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

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+=================================
+ Tests in example form - IPython
+=================================
+
+You can write text files with examples that use IPython prompts (as long as you
+use the nose ipython doctest plugin), but you can not mix and match prompt
+styles in a single file.  That is, you either use all ``>>>`` prompts or all
+IPython-style prompts.  Your test suite *can* have both types, you just need to
+put each type of example in a separate. Using IPython prompts, you can paste
+directly from your session::
+
+    In [5]: s="Hello World"
+
+    In [6]: s.upper()
+    Out[6]: 'HELLO WORLD'
+
+Another example::
+
+    In [8]: 1+3
+    Out[8]: 4
+
+Just like in IPython docstrings, you can use all IPython syntax and features::
+
+    In [9]: !echo hello
+    hello
+
+    In [10]: a='hi'
+
+    In [11]: !echo $a
+    hi