如何在python中将输入数字转换为百分比

How to turn input number into a percentage in python

提问by Griffin Filmz

print ("How much does your meal cost")

meal = 0
tip = 0
tax = 0.0675

action = input( "Type amount of meal ")

if action.isdigit():
    meal = (action)
    print (meal)

tips = input(" type the perentage of tip you want to give ")


if tips.isdigit():
    tip = tips 
    print(tip)

I have written this but I do not know how to get

我已经写了这个，但我不知道如何获得

print(tip)

to be a percentage when someone types a number in.

当有人输入数字时为百分比。

回答by merlin2011

Based on your usage of input()rather than raw_input(), I assume you are using python3.

根据您对input()而不是的使用raw_input()，我假设您正在使用python3.

You just need to convert the user input into a floating point number, and divide by 100.

您只需要将用户输入转换为浮点数，然后除以 100。

print ("How much does your meal cost")

meal = 0
tip = 0
tax = 0.0675

action = input( "Type amount of meal ")

if action.isdigit():
    meal = float(action)

tips = input(" type the perentage of tip you want to give ")

if tips.isdigit():
    tip = float(tips)  / 100 * meal
    print(tip)

回答by Corrupted MyStack

It will be

这将是

print "Tip = %.2f%%" % (100*float(tip)/meal)

The end %%prints the percent sign. The number (100*float(tip)/meal)is what you are looking for.

最后%%打印百分号。号码(100*float(tip)/meal)就是你要找的。

回答by Phil Cote

We're assuming that it's a number the user is putting in. We want to make sure that the number is a valid percentage that the program can work with. I would recommend anticipating both expressions of a percentage from the user. So the user might type in .155or 15.5to represent 15.5%. A run-of-the-mill if statement is one way to see to that. (assuming you've already converted to float)

我们假设它是用户输入的数字。我们希望确保该数字是程序可以使用的有效百分比。我建议预测用户对百分比的两种表达方式。因此，用户可能会输入.155或15.5代表 15.5%。普通的 if 语句是实现这一目标的一种方式。（假设您已经转换为浮动）

if tip > 1:
    tip = tip / 100

Alternatively, you could use what's called a ternary expression to handle this case. In your case, it would look something like this:

或者，您可以使用所谓的三元表达式来处理这种情况。在您的情况下，它看起来像这样：

tip = (tip / 100) if tip > 1 else tip

There's another question hereyou could check out to find out more about ternary syntax.

这里还有另一个问题，您可以查看以了解有关三元语法的更多信息。

回答by jfs

>>> "{:.1%}".format(0.88)
'88.0%'