5.1.7 Warnings

Sloppy imports can cause trouble; e.g., if you do
```
from XYZ import XYZclass
```
then XYZclass is a name in M.__dict__ too, and doctest has no way to know that XYZclass wasn't defined in M. So it may try to execute the examples in XYZclass's docstring, and those in turn may require a different set of globals to work correctly. I prefer to do ``import *''-friendly imports, a la
```
from XYZ import XYZclass as _XYZclass
```
and then the leading underscore makes _XYZclass a private name so testmod skips it by default. Other approaches are described in doctest.py.
doctest is serious about requiring exact matches in expected output. If even a single character doesn't match, the test fails. This will probably surprise you a few times, as you learn exactly what Python does and doesn't guarantee about output. For example, when printing a dict, Python doesn't guarantee that the key-value pairs will be printed in any particular order, so a test like
```
>>> foo()
{"Hermione": "hippogryph", "Harry": "broomstick"}
>>>
```
is vulnerable! One workaround is to do
```
>>> foo() == {"Hermione": "hippogryph", "Harry": "broomstick"}
1
>>>
```
instead. Another is to do
```
>>> d = foo().items()
>>> d.sort()
>>> d
[('Harry', 'broomstick'), ('Hermione', 'hippogryph')]
```
There are others, but you get the idea.
Another bad idea is to print things that embed an object address, like
```
>>> id(1.0) # certain to fail some of the time
7948648
>>>
```
Floating-point numbers are also subject to small output variations across platforms, because Python defers to the platform C library for float formatting, and C libraries vary widely in quality here.
```
>>> 1./7  # risky
0.14285714285714285
>>> print 1./7 # safer
0.142857142857
>>> print round(1./7, 6) # much safer
0.142857
```
Numbers of the form I/2.**J are safe across all platforms, and I often contrive doctest examples to produce numbers of that form:
```
>>> 3./4  # utterly safe
0.75
```
Simple fractions are also easier for people to understand, and that makes for better documentation.
Be careful if you have code that must only execute once.
If you have module-level code that must only execute once, a more foolproof definition of _test() is
```
def _test():
    import doctest, sys
    doctest.testmod(sys.modules["__main__"])
```

See About this document... for information on suggesting changes.

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