各位大佬，刚学python，求问这个是什么意思啊：
TypeError: unsupported format string passed to builtin_function_or_method.__format
scale=50
print("执行开始".center(scale//2,"-"))
start=time.perf_counter()
for i in range(scale+1):
a=''i
b='.'(scale-i)
c=(i/scale)100
dur=time.perf_counter
print("\r{:^3.0f}%[{}->{}]{:.2f}s".format(c,a,b,dur),end="")
time.sleep(0.1)
print("\n"+"执行结束".center(scale//2,'-'))
麻烦各位大佬了
