python时间分钟运算实现方法

a='17:30'
b='18:59'
time_a_one=int(a.split(':')[0])
time_a_two=int(a.split(':')[1])/60
time_a=time_a_one+time_a_two

time_b_one=int(b.split(':')[0])
time_b_two=int(b.split(':')[1])/60
time_b=time_b_one+time_b_two
time_sum=round(time_b-time_a,2)
print(time_sum)
#1.48