如何在 if... else... 语句中使用 python 正则表达式? [英] How to use python regular expression inside if... else... statement?

问题描述

我的 Python 脚本:

My Python script:

import wget

if windowsbit == x86:
    url = 'http://test.com/test_windows_2_56_30-STEST.exe'
    filename = wget.download(url)
else:
    url = 'http://test.com/test_windows-x64_2_56_30-STEST.exe'
    filename = wget.download(url)

在上面的 python 脚本中，我使用 wget 模块下载基于 Windows 32 位或 64 位的文件格式 URL.它按预期工作.

In above python script, I am using wget module to download a file form URL, based on windows 32 bit or 64 bit. Its working as expected.

我想用正则表达式做以下事情:

I want to use regular expression to do the following:

如果windowsbit == x86，它应该下载以test_windows开头并以STEST.exe结尾的文件.否则它应该下载以 test_windows-x64 开头并以 STEST.exe 结尾的文件.

if windowsbit == x86, its should download the file that starting with test_windows and ends with STEST.exe file. else its should download file that starting with test_windows-x64 and ends with STEST.exe file.

我是 python 新手，我不知道如何做到这一点.有人可以指导我吗?

I am new to python, I not getting any idea on how to do this. Could any one guide me on this?

推荐答案

这看起来不可能.与您要执行的操作相匹配的正则表达式类似于:

This doesn't look possible. The regular expression that would match what you're trying to do is something like:

import re

urlre = re.compile("""
    http://test.com/test_windows    # base URL
    (?P<bit>-x64)?                  # captures -x64 if present
    _(?P<version_major>\d+)         # captures major version
    _(?P<version_minor>\d+)         # captures minor version
    _(?P<version_revision>\d+)      # captures revision version
    -STEST.exe                      # ending filename""", re.X)

然而，你不能把它扔到 wget 中.您不能在请求中使用通配符——网络服务器必须知道如何处理它们，而它不知道.更好的方法可能是:

However you can't just throw that in wget. You can't use wildcards in requests -- the webserver would have to know how to process them and it doesn't. A better method might be:

base_url = "http://test.com/test_windows"
if windowsbit == x64:
    base_url += "-x64"
version = "2_56_30"
filename = "STEST.exe"

final_url = "{base}_{version}-{filename}".format(
    base=base_url, version=version, filename=filename)

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