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venv/lib/python3.9/site-packages/IPython/testing/plugin/test_example.txt

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+=====================================
+ Tests in example form - pure python
+=====================================
+
+This file contains doctest examples embedded as code blocks, using normal
+Python prompts.  See the accompanying file for similar examples using IPython
+prompts (you can't mix both types within one file). The following will be run
+as a test::
+
+    >>> 1+1
+    2
+    >>> print ("hello")
+    hello
+
+More than one example works::
+
+    >>> s="Hello World"
+
+    >>> s.upper()
+    'HELLO WORLD'
+
+but you should note that the *entire* test file is considered to be a single
+test.  Individual code blocks that fail are printed separately as ``example
+failures``, but the whole file is still counted and reported as one test.