diff --git a/source/week-1/conditions/multilpe-conditions/or_statements.py b/source/week-1/conditions/multilpe-conditions/or_statements.py
index 5e80934..e3f9b5c 100644
--- a/source/week-1/conditions/multilpe-conditions/or_statements.py
+++ b/source/week-1/conditions/multilpe-conditions/or_statements.py
@@ -1,10 +1,9 @@
 province = input("What province do you live in? ")
 tax = 0
-if province == 'Alberta' \
-   or province == 'Nunavut':
-	tax = 0.05
-elif province == 'Ontario':
-	tax = 0.13
+if province == "Alberta" or province == "Nunavut":
+    tax = 0.05
+elif province == "Ontario":
+    tax = 0.13
 else:
-	tax = 0.15
+    tax = 0.15
 print(tax)
diff --git a/source/week-1/conditions/single/code_challenge.py b/source/week-1/conditions/single/code_challenge.py
index 4d1a515..9fe84df 100644
--- a/source/week-1/conditions/single/code_challenge.py
+++ b/source/week-1/conditions/single/code_challenge.py
@@ -7,6 +7,6 @@
 if price > 1.00:
 	tax = .07
 	print('Tax rate is: ' + str(tax))
-else
+else:
 	tax = 0
 print('Tax rate is: ' + str(tax))
\ No newline at end of file
diff --git a/source/week-1/dates/format_date.py b/source/week-1/dates/format_date.py
index 031cf2b..49baaf4 100644
--- a/source/week-1/dates/format_date.py
+++ b/source/week-1/dates/format_date.py
@@ -8,10 +8,15 @@
 # to display only part of the date
 # All these functions return integers
 # Convert them to strings before concatenating them to another string
-print('Day: ' + str(today.day))
+print('Date: ' + str(today.day))
 print('Month: ' + str(today.month))
 print('Year: ' + str(today.year))
 
 print('Hour: ' + str(today.hour))
 print('Minute: ' + str(today.minute))
 print('Second: ' + str(today.second))
+
+# Using the strftime() Method
+print("DD/MM/YY: " + str(today.strftime('%d/%m/%y')))
+print("DD Month YYYY: " + str(today.strftime('%d %B %Y')))
+print("MM/DD/YYYY, H:M:S : " + str(today.strftime("%m/%d/%Y, %H:%M:%S")))
diff --git a/source/week-1/error-handling/runtime.py b/source/week-1/error-handling/runtime.py
index 33bfd3d..363312b 100644
--- a/source/week-1/error-handling/runtime.py
+++ b/source/week-1/error-handling/runtime.py
@@ -1,11 +1,21 @@
-x = 42
-y = 0
+# Error Handling
 try:
-    print(x / y)
-except ZeroDivisionError as e:
-    # Optionally, log e somewhere
-    print('Sorry, something went wrong')
+    print(x)
+except NameError:
+    print("Variable x is not defined")
 except:
-    print('Something really went wrong')
+    print("Something else went wrong")
 finally:
     print('This always runs on success or failure')
+
+# Use while to create an infinite loop that will run
+# # until false is returned (correct input in this case)
+while True:
+    try:
+        x = int(input("Please enter a number: "))
+        break
+    except ValueError:
+        print("Oops!  That was no valid number.  Try again...")
+
+# Instead of letting python to shout at the user "ValueError"
+# we catch the anticipated error and display a polite message
\ No newline at end of file
diff --git a/source/week-1/error-handling/syntax.py b/source/week-1/error-handling/syntax.py
index 2f11395..d9c8e32 100644
--- a/source/week-1/error-handling/syntax.py
+++ b/source/week-1/error-handling/syntax.py
@@ -1,4 +1,4 @@
 x = 42
 y = 206
-if x == y
-    print('Success')
\ No newline at end of file
+if x == y:
+    print("Success")
diff --git a/source/week-1/variables/string-variables/f_strings.py b/source/week-1/variables/string-variables/f_strings.py
new file mode 100644
index 0000000..1ae259f
--- /dev/null
+++ b/source/week-1/variables/string-variables/f_strings.py
@@ -0,0 +1,12 @@
+# Only available for python 3.6+
+# This new way of formatting strings lets you 
+# use embedded Python expressions inside string constants.
+
+name = input("What is your name? ")
+subject = input("What subject do you like? ")
+print(f"{name}'s favorite subject is {subject}.")
+
+a = 5
+b = 10
+sum = a + b
+print(f'{a} plus {b} is equal to {sum}.')