This Python Set Methods lesson is for a beginner. Read the short notes, run each example, then change one name or number and run it again.
add, discard, remove, union, intersection, and difference are the everyday set methods.
A set drops duplicates and does not keep a reliable order.
Example 1: Start here
discard is quiet when the value is missing. remove is not.
skills = {"Python", "SQL", "Python"} # a dictionary; each key has one value
print(skills)
print(skills.intersection({"SQL", "Git"}))
Example 2: Store the idea in a name
Python Set Methods begins with a value you can point at. The name topic holds that text.
topic = "Python Set Methods" # text
print(topic)
Example 3: Check it with if
An if chooses one branch. Change the score and run it again to see the other message.
score = 19 # a whole number
if score >= 80: # run the indented lines only when this is true
print("Pass")
else: # runs when the test above was false
print("Try again")
Example 4: Repeat with a loop
A for loop runs the indented line once per step. The numbers 1, 2, and 3 are printed on their own lines.
for step in range(1, 4): # repeat once per number; range stops before the last
print("Step", step) # a comma prints each value, with a space between
discard is quiet when the value is missing. remove is not.
