Drop Python 3.6 support

.travis.yml

@@ -45,7 +45,7 @@ matrix:
         - JOB="3.7, arm64" PYTEST_WORKERS=8 ENV_FILE="ci/deps/travis-37-arm64.yaml" PATTERN="(not slow and not network and not clipboard)"
 
     - env:
-        - JOB="3.6, locale" ENV_FILE="ci/deps/travis-36-locale.yaml" PATTERN="((not slow and not network and not clipboard) or (single and db))" LOCALE_OVERRIDE="zh_CN.UTF-8" SQL="1"
+        - JOB="3.7, locale" ENV_FILE="ci/deps/travis-37-locale.yaml" PATTERN="((not slow and not network and not clipboard) or (single and db))" LOCALE_OVERRIDE="zh_CN.UTF-8" SQL="1"
       services:
         - mysql
         - postgresql
@@ -54,7 +54,7 @@ matrix:
         # Enabling Deprecations when running tests
         # PANDAS_TESTING_MODE="deprecate" causes DeprecationWarning messages to be displayed in the logs
         # See pandas/_testing.py for more details.
-        - JOB="3.6, coverage" ENV_FILE="ci/deps/travis-36-cov.yaml" PATTERN="((not slow and not network and not clipboard) or (single and db))" PANDAS_TESTING_MODE="deprecate" COVERAGE=true SQL="1"
+        - JOB="3.7, coverage" ENV_FILE="ci/deps/travis-37-cov.yaml" PATTERN="((not slow and not network and not clipboard) or (single and db))" COVERAGE=true SQL="1"
       services:
         - mysql
         - postgresql

asv_bench/benchmarks/package.py

@@ -4,22 +4,16 @@
 import subprocess
 import sys
 
-from pandas.compat import PY37
-
 
 class TimeImport:
     def time_import(self):
-        if PY37:
-            # on py37+ we the "-X importtime" usage gives us a more precise
-            #  measurement of the import time we actually care about,
-            #  without the subprocess or interpreter overhead
-            cmd = [sys.executable, "-X", "importtime", "-c", "import pandas as pd"]
-            p = subprocess.run(cmd, stderr=subprocess.PIPE)
-
-            line = p.stderr.splitlines()[-1]
-            field = line.split(b"|")[-2].strip()
-            total = int(field)  # microseconds
-            return total
+        # on py37+ we the "-X importtime" usage gives us a more precise
+        #  measurement of the import time we actually care about,
+        #  without the subprocess or interpreter overhead
+        cmd = [sys.executable, "-X", "importtime", "-c", "import pandas as pd"]
+        p = subprocess.run(cmd, stderr=subprocess.PIPE)
 
-        cmd = [sys.executable, "-c", "import pandas as pd"]
-        subprocess.run(cmd, stderr=subprocess.PIPE)
+        line = p.stderr.splitlines()[-1]
+        field = line.split(b"|")[-2].strip()
+        total = int(field)  # microseconds
+        return total

ci/azure/posix.yml

@@ -9,40 +9,17 @@ jobs:
   strategy:
     matrix:
       ${{ if eq(parameters.name, 'macOS') }}:
-        py36_macos:
-          ENV_FILE: ci/deps/azure-macos-36.yaml
-          CONDA_PY: "36"
+        py37_macos:
+          ENV_FILE: ci/deps/azure-macos-37.yaml
+          CONDA_PY: "37"
           PATTERN: "not slow and not network"
 
       ${{ if eq(parameters.name, 'Linux') }}:
-        py36_minimum_versions:
-          ENV_FILE: ci/deps/azure-36-minimum_versions.yaml
-          CONDA_PY: "36"
+        py37_minimum_versions:
+          ENV_FILE: ci/deps/azure-37-minimum_versions.yaml
+          CONDA_PY: "37"
           PATTERN: "not slow and not network and not clipboard"
 
-        py36_locale_slow_old_np:
-          ENV_FILE: ci/deps/azure-36-locale_slow.yaml
-          CONDA_PY: "36"
-          PATTERN: "slow"
-          # pandas does not use the language (zh_CN), but should support different encodings (utf8)
-          # we should test with encodings different than utf8, but doesn't seem like Ubuntu supports any
-          LANG: "zh_CN.utf8"
-          LC_ALL: "zh_CN.utf8"
-          EXTRA_APT: "language-pack-zh-hans"
-
-        py36_slow:
-          ENV_FILE: ci/deps/azure-36-slow.yaml
-          CONDA_PY: "36"
-          PATTERN: "slow"
-
-        py36_locale:
-          ENV_FILE: ci/deps/azure-36-locale.yaml
-          CONDA_PY: "36"
-          PATTERN: "not slow and not network"
-          LANG: "it_IT.utf8"
-          LC_ALL: "it_IT.utf8"
-          EXTRA_APT: "language-pack-it xsel"
-
         #py36_32bit:
         #  ENV_FILE: ci/deps/azure-36-32bit.yaml
         #  CONDA_PY: "36"

ci/azure/windows.yml

@@ -8,16 +8,16 @@ jobs:
     vmImage: ${{ parameters.vmImage }}
   strategy:
     matrix:
-      py36_np15:
-        ENV_FILE: ci/deps/azure-windows-36.yaml
-        CONDA_PY: "36"
-        PATTERN: "not slow and not network"
-
-      py37_np18:
+      py37_np16:
         ENV_FILE: ci/deps/azure-windows-37.yaml
         CONDA_PY: "37"
         PATTERN: "not slow and not network"
 
