Question

我正在做一个小程序，以2个数字和迭代计数作为输入来可视化混沌函数。

格式化打印件时，我遇到标题中所述的错误

我尝试使用{：^ n}标签指定要占用的宽度，并使打印值居中于该宽度内

def main():

    print("This program illustrates a chaotic function")
    x = float(input("Enter a number between 0 and 1: "))
    y = float(input("Enter another number between 0 and 1: "))
    n = int(input("How many iterations do you want to see?: "))

    print(("{0:0}{1:^9f}{2:^9f}").format("index", x, y))
    print("_" * 23)

    for i in range(n):
        x = 3.9 * x * (1 - x)
        y = 3.9 * y * (1 - y)
        print(("{0:^5}{1:^9}{2:^9}").format(range(n).index(i) + 1, x, y))


Error:

Traceback (most recent call last):
  File ".\chaos.py", line 18, in <module>
    main()
  File ".\chaos.py", line 10, in main
    print(("{0:0}{1:^9f}{2:^9f}").format("index", x, y))
ValueError: '=' alignment not allowed in string format specifier

输出应该是格式正确的表。

Answer 1

这是因为您尝试使用"index"格式化字符串":0"，将其更改为"^10"之类，并且至少会运行：

print(("{0:^10}{1:^9f}{2:^9f}").format("index", x, y))

ValueError：字符串格式说明符中不允许'='对齐

1 个答案: