Intro to Python for Data Science Learning 4 - Methods

Methods

 From:https://campus.datacamp.com/courses/intro-to-python-for-data-science/chapter-3-functions-and-packages?ex=6

• String Methods

Strings come with a bunch of methods. Follow the instructions closely to discover some of them. If you want to discover them in more detail, you can always type help(str)

 

# string to experiment with: room
room = "poolhouse"

# Use upper() on room: room_up
room_up = room.upper()

# Print out room and room_up
print(room)
print(room_up)

# Print out the number of o's in room
print(room.count("o"))

 

• List Methods

Strings are not the only Python types that have methods associated with them. Lists, floats, integers and booleans are also types that come packaged with a bunch of useful methods. 

• index(), to get the index of the first element of a list that matches its input and
• count(), to get the number of times an element appears in a list.

# Create list areas
areas = [11.25, 18.0, 20.0, 10.75, 9.50]

# Print out the index of the element 20.0
print(areas.index(20.0))

# Print out how often 14.5 appears in areas
print(areas.count(14.5))

• List Methods (2)

append(), that adds an element to the list it is called on,

remove(), that removes the first element of a list that matches the input, and

reverse(), that reverses the order of the elements in the list it is called on.

 

# Create list areas
areas = [11.25, 18.0, 20.0, 10.75, 9.50]

# Use append twice to add poolhouse and garage size
areas.append(24.5)
areas.append(15.45)

# Print out areas
print(areas)

# Reverse the orders of the elements in areas
areas.reverse()

# Print out areas
print(areas)