..can't get ipython installed in this CI

.github/workflows/ccpp.yml

@@ -1,19 +1,19 @@
-name: C/C++ CI
-
-on: [push]
-
-jobs:
-  build:
-
-    runs-on: ubuntu-latest
-
-    steps:
-    - uses: actions/checkout@v2
-    - name: Install Eigen and Pybind11
-      run: sudo apt update && sudo apt install -y libeigen3-dev && pip3 install pybind11 pytest numpy scipy ipython
-    - name: Compile
-      run: export CPATH=/usr/include/eigen3 && cd python && source build.sh
-    - name: Test
-      run: |
-        cd python
+name: C/C++ CI
+
+on: [push]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Install Eigen and Pybind11
+      run: sudo apt update && sudo apt install -y libeigen3-dev && pip3 install pybind11 pytest numpy scipy
+    - name: Compile
+      run: export CPATH=/usr/include/eigen3 && cd python && source build.sh
+    - name: Test
+      run: |
+        cd python
         python3 -m pytest -s -v test.py