default print format for floats

[beliavsky at aol.com]

By default, Python prints many floating point numbers with 17 digits
after the decimal place. I would like to make the DEFAULT 4 decimal
places. Is this possible?

For example, the code 

from string import join
x = [1.0,0.3,0.4]
print x
print join(["%4.1f" % y for y in x])

gives the output

[1.0, 0.29999999999999999, 0.40000000000000002]
 1.0  0.3  0.4

I want the simplicity of "print x", without so many decimal places.