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-rw-r--r--constraints.txt10
-rw-r--r--requirements.txt1
2 files changed, 9 insertions, 2 deletions
diff --git a/constraints.txt b/constraints.txt
index 8a74c51..04e6c11 100644
--- a/constraints.txt
+++ b/constraints.txt
@@ -1,3 +1,9 @@
-# Numpy 1.17 dropped support for Python 3.4.
-numpy >1.11,<1.17 ; python_version == '3.4'
+# matplotlib 1.5 is one of the versions that works with Python 3.4, and it
+# doesn't specify the upper bound for its numpy dependency. So pip will try to
+# install the latest version, which doesn't work with 3.4. Putting the numpy
+# and the matplotlib requirements to the same requirements.txt file doesn't
+# work unfortunately, the latest version will still get picked up.
+
+# The lower bound is random, 1.16 is the latest version to support 3.4.
+numpy >=1.11,<1.17 ; python_version == '3.4'
numpy >=1.17 ; python_version > '3.4'
diff --git a/requirements.txt b/requirements.txt
index 0e97461..9e942a5 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,3 +1,4 @@
+# Some random known-to-work versions.
matplotlib ~=1.5 ; python_version == '3.4'
matplotlib ~=2.1 ; python_version == '3.5'
matplotlib ~=3.1 ; python_version > '3.5'