Hmmm... Vincent, I beg to differ.

What's wrong with :

```
sage: A=[1,3,2,5]
sage: B=[2,2,1,3]
sage: r.t_test(A,B) ## Note : "t_test", NOT "t.test" !!! See below
Welch Two Sample t-test
data: sage4 and sage9
t = 0.79241, df = 4.3033, p-value = 0.4695
alternative hypothesis: true difference in means is not equal to 0
95 percent confidence interval:
-1.806398 3.306398
sample estimates:
mean of x mean of y
2.75 2.00
```

?

And, BTW :

```
sage: r.t_test(A,B).sage()
{'DATA': {'alternative': 'two.sided',
'conf_int': {'DATA': [-1.80639768054045, 3.30639768054045],
'conf_level': 0.95},
'data_name': 'sage5 and sage0',
'estimate': {'DATA': [2.75, 2], '_Names': ['mean of x', 'mean of y']},
'method': 'Welch Two Sample t-test',
'null_value': {'DATA': 0, '_Names': 'difference in means'},
'p_value': 0.469526519083806,
'parameter': {'DATA': 4.3033359193173, '_Names': 'df'},
'statistic': {'DATA': 0.792405815693061, '_Names': 't'}},
'_Names': ['statistic',
'parameter',
'p.value',
'conf.int',
'estimate',
'null.value',
'alternative',
'method',
'data.name'],
'_r_class': 'htest'}
```

The point is, don't forget to replace the "." in R's object's names with "_" (the dot is a "normal character" in R, whereas it has a syntactic value in Python ; the underscore is a "normal character" in Python, whereas it used to represent symbol assignment in (antique versions of) R).

This has been documented ; but I didn't check if this documentation still exists...