```
While I input
```

pretty_print(sqrt(2)) it gets the following in notebook():

??? ?? 2

It tested in Sage-4.7.2/4.7.1? What's wrong here?

Thanks inadvance

1 | initial version |

```
While I input
```

pretty_print(sqrt(2)) it gets the following in notebook():

??? ?? 2

It tested in Sage-4.7.2/4.7.1? What's wrong here?

Thanks inadvance

2 | No.2 Revision |

While I input

~~ While I input
~~pretty_print(sqrt(2))

~~pretty_print(sqrt(2))
~~it gets the following in notebook():

```
???
??
```~~2 ~~2

It tested in Sage-4.7.2/4.7.1? What's wrong here?

Thanks inadvance

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