更快的strptime？

fromisoformat()

从Python 3.7开始，

datetime

fromisoformat

strptime()

显式的字符串切片可能使您的性能比普通字符串提高9 倍

strptime

fromisoformat

%timeit isofmt(datelist)569 µs ± 8.45 µs per loop (mean ± std. dev. of 7 runs, 1000 loops each)%timeit slice2int(datelist)5.51 ms ± 48.9 µs per loop (mean ± std. dev. of 7 runs, 100 loops each)%timeit normalstrptime(datelist)52.1 ms ± 1.27 ms per loop (mean ± std. dev. of 7 runs, 10 loops each)from datetime import datetime, timedeltabase, n = datetime(2000, 1, 1, 1, 2, 3, 420001), 10000datelist = [(base + timedelta(days=i)).strftime('%Y-%m-%d') for i in range(n)]def isofmt(l):    return list(map(datetime.fromisoformat, l))def slice2int(l):       def slicer(t):        return datetime(int(t[:4]), int(t[5:7]), int(t[8:10]))    return list(map(slicer, l))def normalstrptime(l):    return [datetime.strptime(t, '%Y-%m-%d') for t in l]print(isofmt(datelist[0:1]))print(slice2int(datelist[0:1]))print(normalstrptime(datelist[0:1]))# [datetime.datetime(2000, 1, 1, 0, 0)]# [datetime.datetime(2000, 1, 1, 0, 0)]# [datetime.datetime(2000, 1, 1, 0, 0)]

Python 3.8.3rc1 x64 / Win10