Update 2.7

Author: mal

2.7/Dockerfile

@@ -51,9 +51,9 @@ RUN set -ex \
 # ("Requirement already up-to-date: pip==8.1.2 in /usr/local/lib/python3.6/site-packages")
 # https://github.com/docker-library/python/pull/143#issuecomment-241032683
 	&& pip install --no-cache-dir --upgrade --force-reinstall "pip==$PYTHON_PIP_VERSION" \
-# then we use "pip list" to ensure we don't have more than one pip version installed
+# then we use "pip freeze" to ensure we don't have more than one pip version installed
 # https://github.com/docker-library/python/pull/100
-	&& [ "$(pip list |tac|tac| awk -F '[ ()]+' '$1 == "pip" { print $2; exit }')" = "$PYTHON_PIP_VERSION" ] \
+	&& [ "$(pip freeze --all |tac|tac| awk -F '==' '$1 == "pip" { print $2; exit }')" = "$PYTHON_PIP_VERSION" ] \
 	\
 	&& find /usr/local -depth \
 		\( \

2.7/alpine/Dockerfile

@@ -68,9 +68,9 @@ RUN set -ex \
 # ("Requirement already up-to-date: pip==8.1.2 in /usr/local/lib/python3.6/site-packages")
 # https://github.com/docker-library/python/pull/143#issuecomment-241032683
 	&& pip install --no-cache-dir --upgrade --force-reinstall "pip==$PYTHON_PIP_VERSION" \
-# then we use "pip list" to ensure we don't have more than one pip version installed
+# then we use "pip freeze" to ensure we don't have more than one pip version installed
 # https://github.com/docker-library/python/pull/100
-	&& [ "$(pip list |tac|tac| awk -F '[ ()]+' '$1 == "pip" { print $2; exit }')" = "$PYTHON_PIP_VERSION" ] \
+	&& [ "$(pip freeze --all |tac|tac| awk -F '==' '$1 == "pip" { print $2; exit }')" = "$PYTHON_PIP_VERSION" ] \
 	\
 	&& find /usr/local -depth \
 		\( \

2.7/slim/Dockerfile

@@ -66,9 +66,9 @@ RUN set -ex \
 # ("Requirement already up-to-date: pip==8.1.2 in /usr/local/lib/python3.6/site-packages")
 # https://github.com/docker-library/python/pull/143#issuecomment-241032683
 	&& pip install --no-cache-dir --upgrade --force-reinstall "pip==$PYTHON_PIP_VERSION" \
-# then we use "pip list" to ensure we don't have more than one pip version installed
+# then we use "pip freeze" to ensure we don't have more than one pip version installed
 # https://github.com/docker-library/python/pull/100
-	&& [ "$(pip list |tac|tac| awk -F '[ ()]+' '$1 == "pip" { print $2; exit }')" = "$PYTHON_PIP_VERSION" ] \
+	&& [ "$(pip freeze --all |tac|tac| awk -F '==' '$1 == "pip" { print $2; exit }')" = "$PYTHON_PIP_VERSION" ] \
 	\
 	&& find /usr/local -depth \
 		\( \

2.7/wheezy/Dockerfile

@@ -51,9 +51,9 @@ RUN set -ex \
 # ("Requirement already up-to-date: pip==8.1.2 in /usr/local/lib/python3.6/site-packages")
 # https://github.com/docker-library/python/pull/143#issuecomment-241032683
 	&& pip install --no-cache-dir --upgrade --force-reinstall "pip==$PYTHON_PIP_VERSION" \
-# then we use "pip list" to ensure we don't have more than one pip version installed
+# then we use "pip freeze" to ensure we don't have more than one pip version installed
 # https://github.com/docker-library/python/pull/100
-	&& [ "$(pip list |tac|tac| awk -F '[ ()]+' '$1 == "pip" { print $2; exit }')" = "$PYTHON_PIP_VERSION" ] \
+	&& [ "$(pip freeze --all |tac|tac| awk -F '==' '$1 == "pip" { print $2; exit }')" = "$PYTHON_PIP_VERSION" ] \
 	\
 	&& find /usr/local -depth \
 		\( \