如何修改我在python中随机选择的网址

Question

I have an app that will show images from reddit. Some images come like this http://imgur.com/Cuv9oau , when I need to make them look like this http://i.imgur.com/Cuv9oau.jpg . Just add an (i) at the beginning and (.jpg) at the end.

Answer 1

You can use a string replace:

s = "http://imgur.com/Cuv9oau"
s = s.replace("//imgur", "//i.imgur")+(".jpg" if not s.endswith(".jpg") else "")

This sets s to:

'http://i.imgur.com/Cuv9oau.jpg'

Answer 2

This function should do what you need. I expanded on @jh314's response and made the code a little less compact and checked that the url started with http://imgur.com as that code would cause issues with other URLs, like the google search I included. It also only replaces the first instance, which could causes issues.

def fixImgurLinks(url):
    if url.lower().startswith("http://imgur.com"):
        url = url.replace("http://imgur", "http://i.imgur",1) # Only replace the first instance.
        if not url.endswith(".jpg"):
            url +=".jpg"
    return url

for u in ["http://imgur.com/Cuv9oau","http://www.google.com/search?q=http://imgur"]:
    print fixImgurLinks(u)

Gives:

>>> http://i.imgur.com/Cuv9oau.jpg
>>> http://www.google.com/search?q=http://imgur

Answer 3

You should use Python's regular expressions to place the i . As for the .jpg you can just append it .