how to make camera moves slower when moving along a curve I've been looking for a solution for several hours but got no luck..

Is there a way to make the camera's footstep smaller when moving "follow path"? (camera moves along a curve)

Put it another way, how can I decrease the distance on the curve that the camera moves between two frames? (in python script)

By default it moves way too fast...
With the curve selected;
Select the Object Data tab in the Properties window,
In the Path Animation panel change the Frames value, higher values result in a slower follow speed.




Edit:
This value can be modified in python using the following line;

bpy.data.curves["NurbsPath"].path_duration = X


where NurbsPath is the name of your curve, and X is the value you would like to set.