+      py38_np18:
+        ENV_FILE: ci/deps/azure-windows-38.yaml
+        CONDA_PY: "38"
+        PATTERN: "not slow and not network"
+
   steps:
     - powershell: |
         Write-Host "##vso[task.prependpath]$env:CONDA\Scripts"

ci/deps/azure-36-minimum_versions.yaml → ci/deps/azure-37-minimum_versions.yaml

@@ -2,11 +2,11 @@ name: pandas-dev
 channels:
   - conda-forge
 dependencies:
-  - python=3.6.1
+  - python=3.7.0
 
   # tools
   - cython=0.29.16
-  - pytest=5.0.1
+  - pytest=5.1.1
   - pytest-xdist>=1.21
   - hypothesis>=3.58.0
   - pytest-azurepipelines
@@ -15,16 +15,16 @@ dependencies:
   # pandas dependencies
   - beautifulsoup4=4.6.0
   - bottleneck=1.2.1
-  - jinja2=2.8
+  - jinja2=2.10
   - numba=0.46.0
-  - numexpr=2.6.2
-  - numpy=1.15.4
+  - numexpr=2.6.8
+  - numpy=1.16.0
   - openpyxl=2.5.7
-  - pytables=3.4.3
-  - python-dateutil=2.7.3
-  - pytz=2017.2
+  - pytables=3.5.1
+  - python-dateutil=2.7.4
+  - pytz=2018.3
   - scipy=1.2
   - xlrd=1.1.0
-  - xlsxwriter=0.9.8
-  - xlwt=1.2.0
+  - xlsxwriter=1.0.2
+  - xlwt=1.3.0
   - html5lib=1.0.1

ci/deps/azure-macos-36.yaml → ci/deps/azure-macos-37.yaml

@@ -2,7 +2,7 @@ name: pandas-dev
 channels:
   - defaults
 dependencies:
-  - python=3.6.*
+  - python=3.7.*
 
   # tools
   - pytest>=5.0.1

ci/deps/azure-windows-37.yaml

@@ -23,7 +23,7 @@ dependencies:
   - matplotlib=2.2.*
   - moto
   - numexpr
-  - numpy=1.18.*
+  - numpy=1.16.*
   - openpyxl
   - pyarrow=0.14
   - pytables

ci/deps/azure-windows-36.yaml → ci/deps/azure-windows-38.yaml

@@ -3,7 +3,7 @@ channels:
   - conda-forge
   - defaults
 dependencies:
-  - python=3.6.*
+  - python=3.8.*
 
   # tools
   - cython>=0.29.16
@@ -16,10 +16,10 @@ dependencies:
   - blosc
   - bottleneck
   - fastparquet>=0.3.2
-  - matplotlib=3.0.2
+  - matplotlib=3.1.3
   - numba
   - numexpr
-  - numpy=1.15.*
+  - numpy=1.18.*
   - openpyxl
   - jinja2
   - pyarrow>=0.13.0

ci/deps/travis-36-cov.yaml → ci/deps/travis-37-cov.yaml

@@ -3,7 +3,7 @@ channels:
   - defaults
   - conda-forge
 dependencies:
-  - python=3.6.*
+  - python=3.7.*
 
   # tools
   - cython>=0.29.16
@@ -26,7 +26,7 @@ dependencies:
   - moto
   - nomkl
   - numexpr
-  - numpy=1.15.*
+  - numpy=1.16.*
   - odfpy
   - openpyxl
   - pandas-gbq

ci/deps/travis-36-locale.yaml → ci/deps/travis-37-locale.yaml

@@ -3,7 +3,7 @@ channels:
   - defaults
   - conda-forge
 dependencies:
-  - python=3.6.*
+  - python=3.7.*
 
   # tools
   - cython>=0.29.16
@@ -19,22 +19,22 @@ dependencies:
   - html5lib
   - ipython
   - jinja2
-  - lxml=3.8.0
+  - lxml=4.3.0
   - matplotlib=3.0.*
   - moto
   - nomkl
   - numexpr
   - numpy
   - openpyxl
   - pandas-gbq=0.12.0
-  - psycopg2=2.6.2
+  - psycopg2=2.7
   - pymysql=0.7.11
   - pytables
   - python-dateutil
   - pytz
   - scipy
-  - sqlalchemy=1.1.4
-  - xarray=0.10
+  - sqlalchemy=1.3.0
+  - xarray=0.12.0
   - xlrd
   - xlsxwriter
   - xlwt

environment.yml

@@ -3,7 +3,7 @@ channels:
   - conda-forge
 dependencies:
   # required
-  - numpy>=1.15
+  - numpy>=1.16
   - python=3
   - python-dateutil>=2.7.3
   - pytz