如何使用 f 字符串在列表中舍入

Question

I want to round some numbers inside of a list by using f-string, but it returns

unsupported format string passed to list.__format__

This is my code

IS_gradebooks = [['ISOM2020', [59, 100, 80, 55, 95, 87, 95, 98, 74, 69, 92, 94, 75, 97, 43, 57]],
                 ['ISOM3400', [98, 73, 45, 88, 72, 94, 82, 100, 89, 52]], 
                 ['ISOM3600', [24, 44, 100, 81, 91, 93, 87, 72, 55]],
                 ['ISOM4200', [90, 56, 78, 67, 90, 93]]
                ]
bruh=IS_gradebooks
for i in range(len(bruh)):
  a=sum(bruh[i][1])/len(bruh[i][1]) 
  bruh[i][1]=a
print(f"{bruh:.2f}")

Answer 1

You can change the variable bruh[i][1] to "{0:.2f}".format(a) and print that variable inside the loop:

for i in range(len(bruh)):
  a=sum(bruh[i][1])/len(bruh[i][1]) 
  bruh[i][1]="{0:.2f}".format(a)
  print(bruh[i])