Help arcpy to update fields for features which with in distance 50 meter inside buffer

[AmirHassan]

Hello every one,

I need python code do that: iterate in featureclass it's name "STREET" it have 100 line feature and it had afield named "STREET_NA" and need make buffer for each line

then itrate all other features name is "MANHOLE" & "MAINLINES" type is points and lines  and it had afield name "STREETNAME" if this features had objects inside a buffer(with in distance)  50meter i need "STREETNAME" field =="STREET_NA" field in the buffer which include it

and make it for the 100 buffer.

thanks