如何检查两个值之间的变化(百分比)？

Question

我有两个值(先前和当前),我想检查它们之间的变化(百分比):

(current/previous)*100

但如果前一个值为0,我会得到除零,如果值不会改变,我得到100%.

Answer 1

def get_change(current, previous):
    if current == previous:
        return 100.0
    try:
        return (abs(current - previous) / previous) * 100.0
    except ZeroDivisionError:
        return 0

Answer 2

def get_percentage_diff(previous, current):
    try:
        percentage = abs(previous - current)/max(previous, current) * 100
    except ZeroDivisionError:
        percentage = float('inf')
    return percentage

这是我发现的更好的方法。

仅涵盖100% 以下的差异。如果增加超过 100%，则此解决方案失败

Answer 3

您需要将change(current-previous)除以previous,而不仅仅是当前.所以,长话短说:

change_percent = ((float(current)-previous)/previous)*100

请注意,如果previous是,0您无法计算百分比的变化(无论python实现如何)