如何在 python 中将浮点数格式化为字符串？

Question

def main():
    M = float(input('Please enter sales for Monday: '))
    T = float(input('Please enter sales for Tuesday: '))
    W = float(input('Please enter sales for Wednesday: '))
    R = float(input('Please enter sales for Thursday: '))
    F = float(input('Please enter sales for Friday: '))
    sales = [M, T, W, R, F]

        total = 0 

    for value in sales:
        total += value

    print ('The total sales for the week are: $',total('.2f'))

main()

使用 .2f 格式时出现此异常：

TypeError: 'float' object is not callable

如果我删除 .2f 脚本运行正常，但格式不是我想要的，它显示为：

The total sales for the week are: $ 2500.0

我希望它有 2 个小数位并且 $ 符号之间没有 space。

python 还很陌生，正在学习基础知识。非常感谢您的帮助。

Answer 1

您可以使用内置的 sum 函数汇总列表。试试 print(sum(sales)).

你可以像这样格式化你的浮点数print(f'Week is {sum(sales):.2f}')

小尼特。

继续黑客攻击！做笔记。

Answer 2

这是一个使用 python 的 3 f-string 功能的解决方案

print (f'The total sales for the week are: {total:.2f}')

Answer 3

在 python 中，您可以用多种方式格式化字符串。这里有一些关于它们的好资源：

https://docs.python.org/3/library/string.html
https://realpython.com/python-string-formatting/
http://pyformat.info – （不包括 f 字符串格式）

对于您的情况，您可以像这样格式化总值：

>>> total = 1234.56789

>>> "{:.2f}".format(total)
'1234.57'

>>> "%.2f" % total
'1234.57'

# This only works in 3.7 and later
>>> f"{total:.2f}"
'1234.57'

对于您的特定情况，您可以一次性格式化整个 print 字符串：

print(f"The total sales for the week are: ${total:.2f}")

Answer 4

替换

print ('The total sales for the week are: $',total('.2f'))

为了

print ('The total sales for the week are: $',"{0:.2f}".format(total))

Answer 5

在此处查看Limiting floats to two decimal points

示例代码

def main():
    M = float(input('Please enter sales for Monday: '))
    T = float(input('Please enter sales for Tuesday: '))
    W = float(input('Please enter sales for Wednesday: '))
    R = float(input('Please enter sales for Thursday: '))
    F = float(input('Please enter sales for Friday: '))
    sales = [M, T, W, R, F]

    total = 0 

    for value in sales:
        total += value
    total = "{0:.2f}".format(total)
    print ('The total sales for the week are: $' + str(total))

main()

Answer 6

只需更正一下：

print('The total sales for the week are:',format(total,('.2f')),'$')

Answer 7

Python 中的格式化程序允许您使用花括号作为值的占位符，这些值将通过 str.format() 方法传递。

根据您的要求

total = 0 
print ('The total sales for the week are: $',"{0:.2f}".format(total))

如何在 python 中将浮点数格式化为字符串？

How can I format a float as a string in python?

python

python-3.7