-if version_info[0] == 2:
-    console_script = 'ipdb'
-else:
-    console_script = 'ipdb%d' % version_info.major
-
-
 setup(name='ipdb',
       version=version,
       description="IPython-enabled pdb",
       long_description=long_description,
       classifiers=[
-        'Programming Language :: Python :: 2.7',
         'Programming Language :: Python :: 3',
         'Programming Language :: Python :: 3.4',
         'Programming Language :: Python :: 3.5',
@@ -54,23 +46,19 @@
       include_package_data=True,
       zip_safe=True,
       test_suite='tests',
-      python_requires=">=2.7",
+      python_requires=">=3.4",
       install_requires=[
           'setuptools',
       ],
       extras_require={
-          ':python_version == "2.7"': ['ipython >= 5.1.0, < 6.0.0', 'toml >= 0.10.2', 'decorator < 5.0.0'],
           # No support for python 3.0, 3.1, 3.2.
           # FTR, `decorator` is also a dependency of Ipython.
           ':python_version == "3.4"': ['ipython >= 6.0.0, < 7.0.0', 'toml >= 0.10.2', 'decorator < 5.0.0'],
           ':python_version == "3.5"': ['ipython >= 7.0.0, < 7.10.0', 'toml >= 0.10.2', 'decorator'],
           ':python_version == "3.6"': ['ipython >= 7.10.0, < 7.17.0', 'toml >= 0.10.2', 'decorator'],
           ':python_version > "3.6"': ['ipython >= 7.17.0', 'toml >= 0.10.2', 'decorator'],
       },
-      tests_require=[
-          'mock; python_version<"3"'
-      ],
       entry_points={
-          'console_scripts': ['%s = ipdb.__main__:main' % console_script]
+          'console_scripts': ['ipdb3 = ipdb.__main__:main']
       }
 )

tests/test_config.py

@@ -15,7 +15,7 @@
 from ipdb.__main__ import get_config
 
 
-class ModifiedEnvironment(object):
+class ModifiedEnvironment:
     """
     I am a context manager that sets up environment variables for a test case.
     """

tests/test_opts.py

@@ -5,10 +5,7 @@
 # https://opensource.org/licenses/BSD-3-Clause
 
 import unittest
-try:
-    from unittest.mock import patch
-except ImportError:
-    from mock import patch
+from unittest.mock import patch
 
 from getopt import GetoptError
 from ipdb.__main__ import main