如何在python中计算百分比
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how to calculate percentage in python
提问by
This is my program
这是我的程序
print" Welcome to NLC Boys Hr. Sec. School "
a=input("\nEnter the Tamil marks :")
b=input("\nEnter the English marks :")
c=input("\nEnter the Maths marks :")
d=input("\nEnter the Science marks :")
e=input("\nEnter the Social science marks :")
tota=a+b+c+d+e
print"Total is: ", tota
per=float(tota)*(100/500)
print "Percentage is: ",per
Result
结果
Welcome to NLC Boys Hr. Sec. School
Enter the Tamil marks :78
Enter the English marks :98
Enter the Maths marks :56
Enter the Science marks :65
Enter the Social science marks :78 Total is: 375 Percentage is: 0.0
However, the percentage result is 0. How do I calculate the percentage correctly in Python?
但是，百分比结果是0。如何在 Python 中正确计算百分比？
采纳答案by JJGuerrero
I guess you're learning how to Python. The other answers are right. But I am going to answer your main question: "how to calculate percentage in python"
我猜你正在学习如何使用 Python。其他答案都对。但我要回答你的主要问题：“如何在 python 中计算百分比”
Although it works the way you did it, it doesn′t look very pythonic. Also, what happens if you need to add a new subject? You'll have to add another variable, use another input, etc. I guess you want the average of all marks, so you will also have to modify the count of the subjects everytime you add a new one! Seems a mess...
虽然它按照你的方式工作，但它看起来不是很 Pythonic。另外，如果您需要添加新主题会怎样？您必须添加另一个变量，使用另一个输入等。我猜您想要所有分数的平均值，因此每次添加新主题时，您还必须修改主题的数量！好像乱七八糟...
I′ll throw a piece of code where the only thing you'll have to do is to add the name of the new subject in a list. If you try to understand this simple piece of code, your Python coding skills will experiment a little bump.
我将抛出一段代码，您唯一需要做的就是在列表中添加新主题的名称。如果你试图理解这段简单的代码，你的 Python 编码技能将会经历一些小插曲。
#!/usr/local/bin/python2.7
marks = {} #a dictionary, it's a list of (key : value) pairs (eg. "Maths" : 34)
subjects = ["Tamil","English","Maths","Science","Social"] # this is a list
#here we populate the dictionary with the marks for every subject
for subject in subjects:
marks[subject] = input("Enter the " + subject + " marks: ")
#and finally the calculation of the total and the average
total = sum(marks.itervalues())
average = float(total) / len(marks)
print ("The total is " + str(total) + " and the average is " + str(average))
Hereyou can test the code and experiment with it.
您可以在此处测试代码并对其进行试验。
回答by Paulo Bu
You're performing an integer division. Append a .0to the number literals:
您正在执行整数除法。将 a 附加.0到数字文字：
per=float(tota)*(100.0/500.0)
In Python 2.7 the division 100/500==0.
在 Python 2.7 中，除法100/500==0.
As pointed out by @unwind, the float()call is superfluous since a multiplication/division by a float returns a float:
正如@unwind 所指出的，这个float()调用是多余的，因为一个浮点数的乘法/除法返回一个浮点数：
per= tota*100.0 / 500
回答by unwind
This is because (100/500)is an integer expression yielding 0.
这是因为(100/500)是一个产生 0 的整数表达式。
Try
尝试
per = 100.0 * tota / 500
there's no need for the float()call, since using a floating-point literal (100.0) will make the entire expression floating-point anyway.
不需要float()调用，因为使用浮点文字 ( 100.0) 无论如何都会使整个表达式成为浮点。
回答by DigitalGeek
marks = raw_input('Enter your Obtain marks:')
outof = raw_input('Enter Out of marks:')
marks = int(marks)
outof = int(outof)
per = marks*100/outof
print 'Your Percentage is:'+str(per)
Note : raw_input() function is used to take input from console and its return string formatted value. So we need to convert into integer otherwise it give error of conversion.
注意：raw_input() 函数用于从控制台获取输入及其返回字符串格式的值。所以我们需要转换成整数，否则会产生转换错误。
回答by sridhar
Percent calculation that worked for me:
对我有用的百分比计算：
(new_num - old_num) / old_num * 100.0
回答by Mr. Code
I know I am late, but if you want to know the easiest way, you could do a code like this:
我知道我迟到了，但如果你想知道最简单的方法，你可以做这样的代码：
number = 100
right_questions = 1
control = 100
c = control / number
cc = right_questions * c
print float(cc)
You can change up the number score, and right_questions. It will tell you the percent.
您可以更改数字分数和 right_questions。它会告诉你百分比。
回答by Yash Shukla
def percentage_match(mainvalue,comparevalue):
if mainvalue >= comparevalue:
matched_less = mainvalue - comparevalue
no_percentage_matched = 100 - matched_less*100.0/mainvalue
no_percentage_matched = str(no_percentage_matched) + ' %'
return no_percentage_matched
else:
print('please checkout your value')
print percentage_match(100,10)
Ans = 10.0 %
