fixes

basics/answers.md

@@ -66,7 +66,7 @@ isn't exactly like mine but it works just fine it's ok, and you can
     ```python
     no_space = input("Enter a word: ")
     yes_space = no_space + " "
-    print(yes_space * 999 + no_space)
+    print(yes_space*999 + no_space)
     ```
 
 5. Like this:
@@ -79,21 +79,20 @@ isn't exactly like mine but it works just fine it's ok, and you can
     ```
 
 6. We can compare the word against an empty string (`""` or `''`) to
-    check if it's empty. In this example, the password is "s3cr3t".
+    check if it's empty. In this example, the password is "seKr3t".
 
     ```python
     word = input("Enter your password: ")
 
-    if word == "s3cr3t":
+    if word == "seKr3t":
         print("Welcome!")
     elif word == "":
         print("You didn't enter anything.")
     else:
         print("Access denied.")
     ```
 
-    This is not a good way to ask a password from the user because the
-    password isn't hidden in any way, but this is just an example.
+    Again, this is not a good way to ask a real password from the user.
 
 ## Handy stuff: Strings
 
@@ -219,7 +218,8 @@ isn't exactly like mine but it works just fine it's ok, and you can
     problems and solutions:
 
     - `namelist` is None. It should be `namelist.extend('theelous3')`,
-        not `namelist = namelist.extend('theelous3')`.
+        not `namelist = namelist.extend('theelous3')`. See [this
+        thing](using-functions.md#return-values).
     - Now the namelist is like `['wub_wub', ..., 't', 'h', 'e', 'e', ...]`.
         Python treated `'theelous3'` like a list so it added each of its
         characters to `namelist`. We can use `namelist.append('theelous3')`

basics/defining-functions.md

@@ -177,20 +177,16 @@ However, modifying a global variable in-place from a function is easy.
 >>>
 ```
 
-This doesn't work if the value is of an immutable type, like string or
-integer because immutable values cannot be modified in-place.
-Fortunately, Python will tell us if something's wrong.
+This only works for changing in-place, we cannot assign a new value to
+the variable.
 
 ```python
->>> thing = 1
->>> def stuff():
-...     thing += 1
+>>> def set_stuff_to_something_new():
+...     stuff = ['more local stuff']
 ...
->>> stuff()
-Traceback (most recent call last):
-  File "<stdin>", line 1, in <module>
-  File "<stdin>", line 2, in stuff
-UnboundLocalError: local variable 'thing' referenced before assignment
+>>> set_stuff_to_something_new()
+>>> stuff
+['global stuff', 'local stuff']
 >>>
 ```
 
@@ -262,10 +258,6 @@ This function can be called in two ways:
     because `message = "hi"` and `some_function(message="hi")` do two
     completely different things.
 
-Personally, I would use this function with a positional argument. It
-only takes one argument, so I don't need to worry about which argument
-is which.
-
 Now it's time to solve our box printing problem:
 
 ```python

getting-help.md

@@ -5,7 +5,7 @@ places to ask for help in.
 
 ## IRC
 
-IRC is the oldest chatting service I know, but as of 2017, it's still
+IRC is the oldest chatting service I know, but as of 2018, it's still
 in use, and a great way to get help in Python. You don't need to
 register anywhere, just click one of the links below and you're good to
 go.