Python3 find string

 

from datetime import datetime

def f1(s,r):

t1 = datetime.utcnow()

if r in s:

t2 = datetime.utcnow()

delta = t2 - t1

print(f'found in {delta.total_seconds()}')

else:

t2 = datetime.utcnow()

delta = t2 - t1

print(f'Not found in {delta.total_seconds()}')

def f2(s,r):

t1 = datetime.utcnow()

idx = s.find(r)

t2 = datetime.utcnow()

delta = t2 - t1

if idx > 0:

print(f'found in {delta.total_seconds()}')

else:

print(f'Not found in {delta.total_seconds()}')

if '__main__' == __name__:

s1 = '1'*10000

s2 = 'abc def ghi jkl mno pqr stu vwx yz'

s3 = '3'*10000

s = f'{s1} {s2} {s3}'

f1(s, 'ghi jkl')

f2(s, 'ghi jkl')

Kết quả cho thấy hàm str.find() tìm kiếm nhanh hơn.