don't depend on matplotlib unless -svg is passed on command line (#376)

* Suppress wrong import position warnings

* don't depend on matplotlib unless -svg is passed on command line

cc @tomaird

Author: aswaterman

.pylintrc

@@ -18,6 +18,8 @@ disable=
     too-many-statements,
     # Handled by Black.
     line-too-long,
+    # Conditional dependence on matplotlib
+    import-outside-toplevel,
     # This is technically correct but not that important.
     logging-fstring-interpolation,
     # TODO: These should be enabled but writing documentation for

svg_utils.py

@@ -2,9 +2,6 @@
 import pprint
 from typing import Dict, List, NamedTuple
 
-from matplotlib import patches
-from matplotlib import pyplot as plt
-
 from rv_colors import palette
 from shared_utils import InstrDict, instr_dict_2_extensions
 
@@ -77,6 +74,9 @@ def plot_image(
 ) -> None:
     """Plot the instruction rectangles using matplotlib."""
 
+    from matplotlib import patches
+    from matplotlib import pyplot as plt
+
     def get_readable_font_color(bg_hex: str) -> str:
         """Determine readable font color based on background color."""