Support reading passwords from standard input

README.md

@@ -3,6 +3,13 @@ Pwned Password API lookup
 
 Usage:
 
-python pwned.py [password]
+* `python pwned.py` – reads passwords from standard input;
+* `pytohn pwned.py <[file-with-passwords]` – reads passwords from
+  a file;
+* `another-command | pytohn pwned.py <[file-with-passwords]` – reads
+  passwords written to standard output by another command;
+* `python pwned.py [password]` – checks passwords given as command line
+  arguments (beware the password may be saved in shell history and that
+  other users on the system ma be able to observe the command line).
 
 Have fun! Oh, and if you find one of your own passwords, change it asap!

pwned.py

@@ -18,7 +18,8 @@ def lookup_pwned_api(pwd):
 
 
 def main(args):
-    for pwd in args:
+    for pwd in args or sys.stdin:
+        pwd = pwd.strip()
         api_return = lookup_pwned_api(pwd)
         if (api_return):
             print(pwd, "was found")