TAB completion

IPython supports TAB completion: write a part of a command or name (variable, function, module), hit the TAB key, and IPython will complete the word or show different alternatives: 
In [1]: import math

In [2]: math.<TABKEY>
math.__class__         math.__str__           math.frexp
math.__delattr__       math.acos              math.hypot
math.__dict__          math.asin              math.ldexp
...
or 
In [2]: my_variable_with_a_very_long_name = True

In [3]: my<TABKEY>
In [3]: my_variable_with_a_very_long_name
You can increase your typing speed with TAB completion!

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