Show full (non-scientific-notation) of very small decimal?

edit

You can look at the no_sci option of the str method of a floating-point number:

sage: a = 1/(2^70).n()
sage: a
8.47032947254300e-22
sage: a.str(no_sci=2)
'0.000000000000000000000847032947254300'

To get the doc of the str method, you can do a.str?

One possibility to get what you want is to use Python string formatting.

This can be done the old way with % and the new way with {}and .format. The old way will accept many types of numbers, the new way requires the entry to have the type of a Python float.

Here is an illustration of both, with 72 digits after the decimal point.

sage: a = 1/2^70
sage: '%.72f' % a
'0.000000000000000000000847032947254300339068322500679641962051391601562500'
sage: '{:.72f}'.format(float(a))
'0.000000000000000000000847032947254300339068322500679641962051391601562500'

Combine with print to get those displayed without the surrounding ' quotes.

sage: a = 1/2^70
sage: aa = '%.72f' % a
sage: print(aa)
0.000000000000000000000847032947254300339068322500679641962051391601562500
sage: ab = '{:.72f}'.format(float(a))
sage: print(ab)
0.000000000000000000000847032947254300339068322500679641962051391601562500

Related reading:

• http://ask.sagemath.org/question/1105...
• Python 2 documentation: https://docs.python.org/2/library/str...
• Python 3 documentation: https://docs.python.org/3/library/str...