Produce a warning when the installation of both pypdf & fpdf2 package…

…s is detected (#1042)

CHANGELOG.md

@@ -18,8 +18,8 @@ This can also be enabled programmatically with `warnings.simplefilter('default',
 
 ## [2.7.7] - Not released yet
 ### Added
-* basic support for `<image>` elements in SVG vector graphics inserted
-* SVG importing now supports clipping paths, and `defs` tags anywhere in the SVG file
+* Basic support for `<image>` elements in SVG vector graphics inserted
+* SVG importing now supports clipping paths, and `<defs>` tags anywhere in the SVG file
 * [`FPDF.fonts.FontFace`](https://py-pdf.github.io/fpdf2/fpdf/fonts.html#fpdf.fonts.FontFace): Now has a static `combine` method that allows overriding a default FontFace (e.g. for specific cells in a table). Unspecified properties of the override FontFace retain the values of the default.
 * [`TextColumns()`](https://py-pdf.github.io/fpdf2/TextColumns.html) can now have images inserted (both raster and vector).
 * [`TextColumns()`](https://py-pdf.github.io/fpdf2/TextColumns.html) can now advance to the next column with the new `new_column()` method or a FORM_FEED character (`\u000c`) in the text.

fpdf/__init__.py

@@ -15,7 +15,7 @@
 * `fpdf.template.FlexTemplate`
 """
 
-import sys
+import warnings, sys
 
 from .enums import Align, TextMode, XPos, YPos
 from .errors import FPDFException
@@ -31,6 +31,19 @@
 from .template import Template, FlexTemplate
 from .deprecation import WarnOnDeprecatedModuleAttributes
 
+try:
+    # This module only exists in PyFPDF, it has been removed in fpdf2 since v2.5.7:
+    # pylint: disable=import-self
+    from . import ttfonts
+
+    warnings.warn(
+        "You have both PyFPDF & fpdf2 installed. "
+        "Both packages cannot be installed at the same time as they share the same module namespace. "
+        "To only keep fpdf2, run: pip uninstall --yes pypdf && pip install --upgrade fpdf2"
+    )
+except ImportError:
+    pass  # no PyFPDF installation detected
+
 FPDF_VERSION = _FPDF_VERSION
 "Current fpdf2 version, also available as `__version__`"