a, b = 0, 1 
while b < 1000: 
 print(b, end=',') 
 a, b = b, a+b 
1,1,2,3,5,8,13,21,34,55,89,144,233,377,610,987,

a, b = 0, 1 
while b < 1000: 
 print(b, end=' ') 
 a, b = b, a+b 

1 1 2 3 5 8 13 21 34 55 89 144 233 377 610 987 

print(...)
 print(value, ..., sep=' ', end='\n', file=sys.stdout, flush=False)
 
 Prints the values to a stream, or to sys.stdout by default.
 Optional keyword arguments:
 file: a file-like object (stream); defaults to the current sys.stdout.
 sep: string inserted between values, default a space.
 end: string appended after the last value, default a newline.
 flush: whether to forcibly flush the stream.