格式问题

'''
a = eval(input())
s = "Hello World"
l =len(s)
if(a==0):
   print(s)
elif(a>0):
     for i in range (0,l-1,2):
         print(s[i],s[i+1],sep='')#默认字符间有空格
     print("d")
else:
    for i in range(0,l):
        print(s[i])
'''
a = input()
for i in a:
    print(i,end='')
123
123
#默认换行
123
1
2
3

x= 0.365
y=36.251
print("{:.2f}, {:.2f}".format(x,y))

0.36, 36.25#不会四舍五入

he,we = eval(input())
bmi = we/pow(he,2)
print("BMI 数值为 : {:.2f}".format(bmi))
who,nat = "",''
if bmi < 18.5:
    who,nat = "偏瘦","偏瘦"