在列表中查找最新版本 [英] Finding the latest version in a list

问题描述

我能够在文件夹中搜索所有版本日志行，但是我试图选择列表中的最新版本，但是我不知道怎么做，因为列表中的元素同时包含字符和数字.

I'm able to search through a folder to all the version log lines, but I am trying to select the newest version in the list, but I don't know how because the elements of the list contains both characters and numbers.

下面是我的代码，用于查找和创建一个名为matched_lines的列表，其中包含说明日志版本号的所有行.我希望从创建的此列表中找到最新版本，并将此最新版本与日志外部的实际最新版本进行比较.例如，生成的列表将包含:

Below is my code for find and creating a list called matched_lines that contains all the lines that states the version number of the log. I hope to find the newest version from this list created, and compare this newest version with the actual latest version outside of the log. For example, a generated list would consist:

['版本2.13.1.1'，'版本2.12.1.0'，'版本2.10.1.4']

['Version 2.13.1.1', 'Version 2.12.1.0', 'Version 2.10.1.4']

在此示例中，我希望选择版本2.13.1.1"，并将其与日志的最新版本号进行比较，例如版本2.14.1.0".

In this example, I would hope to select "Version 2.13.1.1", and compare this with the latest version number the log, for example, "Version 2.14.1.0".

    for filename in files:

            #print('start parsing... ' + str(datetime.datetime.now()))
            matched_line = []
            try:
                with open(filename, 'r', encoding = 'utf-8') as f:
                    f = f.readlines()
            except:
                with open(filename, 'r') as f:
                    f = f.readlines()                 

            # print('Finished parsing... ' + str(datetime.datetime.now()))

            for line in f:
                #0strip out \x00 from read content, in case it's encoded differently
                line = line.replace('\x00', '')

                #regular expressions to fidn the version log lines for each type
                RE1 = r'^Version \d.\d+.\d.\d' #Sample regular expression

                pattern2 = re.compile('('+RE1+')', re.IGNORECASE)

                #for loop that matches all the available version log lines
                for match2 in pattern2.finditer(line):
                    matched_line.append(line)

在此列表中找到最新版本后，我希望将其与文件夹之外的实际最新版本号进行比较.

After finding the newest version in this list, I hope to then compare it with the actual latest version number that may be outside of the folder.

推荐答案

首先，您需要从字符串中捕获版本号，并将其转换为 int 的 tuple 格式为(主要，次要，微型).将其用作 max 函数的 key 将返回最新版本.

First you need to capture the version number from the string and turn it into a tuple of int of the form (major, minor, micro). Using this as key for the max function will return the latest version.

import re

def major_minor_micro(version):
    major, minor, micro = re.search('(\d+)\.(\d+)\.(\d+)', version).groups()

    return int(major), int(minor), int(micro)

示例

versions = ['Version 2.13.1.1', 'Version 2.12.1.0', 'Version 2.10.1.4']
latest = max(versions, key=major_minor_micro)

print(latest) # 'Version 2.13.1.1'

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