There is a multiplication sign (*) missing:
sage: AA = y*(1-y)-0.2*(1-0.7*cos(2*pi*x))
sage: AA = y(1-y)-0.2*(1-0.7*cos(2*pi*x))
Traceback (most recent call last)
...
TypeError: number of arguments does not match number of variables in parent
Then it works (with a deprecation warning):
sage: eulers_method(AA,0,1,1/2,1)
x y h*f(x,y)
.../sage-git/local/lib/python2.7/site-packages/sage/misc/decorators.py:705:
DeprecationWarning: Substitution using function-call syntax and unnamed
arguments is deprecated and will be removed from a future release of Sage;
you can use named arguments instead, like EXPR(x=..., y=...)
See http://trac.sagemath.org/5930 for details.
return func(*args, **kwds)
0 1 -0.0300000000000000
1/2 0.970000000000000 -0.155450000000000
1 0.814550000000000 0.0455291487500000
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