python字符串拼接顺序从快到慢
s1 = 'Hello'
s2 = 'Python'
f'{s1} {s2}'#fast,f-string
s1 + ' ' + s2
' '.join(s1, s2)
'%s %s' % (s1, s2)
'{} {}'.format(s1, s2)
Template('$s1 $s2').substitute(s1=s1, s2=s2)#low
s1 = 'Hello'
s2 = 'Python'
f'{s1} {s2}'#fast,f-string
s1 + ' ' + s2
' '.join(s1, s2)
'%s %s' % (s1, s2)
'{} {}'.format(s1, s2)
Template('$s1 $s2').substitute(s1=s1, s2=s2)#low