hyperskill links. Utm tags added

Author: zoyakostyreva

Classes and objects/Call a method from another method/task.md

@@ -4,4 +4,4 @@ As we discussed before, methods may call other methods by using method attribute
 Use this knowledge to complete the `exponentiate` method of the `Calculator` class. It should
 call the `multiply` method to calculate the result.
 
-For more structured and detailed information, you can refer to [this Hyperskill knowledge base page](https://hyperskill.org/learn/step/6931).
+For more structured and detailed information, you can refer to [this Hyperskill knowledge base page](https://hyperskill.org/learn/step/6931?utm_source=jba&utm_medium=jba_courses_links).

Classes and objects/Class and Instance Variables 2/task.md

@@ -9,4 +9,4 @@ Implement the method `add_city` that will append a city name to the `all_cities`
 
 In the `__init__` method, call the `add_city` method to add the city name to the list upon object initialization.
 
-For more structured and detailed information, you can refer to [this Hyperskill knowledge base page](https://hyperskill.org/learn/step/6981).
+For more structured and detailed information, you can refer to [this Hyperskill knowledge base page](https://hyperskill.org/learn/step/6981?utm_source=jba&utm_medium=jba_courses_links).

Classes and objects/Class and Instance Variables/task.md

@@ -36,7 +36,7 @@ one object, it will be changed for all objects of the class (check out the examp
 editor – see what `print(barsik.favorite_food)` will print). If you intend using a list to keep track 
 of features unique to each instance, you need to make it an instance attribute.
 
-For more structured and detailed information, you can refer to [this Hyperskill knowledge base page](https://hyperskill.org/learn/step/6677).
+For more structured and detailed information, you can refer to [this Hyperskill knowledge base page](https://hyperskill.org/learn/step/6677?utm_source=jba&utm_medium=jba_courses_links).
 
 ### Task
 In the code editor, complete the implementation of the `Animals` class so that the `print` statement 

Classes and objects/Definition/task.md

@@ -43,7 +43,7 @@ variable `x`.
 You can find out more about class definition syntax by reading <a href="https://docs.python.org/3/tutorial/classes.html#class-definition-syntax">this section</a>
 of Python Documentation.
 
-For more structured and detailed information, you can also refer to [this Hyperskill knowledge base page](https://hyperskill.org/learn/step/6661).
+For more structured and detailed information, you can also refer to [this Hyperskill knowledge base page](https://hyperskill.org/learn/step/6661?utm_source=jba&utm_medium=jba_courses_links).
 
 ### Task
 Assign a value to  `variable` inside `MyClass` and create an object `my_class` of the class `MyClass()`. 

Classes and objects/Special __init__ method/task.md

@@ -36,7 +36,7 @@ x.num
 (3-4.5j)
 ```
 
-For more structured and detailed information, you can refer to [this Hyperskill knowledge base page](https://hyperskill.org/learn/step/6669#def-__init).
+For more structured and detailed information, you can refer to [this Hyperskill knowledge base page](https://hyperskill.org/learn/step/6669#def-__init?utm_source=jba&utm_medium=jba_courses_links).
 
 ### Task
 In the code editor, add parameters to the`__init__()` method of the `Car` class, so we can 

Classes and objects/The self parameter/task.md

@@ -22,7 +22,7 @@ class Bag:
         self.add(x)
 ```
 
-For more structured and detailed information, you can refer to [this Hyperskill knowledge base page](https://hyperskill.org/learn/step/6669#self).
+For more structured and detailed information, you can refer to [this Hyperskill knowledge base page](https://hyperskill.org/learn/step/6669#self?utm_source=jba&utm_medium=jba_courses_links).
 
 ### Task
 In the code editor, implement the `add` method of the `Calculator` class. It should 

Classes and objects/Update variable/task.md

@@ -4,7 +4,7 @@ In this exercise, create a new `Car` object `car2` and then set `color`
 of `car2` to `"red"`. Print the descriptions of `car1` and `car2` by calling the 
 `description` method.
 
-For more structured and detailed information, you can refer to [this Hyperskill knowledge base page](https://hyperskill.org/learn/step/6677#changing-attributes).
+For more structured and detailed information, you can refer to [this Hyperskill knowledge base page](https://hyperskill.org/learn/step/6677#changing-attributes?utm_source=jba&utm_medium=jba_courses_links).
 
 <div class='hint'>Remember how we instantiated objects in the previous task by 
 "calling" the class.</div>

Classes and objects/Variable access/task.md

@@ -17,7 +17,7 @@ then `MyClass.year` and `MyClass.say_hello` are valid attribute references retur
 integer and a function object, respectively. Class attributes can be 
 assigned to, so you can change the value of `MyClass.year` by assignment.
 
-For more structured and detailed information, you can refer to [this Hyperskill knowledge base page](https://hyperskill.org/learn/step/6661#class-attribute).
+For more structured and detailed information, you can refer to [this Hyperskill knowledge base page](https://hyperskill.org/learn/step/6661#class-attribute?utm_source=jba&utm_medium=jba_courses_links).
 
 ### Task
 Check out our example and print the value of `variable1` from `my_object`.  

Classes and objects/__str__ vs __repr__/task.md

@@ -27,7 +27,7 @@ Also, if we think it would be useful to have a string representation for users,
 a `__str__` function. Check out another implementation of the class `Complex` in the code editor. Run the code
 to see what each of the two `print` statements prints.
 
-For more structured and detailed information, you can refer to [this Hyperskill knowledge base page](https://hyperskill.org/learn/step/7139#str__-vs-__repr).
+For more structured and detailed information, you can refer to [this Hyperskill knowledge base page](https://hyperskill.org/learn/step/7139#str__-vs-__repr?utm_source=jba&utm_medium=jba_courses_links).
 
 ### Task
 Implement `__str__` and `__repr__` methods for the class `Cat`. `__str__` method should return a string like this:

Condition expressions/Boolean operators order/task.md

@@ -3,7 +3,7 @@
 Boolean operators are not evaluated from left to right. There's an order of operations for 
 boolean operators: `not` is evaluated first, `and` is evaluated next, and `or` is evaluated last.  
 
-For more structured and detailed information, you can refer to [this Hyperskill knowledge base page](https://hyperskill.org/learn/step/6025).
+For more structured and detailed information, you can refer to [this Hyperskill knowledge base page](https://hyperskill.org/learn/step/6025?utm_source=jba&utm_medium=jba_courses_links).
 
 ### Task
 Write an expression that evaluates to `True` if `name` is either `"John"` or `"Jane"` who are `16` or older, but younger than `25`.