## 3: Interface

### Instructions

The code below assigns the value 5 to the variable b. Add a new line below that assigns 6 to b.

``````

In :

b = 5
b = 6

``````
``````

In :

assert b == 6

``````

### Instructions

``````

In :

# Here's a comment!
b = 5
# Here's another comment! Neither of these comments are evaluated by Python!
# this is my comment

``````

## 5: Print function

### Instructions

Use the print() function to display the value stored in b. Then, use the print() function to display the number 500.

``````

In :

b = 6
print(b)
print(500)

``````
``````

6
500

``````

## 6: Types

### Instructions

Assign the integer value 100 to the variable named hundred_integer. Assign the string value "hundred" to the variable named hundred_string. Assign the float value 100.5 to the variable named hundred_float.

``````

In :

# Integer
i = 1
# String
s = "Hello World"
# Float
f = 55.55

hundred_integer = 100
hundred_string = "hundred"
hundred_float = 100.5

``````
``````

In :

assert hundred_integer == 100

``````

## 7: Type function

### Instructions

Assign the type of 10 to c then use the print() function to display c.

``````

In :

a = type(5)
# The type is assigned to a. When you print the type, it is abbreviated to `str`
print(a)

c = type(10)
print(c)

``````
``````

<class 'int'>
<class 'int'>

``````

## 8: Arithmetic operators

### Instructions

The variable five contains the integer value 5.

Use the arithmetic operators and the variable five to perform calculations that result in 25. Assign to the variable twenty_five.

Use the arithmetic operators and the variable five to perform calculations that result in -5. Assign to the variable negative_five.

``````

In :

five = 5
twenty_five = five * 5
negative_five = -five
assert twenty_five == 25
assert negative_five == -5

``````

## 9: Converting types

### Instructions

The variable eight contains the integer 8 and the variable ten contains the string "10". Convert eight to a string using the str() function and assign to str_eight. Then convert ten to an integer using the int() function and assign to int_ten.

``````

In :

ten = "10"
eight = 8

int_ten = int(ten)
str_eight = str(eight)

``````
``````

In :

assert int_ten == 10
assert str_eight == u"8"

``````

## 11: Lists

### Instructions

Add new code that appends March to the list l, then appends April to the list, then displays that list, l, using the print() function.

``````

In :

l = []

# Print the type of `l` to confirm it's a list.
print(type(l))
l.append("January")
l.append("February")
l.append("March")
l.append("April")
print(l)

``````
``````

<class 'list'>
['January', 'February', 'March', 'April']

``````

## 12: Creating lists with values

### Instructions

Write a single line of code that creates a list years and fills it with the integer values 2010, 2011, 2012, 2013, and 2014, in that order.

``````

In :

l = ["January", "February", "March", "April"]
m = [0,1,2,3]
years = [_ for _ in range(2010, 2015)]
print(years)

``````
``````

[2010, 2011, 2012, 2013, 2014]

``````

## 13: Multiple types in list

### Instructions

Create a list o that contains the following elements, in order:

• "Jan" (string)
• 5.0 (float)
• 1.0 (float)
• "uary" (string)
• 10 (integer)
``````

In :

o = [u"Jan", 5., 1., u"uary", 10]

``````
``````

In :

print(o)

``````
``````

['Jan', 5.0, 1.0, 'uary', 10]

``````

## 14: List index

### Instructions

The list int_months contains the values 1 to 12. Select the value at index 4 and assign to the variable index_four. Then select the last value in the list and assign to last_value.

``````

In :

int_months = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12]
index_four = int_months
last_value = int_months[-1]

``````

## 15: List length

### Instructions

Retrieve the second to last element from the list months and assign it to second_last. Then use the print() function to display second_last.

``````

In :

months = ["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov"]
second_last = months[-2]

``````

## 16: List slicing

### Instructions

Use slicing to return a list named five_nine that contains the values from index 5 to index 9 (including the value at index 9). Then use the print() function to display the first 5 elements in months.

``````

In :

months = ["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sept", "Oct", "Nov", "Dec"]
eight_eleven = months[8:12]
ending_index = len(months)
eight_eleven = months[8:ending_index]

five_nine = months[5:10]
print(months[:5])

``````
``````

['Jan', 'Feb', 'Mar', 'Apr', 'May']

``````
``````

In [ ]:

``````