Update password_generator.py (#7745)

* Update password_generator.py

1. Use secrets module instead of random for passwords as it gives a secure source of randomness
2. Add type annotations for functions
3. Replace ctbi (variable for the characters to be included) with a more meaningful and short name
4. Use integer division instead of obtaining the integer part of a division computing a floating point

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other/password_generator.py

@@ -1,9 +1,10 @@
 """Password Generator allows you to generate a random password of length N."""
-from random import choice, shuffle
+import secrets
+from random import shuffle
 from string import ascii_letters, digits, punctuation
 
 
-def password_generator(length=8):
+def password_generator(length: int = 8) -> str:
     """
     >>> len(password_generator())
     8
@@ -17,58 +18,59 @@ def password_generator(length=8):
     0
     """
     chars = ascii_letters + digits + punctuation
-    return "".join(choice(chars) for x in range(length))
+    return "".join(secrets.choice(chars) for _ in range(length))
 
 
 # ALTERNATIVE METHODS
-# ctbi= characters that must be in password
+# chars_incl= characters that must be in password
 # i= how many letters or characters the password length will be
-def alternative_password_generator(ctbi, i):
+def alternative_password_generator(chars_incl: str, i: int) -> str:
     # Password Generator = full boot with random_number, random_letters, and
     # random_character FUNCTIONS
     # Put your code here...
-    i = i - len(ctbi)
-    quotient = int(i / 3)
+    i -= len(chars_incl)
+    quotient = i // 3
     remainder = i % 3
-    # chars = ctbi + random_letters(ascii_letters, i / 3 + remainder) +
+    # chars = chars_incl + random_letters(ascii_letters, i / 3 + remainder) +
     #     random_number(digits, i / 3) + random_characters(punctuation, i / 3)
     chars = (
-        ctbi
+        chars_incl
         + random(ascii_letters, quotient + remainder)
         + random(digits, quotient)
         + random(punctuation, quotient)
     )
-    chars = list(chars)
-    shuffle(chars)
-    return "".join(chars)
+    list_of_chars = list(chars)
+    shuffle(list_of_chars)
+    return "".join(list_of_chars)
 
     # random is a generalised function for letters, characters and numbers
 
 
-def random(ctbi, i):
-    return "".join(choice(ctbi) for x in range(i))
+def random(chars_incl: str, i: int) -> str:
+    return "".join(secrets.choice(chars_incl) for _ in range(i))
 
 
-def random_number(ctbi, i):
+def random_number(chars_incl, i):
     pass  # Put your code here...
 
 
-def random_letters(ctbi, i):
+def random_letters(chars_incl, i):
     pass  # Put your code here...
 
 
-def random_characters(ctbi, i):
+def random_characters(chars_incl, i):
     pass  # Put your code here...
 
 
 def main():
     length = int(input("Please indicate the max length of your password: ").strip())
-    ctbi = input(
+    chars_incl = input(
         "Please indicate the characters that must be in your password: "
     ).strip()
     print("Password generated:", password_generator(length))
     print(
-        "Alternative Password generated:", alternative_password_generator(ctbi, length)
+        "Alternative Password generated:",
+        alternative_password_generator(chars_incl, length),
     )
     print("[If you are thinking of using this passsword, You better save it.]")