Hello. One possible way to do this is using the double question sign operator (??). For example:
A.add_multiple_of_row??
will show you something like
Source:
def add_multiple_of_row(self, Py_ssize_t i, Py_ssize_t j, s, Py_ssize_t start_col=0):
"""
Add s times row j to row i.
EXAMPLES: We add -3 times the first row to the second row of an
integer matrix, remembering to start numbering rows at zero::
sage: a = matrix(ZZ,2,3,range(6)); a
[0 1 2]
[3 4 5]
sage: a.add_multiple_of_row(1,0,-3)
sage: a
[ 0 1 2]
[ 3 1 -1]
Etc...
Unfortunately, as you might guess, this was intended to show not only the docstring, but the whole code. That is why you see strange data types like Py_ssize_t, which comes from Cython, acombination of C and Python, in which this particular subroutine is written. If you don't know the meaning of the keyword self, it is safe to ignore it.
However, this should not be a problem, since the docstring will guide you further, and it is difficult to run into Cython implementations in every-day use of SageMath. Just ignore strange data types and also self: consider the signature of the subroutine to be
def add_multiple_of_row(i, j, s, start_col=0):
You can also use help(A.add_multiple_of_row), which will show the same, except for the part of the code. (I have not experimented much with this command.)
