如何遍历字母表？

Question

In Python, could I simply ++ a char? What is an efficient way of doing this?

I want to iterate through URLs that have the www.website.com/term/#, www.website.com/term/a, www.website.com/term/b, www.website.com/term/c, www.website.com/term/d ... www.website.com/term/z format.

Answer 1

You can use string.ascii_lowercase which is simply a convenience string of lowercase letters,

>>> from string import ascii_lowercase
>>> for c in ascii_lowercase:
...     # append to your url

Answer 2

In addition to string.ascii_lowercase you should also take a look at the ord and chr built-ins. ord('a') will give you the ascii value for 'a' and chr(ord('a')) will give you back the string 'a' .

Using these you can increment and decrement through character codes and convert back and forth easily enough. ASCII table is always a good bookmark to have too.

Answer 3

I cannot comment, so I just want to give a code to @Brian answer. https://stackoverflow.com/a/17182751/1425790

url=www.website.com/term
my_char=ord('a') # convert char to ascii
while my_char<= ord('z'):
   my_char+=1 # iterate over abc
   my_url=url+chr(my_char)  # convert ascii to char
   do_something(my_url)