四则运算
1 print(2+3) 2 print(2-3) 3 print(2*3) 4 print(2/3) 5 print(2//3) 6 print(2%3) 7 8 5 9 -1 10 6 11 0.6666666666666666 12 0 13 2
a = input() x = eval(a) x+=1 x++ #错的 print(x)
>>> 6**3 216 import math >>> math.e**4 54.59815003314423
>>> 1/(math.e**(-1.9)+1)
0.8698915256370021
