在Python中，如何遍历此列表并将每个项目调用到同一函数？

Question

Hello I am trying to build a script that will list sites' SSL cert expiration date. The first function of the code def sslExpiresDate works great on its own. It's when I add the second function def all_sites_list where my code has broken. I don't know how to run sslExpiresDate to get an outcome for each URL in the list sites . I have tried to do this by building a second function and calling the first one from it, but it does not work.

I would like the expected outcome to be in a readable table format (but I haven't even gotten that far). Something like:

SITE              EXP DATE
www.site1.com     03-05-18
www.site2.com     08-12-19
www.site3.com     12-12-21

Meanwhile here is the code I'm struggling with. Thanks:

import OpenSSL 
import ssl

sites = ['www.site1.com', 'www.site2.com', 'www.site3.com']

def sslExpiresDate():
    cert = ssl.get_server_certificate((sites, 443)) 
    x509 = OpenSSL.crypto.load_certificate(OpenSSL.crypto.FILETYPE_PEM, cert) 
    print(x509.get_notAfter())
    return

def all_sites_list(sites, sslExpiresDate):
    for site in sites():
        sslExpiresDate(site)
    return

all_sites_list(sites, sslExpiresDate)

Answer 1

The map function allows you to send each value in a sequence to a function producing a sequence of the results. You can the zip this sequence with the original sequence to get a table as you wanted:

import OpenSSL 
import ssl
from datetime import datetime

dateformat = '%Y%m%d%H%M%SZ'

sites = ['www.google.com', 'www.plus.net']

def sslExpiresDate(site):
    cert = ssl.get_server_certificate((site, 443)) 
    x509 = OpenSSL.crypto.load_certificate(OpenSSL.crypto.FILETYPE_PEM, cert) 
    return datetime.strptime(x509.get_notAfter().decode(),dateformat).date().isoformat()


def all_sites_list(sites, sslExpiresDate):
    return list(zip(sites,map(sslExpiresDate,sites)))

tab_format = '{:18s}{:18s}'
print(tab_format.format('SITE','EXP DATE'))
for site in sorted(all_sites_list(sites, sslExpiresDate), key=lambda site: site[1]):
    print(tab_format.format(*site))

gives:

SITE              EXP DATE          
www.google.com    2018-07-10        
www.plus.net      2020-02-27        

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