[pypy-issue] Issue #1978: readline: tab should insert 4 spaces when at start of line (pypy/pypy)

[Armin Rigo]

New issue 1978: readline: tab should insert 4 spaces when at start of line
https://bitbucket.org/pypy/pypy/issue/1978/readline-tab-should-insert-4-spaces-when

Armin Rigo:

In the interactive prompt:

```
#!python

>>>> if 1:
.... <press tab here>
```

Pressing tab here should just insert 4 spaces.  It makes no sense to display all 500 possible "completions" of the empty word, and using tab to indent is a very common feature of any editor with a Python mode.