d3dave's answer is cool. However theGreenGarbage mentioned an issue about it which I too find rather annoying. So here's one that doesn't immediately suggest something after '=' sign and when typing blank space:
ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz.(!+-*/~,[{@#$%^&
What I did was simply remove the space and '=' chars from the array :)
Alternatively if you want suggestions when typing blank space, but not after '=' sign:
ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz .(!+-*/~,[{@#$%^&