Fix jupyterlite install errors (#876)

CHANGELOG.md

@@ -1,5 +1,9 @@
 # Changelog
 
+**v6.0.2:**
+
+* Fixed dependency issues when installing on JupyterLite per [#875](https://github.com/ucbds-infra/otter-grader/issues/875)
+
 **v6.0.1:**
 
 * Updated dependency specifications to support any new minor version within the matching major version

otter/check/utils.py

@@ -147,7 +147,6 @@ def running(self) -> bool:
             ``bool``: whether this interpreter is running
         """
         ipython_interp = str(get_ipython())
-        print(ipython_interp)
         return any(c in ipython_interp for c in self.check_strs)
 
 

otter/export/exporters/via_html.py

@@ -1,13 +1,22 @@
 """PDF via HTML exporter"""
 
-import nbconvert
 import os
 
 from typing import Any
 
 from .base_exporter import BaseExporter, TEMPLATE_DIR
 
 
+# nbconvert can't be used on jupyterlite, so try importing it and raise an error if it's not found
+# when the exporter is used
+_NBCONVERT_ERROR = None
+try:
+    import nbconvert
+except ImportError as e:
+    nbconvert = None
+    _NBCONVERT_ERROR = e
+
+
 class PDFViaHTMLExporter(BaseExporter):
     """
     An exporter that uses nbconvert's WebPDF exporter to convert notebooks to PDFs via HTML.
@@ -21,6 +30,9 @@ class PDFViaHTMLExporter(BaseExporter):
 
     @classmethod
     def convert_notebook(cls, nb_path: str, dest: str, **kwargs: Any):
+        if nbconvert is None:
+            raise _NBCONVERT_ERROR
+
         options = cls.default_options.copy()
         options.update(kwargs)
 

otter/export/exporters/via_latex.py

@@ -1,6 +1,5 @@
 """PDF via LaTeX exporter"""
 
-import nbconvert
 import os
 import warnings
 
@@ -10,6 +9,16 @@
 from .base_exporter import BaseExporter, ExportFailedException, TEMPLATE_DIR
 
 
+# nbconvert can't be used on jupyterlite, so try importing it and raise an error if it's not found
+# when the exporter is used
+_NBCONVERT_ERROR = None
+try:
+    import nbconvert
+except ImportError as e:
+    nbconvert = None
+    _NBCONVERT_ERROR = e
+
+
 class PDFViaLatexExporter(BaseExporter):
     """
     An exporter that uses nbconvert's PDF exporter to convert notebooks to PDFs via LaTeX.
@@ -28,6 +37,9 @@ class PDFViaLatexExporter(BaseExporter):
 
     @classmethod
     def convert_notebook(cls, nb_path: str, dest: str, *, xecjk: bool = False, **kwargs: Any):
+        if nbconvert is None:
+            raise _NBCONVERT_ERROR
+
         warnings.filterwarnings("ignore", r"invalid escape sequence '\\c'", DeprecationWarning)
 
         options = cls.default_options.copy()

pyproject.toml

@@ -39,16 +39,16 @@ ipykernel = { version = "*", optional = true}
 ipylab = "^1.0.0"
 ipython = "*"
 ipywidgets = "^8.1.5"
-jinja2 = "^3.1.4"
+jinja2 = "^3.1"
 jupyter_client = { version = "*", optional = true}
 jupytext = "^1.16.4"
 nbconvert = { version = ">=6.0.0", extras = ["webpdf"], markers = "sys_platform != 'emscripten' and sys_platform != 'wasi'" }
 nbformat = ">=5.0.0"
 pandas = ">=2.0.0"
 pypdf = { version = "*", optional = true }
 python-on-whales = ">=0.72.0,<1.0.0"
-pyyaml = "^6.0.2"
-requests = "^2.32.3"
+pyyaml = "^6"
+requests = "^2.31"
 rpy2 = { version = "^3.5.16", optional = true }
 wrapt = "^1.16.0"