Python-сообщество

a=["OBpl2", "OBtl", "OBpl3"]
b=[s for s in a if s.startswith("OBpl")]
c=[s for s in a if "OBpl" in s]

>>> [item for item in ["OBpl2", "OBtl", "OBpl3"] if item.startswith("OBpl")]
['OBpl2', 'OBpl3']

>>> filter(lambda item: item.startswith("OBpl"),["OBpl2", "OBtl", "OBpl3"])
['OBpl2', 'OBpl3']

l = ["".join([chr(random.randint(97, 122)) for i in range(random.randint(5,10))]) for i in range(100000)]
def f1(sub):
	l_sub = len(sub)
	return [s for s in l if s[:l_sub] == sub]

def f2(sub):
	return [s for s in l if s.startswith(sub)]

>>> cProfile.run("f1('abc')")
         4 function calls in 0.130 CPU seconds

   Ordered by: standard name

   ncalls  tottime  percall  cumtime  percall filename:lineno(function)
        1    0.130    0.130    0.130    0.130 <stdin>:1(f1)
        1    0.000    0.000    0.130    0.130 <string>:1(<module>)
        1    0.000    0.000    0.000    0.000 {len}
        1    0.000    0.000    0.000    0.000 {method 'disable' of '_lsprof.Profiler' objects}


>>> cProfile.run("f2('abc')")
         100003 function calls in 0.380 CPU seconds

   Ordered by: standard name

   ncalls  tottime  percall  cumtime  percall filename:lineno(function)
        1    0.210    0.210    0.380    0.380 <stdin>:1(f2)
        1    0.000    0.000    0.380    0.380 <string>:1(<module>)
        1    0.000    0.000    0.000    0.000 {method 'disable' of '_lsprof.Profiler' objects}
   100000    0.170    0.000    0.170    0.000 {method 'startswith' of 'str' objects}

>>>