LPTHW-.format（）问题

Question

我有此错误：元组索引超出范围

我完全理解为什么会出现此错误，因为我需要3个变量{} {} {}，而在我的.format（）中，我只放置了1个值。

但是这个值是一个函数，到目前为止，我们已经习惯了使用int，str等值。

顺便说一句，我正在Python 3.7中进行编码，那么如何使它在此版本的Python下工作？谢谢

print("Let's practise everything.")
print('You\'d need to know \'bout espaces with \\ that do \n newlines and \t tabs.')

poem = """
\tThe lovely world
with logic so firmly planted
cannot discern \n the needs of love
nor comprehend passion from intuition
and requires an explanation
\n\t\twhere there is none.
"""

print("-----------")
print(poem)
print("-----------")

five = 10 - 2 + 3 - 6
print("This should be five: {}".format(five))

def secret_formula(started):
    jelly_beans = started * 500
    jars = jelly_beans / 1000
    crates = jars / 100
    return(jelly_beans, jars, crates)

start_point = 10000
beans, jars, crates = secret_formula(start_point)

print("With a starting point of: {}".format(start_point))
print("We'd have {} beans, {} jars, {} crates.".format(beans, jars, crates))

start_point = start_point / 10

print("We can also do that this way:")
print("We'd have {} beans, {} jars, and {} crates.".format(secret_formula(start_point))))